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Corrosion behavior of 2195 and 1420 Al-Li alloys in neutral 3.5% NaCl solution under tensile stress 被引量:10
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作者 李劲风 陈文敬 +2 位作者 赵旭山 任文达 郑子樵 《中国有色金属学会会刊:英文版》 CSCD 2006年第5期1171-1177,共7页
The corrosion behaviors of 1420 and 2195 Al-Li alloys under 308 and 490 MPa tensile stress respectively in neutral 3.5% NaCl solution were investigated using electrochemical impedance spectroscopy(EIS) and scanning el... The corrosion behaviors of 1420 and 2195 Al-Li alloys under 308 and 490 MPa tensile stress respectively in neutral 3.5% NaCl solution were investigated using electrochemical impedance spectroscopy(EIS) and scanning electron microscope(SEM). It is found that the unstressed 1420 alloy is featured with large and discrete pits, while general corrosion and localized corrosion including intergranular corrosion and pitting corrosion occur on the unstressed 2195 alloy. As stress is applied to 1420 alloy, the pit becomes denser and its size is decreased. While, for the stressed 2195 alloy, intergranular corrosion is greatly aggravated and severe general corrosion is developed from connected pits. The EIS analysis shows that more severe general corrosion and localized corrosion occur on the stressed 2195 Al-Li alloy than on 1420 Al-Li alloy. It is suggested that tensile stress has greater effect on the corrosion of 2195 Al-Li alloy than on 1420 Al-Li alloy. 展开更多
关键词 al-li合金 铝合金 腐蚀 张应力 NACL溶液
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高强耐蚀1420Al-Li/Mg-9Li/1420Al-Li复合板制备及力学性能
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作者 吴世松 边丽萍 +4 位作者 刘先文 于培文 刘江林 梁伟 张红芳 《热加工工艺》 北大核心 2024年第17期98-100,共3页
采用高强耐蚀超轻1420 Al-Li合金作为覆板,通过一道次热轧制备了1420Al-Li/Mg-9Li/1420Al-Li复合板,研究了不同压下量、450℃热轧复合板界面的微观组织和力学性能。结果表明:当轧制压下量为35%时,复合板仅为部分结合—机械结合+冶金结合... 采用高强耐蚀超轻1420 Al-Li合金作为覆板,通过一道次热轧制备了1420Al-Li/Mg-9Li/1420Al-Li复合板,研究了不同压下量、450℃热轧复合板界面的微观组织和力学性能。结果表明:当轧制压下量为35%时,复合板仅为部分结合—机械结合+冶金结合,界面无化合物生成,复合板的抗拉强度为236 MPa,伸长率为26%;当轧制压下量为50%时,复合板实现完全冶金结合,无界面化合物生成,复合板的抗拉强度高达272 MPa,伸长率为14%,在提高抗腐蚀性的同时,大幅提高了Mg-9Li合金的强度。 展开更多
关键词 Mg-9Li 1420al-li 复合板 轧制复合
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Role of alloying and heat treatment on microstructure and mechanical properties of cast Al-Li alloys:A review
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作者 Guo-hua Wu You-jie Guo +4 位作者 Fang-zhou Qi Shen Zhang Yi-xiao Wang Xin Tong Liang Zhang 《China Foundry》 SCIE EI CAS CSCD 2024年第5期445-460,共16页
Due to the prominent advantages of low density,high elastic modulus,high specific strength and specific stiffness,cast Al-Li alloys are suitable metallic materials for manufacturing complex large-sized components and ... Due to the prominent advantages of low density,high elastic modulus,high specific strength and specific stiffness,cast Al-Li alloys are suitable metallic materials for manufacturing complex large-sized components and are ideal structural materials for aerospace,defense and military industries.On the basis of the microstructural characteristics of cast Al-Li alloys,exploring the role of alloying and micro-alloying can stabilize their dominant position and further expand their application scope.In this review,the development progress of cast Al-Li alloys was summarized comprehensively.According to the latest research highlights,the influence of alloying and heat treatment on the microstructure and mechanical properties was systematically analyzed.The potential methods to improve the alloy performance were concluded.In response to the practical engineering requirements of cast Al-Li alloys,the scientific challenges and future research directions were discussed and prospected. 展开更多
关键词 cast al-li alloy ALLOYING microstructure mechanical properties heat treatment
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Predict the evolution of mechanical property of Al-Li alloys in a marine environment
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作者 Wei Li Lin Xiang +6 位作者 Guang Wu Hongli Si Jinyan Chen Yiming Jin Yan Su Jianquan Tao Chunyang Huang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第1期557-566,共10页
The ocean is one of the essential fields of national defense in the future,and more and more attention is paid to the lightweight research of Marine equipment and materials.This study it is to develop a Machine learni... The ocean is one of the essential fields of national defense in the future,and more and more attention is paid to the lightweight research of Marine equipment and materials.This study it is to develop a Machine learning(ML)-based prediction method to study the evolution of the mechanical properties of Al-Li alloys in the marine environment.We obtained the mechanical properties of Al-Li alloy samples under uniaxial tensile deformation at different exposure times through Marine exposure experiments.We obtained the strain evolution by digital image correlation(DIC).The strain field images are voxelized using 2D-Convolutional Neural Networks(CNN)autoencoders as input data for Long Short-Term Memory(LSTM)neural networks.Then,the output data of LSTM neural networks combined with corrosion features were input into the Back Propagation(BP)neural network to predict the mechanical properties of Al-Li alloys.The main conclusions are as follows:1.The variation law of mechanical properties of2297-T8 in the Marine atmosphere is revealed.With the increase in outdoor exposure test time,the tensile elastic model of 2297-T8 changes slowly,within 10%,and the tensile yield stress changes significantly,with a maximum attenuation of 23.6%.2.The prediction model can predict the strain evolution and mechanical response simultaneously with an error of less than 5%.3.This study shows that a CNN/LSTM system based on machine learning can be built to capture the corrosion characteristics of Marine exposure experiments.The results show that the relationship between corrosion characteristics and mechanical response can be predicted without considering the microstructure evolution of metal materials. 展开更多
关键词 Marine environment al-li alloy Machine learning CORROSION
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Characterization of localized corrosion pathways in 2195-T8 Al-Li alloys exposed to acidic solution 被引量:4
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作者 De-jun Liu Gan Tian +2 位作者 Guo-feng Jin Wei Zhang You-hong Zhang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第7期152-165,共14页
The corrosion properties of aluminum-lithium(Al-Li) alloys, which are potential materials used to construct for tanks of liquid rockets or missiles, are essential for safe propellant storage and transport. In order to... The corrosion properties of aluminum-lithium(Al-Li) alloys, which are potential materials used to construct for tanks of liquid rockets or missiles, are essential for safe propellant storage and transport. In order to manifest the corrosion resistance of the 2195 Al-Li alloy in practical propellant tanks filled with N2O4, the alloy was soaked in 30% nitric acid solution, an accelerating corrosion environment, to test its corrosion behavior. Scanning electron microscopy(SEM) and transmission electron microscopy(TEM)were used to characterize microstructure and corrosion morphology of the alloy. Focused ion beam(FIB),combined with SEM, was used to demonstrate localized corrosion features and the propagation of corrosion pathways beneath the alloy surface. It was found that the corrosion network was formed with most intergranular corrosion and sparse intragranular corrosion. Additionally, the distribution and number of intermetallic particles influenced the localized corrosion degree and the direction of corrosion pathways. Aggregated particles made corrosion pathways continuously and caused more severe corrosion. The results from this work were valid and useful to corrosion prevention and protection for storage safety on propellant tanks in N_(2)O_(4). 展开更多
关键词 al-li alloy Corrosion behavior Corrosion features Immersion test Intermetallic particles
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EFFECTS OF IMPURITIES AND RARE EARTH ADDITION ON THE TOUGHENING LEVELS OF Al-Li BASED ALLOYS 2090 AND 1420
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作者 L.Meng T.P.Tu +1 位作者 Y.Z.Yang M.S.Liu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1998年第3期163-168,共6页
The effects of the impurities Fe, Si, Na, K and a rare earth addition, Ce, on the intrinsic and extrinsic toughening levels have been investigated for the Al-Li based alloys 2090 and 1420. 29K reduction in the toughen... The effects of the impurities Fe, Si, Na, K and a rare earth addition, Ce, on the intrinsic and extrinsic toughening levels have been investigated for the Al-Li based alloys 2090 and 1420. 29K reduction in the toughening level for the alloy 2090 with impurities 0.42% Fe+Si or 0.0132% Na+K i4 identified to be caused by the impurities.An improvement on the fracture toughness can be made by adding 0.05%-0.25% Ce to the alloy 2090. The reason behind this is that Ce microalloying can not only enhance both the intrinsic toughening level and the extrinsic toughening level but also suppress the embrittling behavior of the impurities. However, 0.06%-0.15% Ce microalloying fails to bring about any beneficial effect to the toughening level for the alloy 1420. 展开更多
关键词 al-li based alloy IMPURITY Ce addition TOUGHENING
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分级时效工艺对1420Al-Li合金组织与性能的影响 被引量:7
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作者 刘北兴 覃耀春 李仁顺 《宇航材料工艺》 CAS CSCD 北大核心 2001年第3期49-51,59,共4页
研究了分级时效工艺对 1 42 0Al -Li合金组织与性能的影响 ,试验结果表明 :经 70℃ /1 2h +1 2 0℃ /4~ 1 0h工艺分级时效处理可使 1 42 0Al-Li合金的综合力学性能得到显著的提高 ;分级时效工艺使1 42 0Al-Li合金析出的δ′相粒子分布... 研究了分级时效工艺对 1 42 0Al -Li合金组织与性能的影响 ,试验结果表明 :经 70℃ /1 2h +1 2 0℃ /4~ 1 0h工艺分级时效处理可使 1 42 0Al-Li合金的综合力学性能得到显著的提高 ;分级时效工艺使1 42 0Al-Li合金析出的δ′相粒子分布均匀。 展开更多
关键词 铝锂合金 分级时效 显微组织 力学性能 1420al-li合金
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准原位拉伸1420Al-Li合金的织构变化 被引量:2
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作者 陈忠伟 赵静 艾艳玲 《电子显微学报》 CAS CSCD 北大核心 2011年第4期328-333,共6页
1420Al-Li合金以其高比强度,高比刚度以及优良的低温性能,良好的耐腐蚀性和成型性而成为航空航天理想的轻质结构材料。本文对1420Al-Li合金进行了准原位拉伸试验,利用场发射扫描电子显微镜上安装的背散射电子衍射仪(EBSD-Channel5)对试... 1420Al-Li合金以其高比强度,高比刚度以及优良的低温性能,良好的耐腐蚀性和成型性而成为航空航天理想的轻质结构材料。本文对1420Al-Li合金进行了准原位拉伸试验,利用场发射扫描电子显微镜上安装的背散射电子衍射仪(EBSD-Channel5)对试样进行取向分析。EBSD结果表明:拉伸之前,1420Al-Li合金试样中存在弱织构{001}<100>;拉伸之后,弱织构消失,试样拉伸区存在近似于{001}<100>的{018}<018>织构。拉伸过程中晶粒绕晶带轴[001]和[010]发生转动,引起合金试样拉伸前后织构的变化。 展开更多
关键词 1420al-li合金 准原位拉伸 EBSD 织构
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1420Al-Li合金模锻件热处理新工艺及机理 被引量:1
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作者 黄光杰 汪凌云 +2 位作者 杨文敏 蒋作文 刘诚 《重庆大学学报(自然科学版)》 EI CAS CSCD 北大核心 2002年第12期42-45,共4页
采用正交法设计了 14 2 0Al-Li合金模锻件的热处理工艺方案 ,按设计方案进行了热处理试验和力学性能测试 ,并运用金相、透射电镜等手段研究了固溶温度、固溶时间、时效温度、时效时间影响14 2 0Al-Li合金模锻件强度和韧性的微观机制 ,... 采用正交法设计了 14 2 0Al-Li合金模锻件的热处理工艺方案 ,按设计方案进行了热处理试验和力学性能测试 ,并运用金相、透射电镜等手段研究了固溶温度、固溶时间、时效温度、时效时间影响14 2 0Al-Li合金模锻件强度和韧性的微观机制 ,获得了 14 2 0Al-Li合金模锻件的最佳热处理工艺制度。结果表明 :合金经 4 5 5℃× 170min固溶淬火 ,14 0℃× 12~ 16h时效工艺处理后 ,力学性能指标分别为σb≥ 4 93MPa ,σ0 .2 ≥ 398MPa ,σ≥ 12 9% ,达到最佳的强韧性效果。同时 。 展开更多
关键词 1420al-li合金 模锻件 工艺 铝锂合金 热处理 微观组织 力学性能 强韧化机理
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应力作用下1420Al-Li合金的腐蚀行为研究 被引量:4
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作者 陈文敬 李劲风 +2 位作者 赵旭山 任文达 郑子樵 《材料研究与应用》 CAS 2007年第2期113-117,共5页
通过动电位极化曲线、电化学阻抗谱,并结合SEM图,研究恒应力作用下1420Al-Li合金在3.5%NaCl溶液中的腐蚀行为.结果表明:随着应力增加,材料的腐蚀加剧;合金主要腐蚀类型为孔蚀,这是由于合金的主要时效强化相为δ′相(Al3Li),它作为阳极... 通过动电位极化曲线、电化学阻抗谱,并结合SEM图,研究恒应力作用下1420Al-Li合金在3.5%NaCl溶液中的腐蚀行为.结果表明:随着应力增加,材料的腐蚀加剧;合金主要腐蚀类型为孔蚀,这是由于合金的主要时效强化相为δ′相(Al3Li),它作为阳极相均匀弥散分布在基体中,晶界处仅有少量的S(Al2MgLi)相. 展开更多
关键词 1420al-li合金 动电位极化 电化学阻抗谱 恒应力
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1420Al-Li合金超塑特性及微成形 被引量:8
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作者 张凯锋 王长丽 于彦东 《金属成形工艺》 2003年第1期11-14,共4页
采用最大载荷法研究了 14 2 0Al Li合金的超塑特性 ,根据试验获得的超塑特性参数 ,采用两种形式的模具对 14 2 0Al Li合金的微成形性进行了研究。分析了成形压力、保压时间对微成形的影响 ,采用扫描电镜和金相显微镜分析了成形件的微观... 采用最大载荷法研究了 14 2 0Al Li合金的超塑特性 ,根据试验获得的超塑特性参数 ,采用两种形式的模具对 14 2 0Al Li合金的微成形性进行了研究。分析了成形压力、保压时间对微成形的影响 ,采用扫描电镜和金相显微镜分析了成形件的微观形貌 ,更好地理解了材料在微成形时的行为。 展开更多
关键词 超塑性 微成形 1420al-li合金 铝合金
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脉冲大电流扩散焊接Al-Li合金1420 被引量:1
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作者 彭勇 傅正义 +1 位作者 王为民 王皓 《焊接学报》 EI CAS CSCD 北大核心 2008年第1期57-60,共4页
采用脉冲大电流热加工技术焊接Al-Li合金1420。通过比较不同焊接工艺下的焊接产品,在最优焊接条件下获得了接头抗拉强度为母材强度75%的焊接接头。分析了接头微观结构及其对接头性能的影响,通过金相图片和扫描图片分析了接头处焊接点的... 采用脉冲大电流热加工技术焊接Al-Li合金1420。通过比较不同焊接工艺下的焊接产品,在最优焊接条件下获得了接头抗拉强度为母材强度75%的焊接接头。分析了接头微观结构及其对接头性能的影响,通过金相图片和扫描图片分析了接头处焊接点的形成过程,认为焊接过程实际可以分为由于微区熔化现象引起的焊接点高速形成阶段和围绕焊接点的原子扩散过程。脉冲大电流焊接过程由于焊接时间短,因而晶粒并没有发生二次生长。接头断口SEM照片显示,接头断裂方式为沿晶/穿晶混合断裂方式。 展开更多
关键词 脉冲大电流 扩散焊接 铝锂合金1420
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MgCl_2液滴对1420Al-Li合金腐蚀行为的研究
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作者 李朝兴 徐静 +2 位作者 李劲风 邓畅光 陈和兴 《材料研究与应用》 CAS 2013年第3期168-173,共6页
采用开尔文探针对1420Al-Li合金在初始浓度为0.1~1.0mol/L、体积为4μL的MgCl2液滴下的腐蚀行为进行了研究.结果表明,当MgCl2液滴初始浓度为0.1,0.3mol/L时,主要发生丝状腐蚀,其电位基线在-0.7^-0.8VSHE范围内,随着合金表面丝状腐蚀生... 采用开尔文探针对1420Al-Li合金在初始浓度为0.1~1.0mol/L、体积为4μL的MgCl2液滴下的腐蚀行为进行了研究.结果表明,当MgCl2液滴初始浓度为0.1,0.3mol/L时,主要发生丝状腐蚀,其电位基线在-0.7^-0.8VSHE范围内,随着合金表面丝状腐蚀生长的停止与开始,出现电位突然增加而后立即下降的现象.当初始浓度增加到1mol/L时,主要发生孔蚀,随着孔蚀的不断形成与钝化,出现电位突降而后立即回复的现象.当液滴达到环境相对湿度后,随着MgCl2初始浓度的增加阴极极限电流减小,腐蚀速率降低. 展开更多
关键词 1420al-li合金 开尔文探针 腐蚀 MgCl2液滴
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1420Al-Li合金冷轧板材的各向异性
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作者 钟利萍 郑子樵 +2 位作者 李锡武 吴迎学 黄兰平 《金属热处理》 EI CAS CSCD 北大核心 2005年第8期13-18,共6页
通过热处理、拉伸性能测试、金相及电镜观察分析,研究了1420Al-Li合金冷轧薄板的各向异性。结果表明,该合金在力学性能及拉伸断裂特征方面均具有明显的各向异性。经过不同的热处理,合金的各向异性程度不同:固溶水冷样比空冷样的最大强度... 通过热处理、拉伸性能测试、金相及电镜观察分析,研究了1420Al-Li合金冷轧薄板的各向异性。结果表明,该合金在力学性能及拉伸断裂特征方面均具有明显的各向异性。经过不同的热处理,合金的各向异性程度不同:固溶水冷样比空冷样的最大强度高,各向异性程度也较明显;空冷样σb各向异性程度随时效时间延长稍有增加。合金呈现明显的各向异性是由于其较高程度的轧制变形组织和时效析出相δ′等因素综合作用的结果。 展开更多
关键词 1420A1-Li合金 热处理 力学性能 各向异性 断裂行为
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Superplastic deformation behavior and mechanism of 1420 Al-Li alloy sheets with elongated grains 被引量:2
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作者 张新明 郑大伟 +1 位作者 叶凌英 唐建国 《Journal of Central South University》 SCIE EI CAS 2010年第4期659-665,共7页
True stress-true strain curve,microstructure and texture information were obtained to investigate the superplastic deformation behavior of 1420 Al-Li alloy sheets with initial elongated grains.From the true stress-tru... True stress-true strain curve,microstructure and texture information were obtained to investigate the superplastic deformation behavior of 1420 Al-Li alloy sheets with initial elongated grains.From the true stress-true curve,the stress increases with the increase of strain to 0.15,then dramatically decreases with the increase of strain to 0.80,and finally keeps almost a horizontal line.Meanwhile,initial elongated grains are gradually changed into equiaxed grains and the initial strong Brass {0 1 1} <2 1 1> and S {1 2 3} <6 3 4> orientations are turned into nearly random orientation with increasing strain.All these results suggest that dislocation activity is the dominant mechanism during the first stage,then dynamic recrystallization occurs,and grain rotation is expected as an accommodation for grain boundary sliding(GBS).At larger strains,grain boundary migration(GBM) becomes necessary to accommodate GBS. 展开更多
关键词 1420 al-li alloy SUPERPLASTICITY MICROSTRUCTURE TEXTURE DISLOCATION
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Preparation and Corrosion Resistance of Anodic Oxidation Coatings on 2198 and 5A90 Al-Li Alloys 被引量:3
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作者 WANG Henan LI Xinming +2 位作者 HE Linbo CUI Baolei LIU Chunzhong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第1期132-137,共6页
2198 and 5A90 Al-Li alloys were anodized with a constant DC potential in 18%H_2SO_4solution(Solu.A) and the mixture solution of 18%H_2SO_4+5%C_2H_2O_4(Solu.B) at room temperature. 12 and 11 V was optimized as the appl... 2198 and 5A90 Al-Li alloys were anodized with a constant DC potential in 18%H_2SO_4solution(Solu.A) and the mixture solution of 18%H_2SO_4+5%C_2H_2O_4(Solu.B) at room temperature. 12 and 11 V was optimized as the applied oxidation potential for 2198 and 5A90 alloys, respectively. Cross-sectional morphology, surface morphology and elements distribution of anodic oxidation coatings were observed by scanning electron microscope equipped with energy dispersive X-ray analysis(SEM/EDX). Corrosion resistance was tested by potentiodynamic polarization plot in 3.5%NaCl solution. The results showed that the thicknesses of coatings obtained at the selected potential in Solu.A and Solu.B were about 50 μm/110 μm for 2198 alloy and 80 μm/110 μm for 5A90 alloy. In both solutions, anodic oxidation coatings of 2198 alloy were primarily composed of Al oxides; those of 5A90 alloy were mainly consisted of Al oxides and a small amount of Mg oxides. The results of potentiodynamic polarization showed that anodic oxidation coatings of 2198 and 5A90 Al-Li alloys had better corrosion resistances than that of untreated alloys. 展开更多
关键词 al-li alloy the MIXTURE solution anodic OXIDATION coating corrosion resistance thickness
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Formation mechanism of gradient-distributed particles and their effects on grain structure in 01420 Al-Li alloy 被引量:5
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作者 张新明 叶凌英 +2 位作者 刘颖维 杜予晅 罗智辉 《Journal of Central South University of Technology》 EI 2008年第2期147-152,共6页
Fine-grained 01420 Al-Li alloy sheets were produced by thermo-mechanical processing based on the mechanism of particle stimulated nucleation of recrystallization.The thermo-mechanically processed sheets were observed ... Fine-grained 01420 Al-Li alloy sheets were produced by thermo-mechanical processing based on the mechanism of particle stimulated nucleation of recrystallization.The thermo-mechanically processed sheets were observed to contain layers of different microstructures along the thickness.The precipitate behavior of the second phase particles and their effects on the distribution of dislocations and layered recrystallized grain structure were analyzed by optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM) and X-ray diffractometry(XRD).The formation mechanism of the gradient particles was discussed.The results show that after aging,a gradient distribution of large particles along the thickness is observed,the particles in the surface layer(SL) are distributed homogeneously,whereas those in the center layer(CL) are mainly distributed parallel to the rolling direction,and the volume fraction of the particles in the SL is higher than that in the CL.Subsequent rolling in the presence of layer-distributed particles results in a corresponding homogeneous distribution of highly strained regions in the SL and a banded distribution of them in CL,which is the main reason for the formation of layered grain structure along the thickness in the sheets. 展开更多
关键词 01420 al-li alloy layered grain structure grain refinement thermo-mechanical processing particle stimulatednucleation(PSN)
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Thermal Stress Analysis of Welded Joint in 1420 Al-Li Alloy Induced by Thermal Cycling
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作者 Hongbin GENG Song HE Dezhuang YANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第z1期205-208,共4页
A model of double grains under plane stress state has been established. According to the double grain model, thermal stress induced by thermal cycling in welding fusion zone is numerically simulated by finite element ... A model of double grains under plane stress state has been established. According to the double grain model, thermal stress induced by thermal cycling in welding fusion zone is numerically simulated by finite element method, and the microstructures before and after thermal cycling are observed. The effect of thermal stress on weld microstructure is discussed. Experimental and analysis results show that the difference between the coefficients of thermal expansion and elastic modulus for grains along different crystal directio n can produce alternate thermal misfit stress and strain near boundaries under thermal cycling. At the temperature of upper and lower limit, thermal stress nearby grain boundary reaches maxima. Thermal stress induced changes in microstructure, which expressed by the sending dislocations from boundaries to matrix, piling up against the boundaries and the increasing of dislocation density. 展开更多
关键词 Thermal cycling al-li alloy Weld Microstructure FINITE element method
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PRECIPITATION IN BINARY Al-Li ALLOYS
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作者 YAO Daping HU Zhuangqi ZHANG Yun SHI Changxu Institute of Metal Research,Academia Sinica,Sheyang,China Institute of Metall Research,Academia Sinica,Shenyang 110015,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1990年第5期347-351,共5页
Studies were carried out on the precipitation in two sets of binary Al-Li alloys by means of hardness tests,DSC analyses and TEM observations.When the alloys were aged for constant time,a peak appeared on the plot of ... Studies were carried out on the precipitation in two sets of binary Al-Li alloys by means of hardness tests,DSC analyses and TEM observations.When the alloys were aged for constant time,a peak appeared on the plot of temperature dependence upon their hardness in the range of low temperatures,and the endothermic dissolution peak was quite distinct on the DSC curve also at low temperatures.These are believed that an Li-rich GP zone formed in the al- loys aged at low temperatures,but no more GP zone if aging at elevated temperatures.The hardness of the alloys raises rapidly with coarsening of δ′-phase grains.The two endothermic peaks of δ′ dissolution on the DSC curve relate to the structural adjustment at twice of the δ′ precipitation.The equilibrium δ-phase,being of higher thermal stability,nucleates and grows directly from the supersaturated solid solution with the aid of the gram boundary. 展开更多
关键词 binary al-li alloy PRECIPITATION DISSOLUTION endothermic peak aging
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MICROSTRUCTURAL VARIATION AND FRACTURE MODES IN Al-Li ALLOYS
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作者 SONG Shihong LI Xuzhi ZHANG Weibin Central-South University of Technology,Changsha,China SONG Shihong,Department of materials Science,Central-South University of Technology,Changsha,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1989年第1期73-76,共4页
The correlation between the diverse fracture modes and the microstructural variation with recrystallization in the Al-Li alloys under heat treatment was observed by means of triplanar optical and scanning electron mic... The correlation between the diverse fracture modes and the microstructural variation with recrystallization in the Al-Li alloys under heat treatment was observed by means of triplanar optical and scanning electron microscopy.The growth,propagation and feature of their frac- tures were described from the viewpoint of microstructure,energy and geometry. 展开更多
关键词 al-li alloy FRACTURE RECRYSTALLIZATION AGING
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