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热处理过程中Mg-8Gd-3Y-1Nd-0.5Zr合金的组织演变及性能 被引量:6
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作者 冯艳 李晓庚 +1 位作者 王日初 彭超群 《中国有色金属学报》 EI CAS CSCD 北大核心 2017年第9期1794-1802,共9页
采用透射电镜、扫描电镜、能谱分析、X射线衍射及力学性能等测试手段,研究热处理工艺对水冷铸造的Mg-8Gd-3Y-1Nd-0.5Zr(质量分数)合金显微组织、力学性能和耐腐蚀性能的影响。合金铸态显微组织由α-Mg、Mg(Gd,Y)相、富Zr小颗粒相和β-Mg... 采用透射电镜、扫描电镜、能谱分析、X射线衍射及力学性能等测试手段,研究热处理工艺对水冷铸造的Mg-8Gd-3Y-1Nd-0.5Zr(质量分数)合金显微组织、力学性能和耐腐蚀性能的影响。合金铸态显微组织由α-Mg、Mg(Gd,Y)相、富Zr小颗粒相和β-Mg_(24)Y_5网状共晶组成。在520℃固溶24 h后,合金中共晶相固溶进基体,固溶演变过程为α-Mg+β-Mg_(24)Y_5相+Mg(Gd,Y)→过饱和α-Mg固溶体+Mg(Gd,Y)相。225℃时效,合金的析出序列为Mg(S.S.S.S)→β″(DO19)→β′(CBCO)→β_1(FCC)→β(FCC),时效24 h达到峰时效态,合金的室温抗拉强度达到231MPa,伸长率为3.4%。时效处理能提高合金耐腐蚀性能,225℃时效72 h时合金析出稳定β(FCC)相,平均析氢速率最小,为0.22 mL/(cm^2·h),合金的耐腐蚀性能最强。 展开更多
关键词 mg-8gd-3y-1nd-0.5zr合金 固溶处理 显微组织 力学性能 析出序列
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Comparative study on corrosion behavior of as-cast and extruded Mg-5Y-7Gd-1Nd-0.5Zr alloy in 5% NaCl aqueous solution 被引量:3
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作者 张新 张奎 +4 位作者 李兴刚 邓霞 李宏伟 张宝东 王长顺 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第5期1018-1027,共10页
The corrosion behaviours of Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloys prepared by as-casting and extrusion were investigated in 5% NaCl aqueous solution by immersion and electrochemical tests. The microstructure indicates ... The corrosion behaviours of Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloys prepared by as-casting and extrusion were investigated in 5% NaCl aqueous solution by immersion and electrochemical tests. The microstructure indicates the mean grain size of 15 μm for the extruded and 100 μm for the as-cast Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloys. The corrosion morphology of as-cast sample shows pitting corrosion and little filiform corrosion, but that of the extruded sample shows pitting corrosion at the initial stage. The corrosion rate of extruded sample is higher than that of as-cast Mg-5Y-7Gd-1Nd-0.5Zr alloy according to the immersion test. The second phases containing RE acting as cathodes improve the corrosion properties. The corrosion potentials of as-cast and extruded Mg-5Y-7Gd-1Nd-0.5Zr alloys are -1.658 V and -1.591 V, respectively. The origins of the distinctive corrosion behavior of as-cast and extruded Mg-5Y-7Gd-1Nd-0.5Zr Mg alloys were discussed. 展开更多
关键词 {0.5y-7gd-1nd-0.5zr magnesium alloy corrosion morphology polarization curve
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织构对Mg-Gd-Y-Nd-Zr合金疲劳性能的影响
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作者 罗安 邓运来 官立群 《材料科学》 CAS 2021年第5期554-561,共8页
本文以不同织构的Mg-6Gd-2.5Y-1Nd-0.5Zr合金为对象,研究了织构对疲劳性能的影响。通过扫描电镜表征了疲劳后试样的断口形貌,在金相显微镜下表征了表面裂纹的扩展路径,并对比不同织构合金的疲劳后试样的形貌差异。结果表明,在形成基面... 本文以不同织构的Mg-6Gd-2.5Y-1Nd-0.5Zr合金为对象,研究了织构对疲劳性能的影响。通过扫描电镜表征了疲劳后试样的断口形貌,在金相显微镜下表征了表面裂纹的扩展路径,并对比不同织构合金的疲劳后试样的形貌差异。结果表明,在形成基面织构后,合金的平均晶界取向差从62.32˚降低到44.01˚,平均施密特因子从0.381降低到0.278,组织均匀性得到提升。晶粒内的位错滑移得到抑制,这使得合金的裂纹萌生寿命和裂纹扩展寿命均得到延长,从而提高了合金的疲劳性能。 展开更多
关键词 mg-6gd-2.5y-1nd-0.5zr 疲劳 织构 晶界取向差
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脉冲磁场对Mg-4Y-2.5Nd-0.5Gd-0.5Zr合金凝固组织和力学性能的影响
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作者 刘武平 陈乐平 +2 位作者 周全 袁源平 刘曜熙 《特种铸造及有色合金》 CAS 北大核心 2024年第8期1137-1143,共7页
以Mg-4Y-2.5Nd-0.5Gd-0.5Zr镁合金为对象,采用OM、SEM、XRD、EDS及万能拉伸试验机等手段,研究了不同脉冲磁场工艺参数对该合金凝固组织和力学性能的影响。结果表明,脉冲磁场能有效改善Mg-4Y-2.5Nd-0.5Gd-0.5Zr合金的凝固组织并提高其力... 以Mg-4Y-2.5Nd-0.5Gd-0.5Zr镁合金为对象,采用OM、SEM、XRD、EDS及万能拉伸试验机等手段,研究了不同脉冲磁场工艺参数对该合金凝固组织和力学性能的影响。结果表明,脉冲磁场能有效改善Mg-4Y-2.5Nd-0.5Gd-0.5Zr合金的凝固组织并提高其力学性能。在0~300 V、0~10 Hz、200~600℃内,Mg-4Y-2.5Nd-0.5Gd-0.5Zr合金的晶粒尺寸随着脉冲电压的增大逐渐减小,随着脉冲频率和模具温度的增加先减小后增大,而合金的抗拉强度和伸长率随着脉冲电压的增加逐渐提高,随着脉冲频率和模具温度的增加先提高后降低。在脉冲电压为300 V、脉冲频率为5 Hz、模具温度为400℃时,合金的晶粒尺寸达到最小值,为41.66μm,相比未处理的合金细化了18.82%。同时,合金的抗拉强度和伸长率都达到最大值,分别为184.88 MPa和4.67%,相比未处理的合金分别提高了10.2%和45.94%。Mg-4Y-2.5Nd-0.5Gd-0.5Zr合金的最佳脉冲磁场处理工艺:脉冲电压为300 V、脉冲频率为5 Hz、模具温度为400℃。 展开更多
关键词 脉冲磁场 mg-4y-2.5nd-0.5gd-0.5zr镁合金 凝固组织 力学性能
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Corrosion behaviors for peak-aged Mg-7Gd-5Y-lNd-0.5Zr alloys with oxide films 被引量:1
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作者 Quan-Tong Jiang Kui Zhang +4 位作者 Xing-Gang Li Yong-Jun Li Ming-Long Ma Guo-Liang Shi Jia-Wei Yuan 《Rare Metals》 SCIE EI CAS CSCD 2016年第10期758-762,共5页
The corrosion behaviors of T5 (225 ℃, 6.5 h) and T6 (460 ℃, 2 h + 225 ℃, 12 h) peak-aged Mg-7Gd- 5Y-1Nd-0.5Zr alloys with oxide films were investigated by optical microscope (OM), scanning electron microsco... The corrosion behaviors of T5 (225 ℃, 6.5 h) and T6 (460 ℃, 2 h + 225 ℃, 12 h) peak-aged Mg-7Gd- 5Y-1Nd-0.5Zr alloys with oxide films were investigated by optical microscope (OM), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The weight loss rates and electrochemical tests were also analyzed. The thicknesses of T5 and T6 oxide films are roughly 0.6 and 1.0 μm, respectively. The components of oxide films mainly consist of O, Mg, Y, Nd, and Gd, and the T6 oxide film results in surfaces with larger peaks than T5 oxide film. In addition, Y, Nd, and Gd peaks are all higher than those of Mg-7Gd-5Y- 1Nd-0.5Zr alloys, but Mg peak is consistently far below than that of the alloys. The specimens could be arranged in de- creasing order of corrosion rates and corrosion current densi- ties: T6 oxide film 〈 T5 oxide film 〈 T6 without oxide film 〈 T5 without oxide film. The oxide films are compact to increase the corrosion resistance for Mg-7Gd-5Y-1Nd-0.5Zr alloys, which will provide a guiding insight into the corrosion and protection of Mg-RE alloys in atmospheric environments. 展开更多
关键词 mg-7gd-5y-1nd-0.5zr alloys Peak-aged Oxide film Corrosion behavior
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