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Comprehensive study on quasi-static and dynamic mechanical properties and wear behavior of Mg–B4C composite compacted at several loading rates through powder metallurgy 被引量:3
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作者 K.RAHMANI G.H.MAJZOOBI +1 位作者 G.EBRAHIM-ZADEH M.KASHFI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第2期371-381,共11页
The present study aims to fabricate and evaluate the mechanical properties and wear behavior of Mg metal matrix composite,reinforced by 0,1.5,3,5 and 10 vol.%B4C microparticles.Mg−B4C samples were fabricated at 450℃ ... The present study aims to fabricate and evaluate the mechanical properties and wear behavior of Mg metal matrix composite,reinforced by 0,1.5,3,5 and 10 vol.%B4C microparticles.Mg−B4C samples were fabricated at 450℃ and under different loading rates by using split Hopkinson bar(SHB),drop hammer(DH)and Instron(QS)at strain rates of 1600,800 and 0.008 s–1,respectively.The mechanical properties including microhardness,quasi-static and dynamic compressive strengths and wear behavior of samples were experimentally investigated.The results show that,the hardness of SHB and DH samples is obtained to be 20.2%and 5.7%higher than that of the QS sample,respectively.The wear rate and wear mass loss of Mg–10.0%B4C samples fabricated by SHB were determined lower than those of the QS sample by nearly 33%and 39%,respectively.The quasi-static compressive strengths of Mg−5.0%B4C are improved by 39%,30%and 29%for the SHB,DH and QS samples,respectively,in comparison with the case of pure Mg.Furthermore,it is discovered that the dynamic compressive strength of samples is 51%−110%higher than their quasi-static value with respect to the B4C content. 展开更多
关键词 powder compaction high strain rate Mg−b4c composite hardness mechanical properties wear behavior
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B_(4)C含量对(Ti_(0.25)Zr_(0.25)Hf_(0.25)Ta_(0.25))B_(2)-B_(4)C陶瓷力学性能及抗氧化性能的影响
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作者 刘国昂 王海龙 +2 位作者 方成 黄飞龙 杨欢 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2024年第6期697-706,共10页
新型高熵硼化物陶瓷具有优异的高温稳定性、低热导率等优点,在高温热防护领域具有广阔的应用前景。本研究采用硼/碳热还原法结合热压烧结技术在1900℃下制备了(Ti_(0.25)Zr_(0.25)Hf_(0.25)Ta_(0.25))B_(2)-B_(4)C高熵硼化物陶瓷,并研究... 新型高熵硼化物陶瓷具有优异的高温稳定性、低热导率等优点,在高温热防护领域具有广阔的应用前景。本研究采用硼/碳热还原法结合热压烧结技术在1900℃下制备了(Ti_(0.25)Zr_(0.25)Hf_(0.25)Ta_(0.25))B_(2)-B_(4)C高熵硼化物陶瓷,并研究了B_(4)C第二相含量对其力学及抗氧化性能的影响规律。结果表明,B_(4)C均匀分布在高熵基体中,有效改善了高熵陶瓷的相对密度和力学性能。当B_(4)C体积分数为20%时,复相陶瓷的抗弯强度、断裂韧性以及维氏硬度均达到最高,分别为(570.0±27.6)MPa、(5.58±0.36)MPa·m^(1/2)和(24.6±1.1)GPa。微观结构分析表明,B_(4)C能够钉扎晶界、细化晶粒,并能够引入裂纹偏转、分支等增韧机制,最终实现复相陶瓷的强化及韧化。此外,利用静态氧化实验,揭示了B_(4)C含量对复相陶瓷800~1400℃抗氧化性能的影响。当B_(4)C体积分数不小于20%时,其氧化生成的玻璃相B_(2)O_(3)能够均匀包裹(Zr,Hf)O_(2)、TiO_(x)及Ta_(2)O_(5)等高熵基体对应的氧化物,从而在陶瓷表面形成均匀致密的氧化层,抑制氧向基体内部扩散,降低氧化层厚度并提升复相陶瓷的抗氧化性能。本工作能够为高熵硼化物陶瓷的力学及抗氧化性能研究提供实验依据和数据支撑。 展开更多
关键词 高熵硼化物陶瓷 b_(4)c 力学性能 抗氧化性能
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Solid-state composite technology for B_4C_p reinforced magnesium-lithium alloy
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作者 吴利斌 孟祥瑞 +3 位作者 巫瑞智 崔崇亮 张密林 张景怀 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第4期820-824,共5页
B 4 C p /Mg-8Li-1Zn and B 4 C p /Mg-8Li-1Al-1Y composites were prepared with hot-extrusion solid-state composite processing. The microstructures and mechanical properties of the composites were studied. With the optim... B 4 C p /Mg-8Li-1Zn and B 4 C p /Mg-8Li-1Al-1Y composites were prepared with hot-extrusion solid-state composite processing. The microstructures and mechanical properties of the composites were studied. With the optimized parameters, the deformation effects and the migration of α phase are improved, and the amount and size of foil gaps are decreased. The bonding force between foils is improved, and the oxidation of foils is lowered. The results of tensile test show that the strengths of the B 4 C p /Mg-8Li-1Zn and B 4 C p /Mg-8Li-1Al-1Y composites are increased obviously after hot-extrusion solid-state composite processing (238 MPa and 257.23 MPa, respectively). The specific strength of B 4 C p /Mg-8Li-1Al-1Y composite is the highest (169.23×10 3 cm). 展开更多
关键词 Mg-Li base composites b4c MIcROSTRUcTURES mechanical properties
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B_(4)C含量对铝基陶瓷静态力学性能的影响
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作者 徐琰晟 张石岩 《集成电路应用》 2022年第4期58-59,共2页
阐述对于B_(4)C/Al复合材料的准静态力学性能测试,并结合微观分析,得出B_(4)C含量对复合材料静态力学性能的影响以及其断面破坏方式。
关键词 复合材料 b_(4)c 铝基陶瓷 力学性能
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机械合金化与热压烧结法制备2Si-B-3C-N陶瓷 被引量:3
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作者 杨治华 段小明 +1 位作者 贾德昌 周玉 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2009年第A02期150-152,共3页
以Si3N4、B4C、C、Si等粉末为原料,采用机械合金化方法制备2Si-B-3C-N粉末,在氮气保护下1900℃,40MPa热压烧结30min获得2Si-B-3C-N陶瓷,研究了块体陶瓷微观组织结构与力学性能。高能球磨粉末在热压烧结后致密度达到了97.9%。热压烧结的2... 以Si3N4、B4C、C、Si等粉末为原料,采用机械合金化方法制备2Si-B-3C-N粉末,在氮气保护下1900℃,40MPa热压烧结30min获得2Si-B-3C-N陶瓷,研究了块体陶瓷微观组织结构与力学性能。高能球磨粉末在热压烧结后致密度达到了97.9%。热压烧结的2Si-B-3C-N陶瓷中主要含有等轴状的β-SiC和层片状的h-BCN相。BCN晶粒尺寸约为200nm,SiC晶粒尺寸约为400~500nm。BCN晶粒主要分布在SiC晶粒周围。2Si-B-3C-N陶瓷的室温抗弯强度、弹性模量、断裂韧性、硬度分别为446.6MPa、144.6GPa、5.10MPa·m1/2和5.53GPa。在高温空气状态下,2Si-B-3C-N陶瓷的抗弯强度随温度的升高而降低,1000和1400℃下的抗弯强度分别为358.7和202.1MPa。 展开更多
关键词 Si—b-c-N陶瓷 机械合金化 热压烧结 微观组织 力学性能
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以Al-B-C为烧结助剂的SiC陶瓷热压烧结工艺 被引量:3
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作者 马瑞琦 施嘉辉 +3 位作者 刘东旭 方宁象 高明霞 陈建军 《材料科学与工程学报》 CAS CSCD 北大核心 2021年第6期916-921,980,共7页
以SiC超细粉末为原料,Al粉、B粉和碳黑为烧结助剂,采用热压烧结工艺制备了SiC陶瓷,重点研究了烧结助剂含量(4~13wt%)对SiC陶瓷物相组成、致密度、断面结构及力学性能的影响。除SiC主晶相外,X射线衍射图还显示了Al8B4C7相的存在;当烧结... 以SiC超细粉末为原料,Al粉、B粉和碳黑为烧结助剂,采用热压烧结工艺制备了SiC陶瓷,重点研究了烧结助剂含量(4~13wt%)对SiC陶瓷物相组成、致密度、断面结构及力学性能的影响。除SiC主晶相外,X射线衍射图还显示了Al8B4C7相的存在;当烧结助剂的含量从4wt%增至13wt%时,扫描电镜照片显示陶瓷断面形貌从疏松结构变成致密结构,存在晶粒拔出现象;陶瓷力学性能随着烧结助剂含量的增加先升高后降低。当烧结助剂含量为10wt%时,SiC陶瓷的力学性能达到最高,抗弯强度为518.1MPa,断裂韧性为4.98MPa·m^(1/2)。Al、B和C烧结助剂在1850℃烧结温度下形成的Al8B4C7液相促进晶粒间的重排和传质,并填充晶粒间的气孔,提高了陶瓷致密度。 展开更多
关键词 SIc陶瓷 Al-b-c烧结助剂 热压烧结 微观结构 力学性能
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球磨对超重力下自蔓延离心熔铸Ti-B-W-C系复相陶瓷微观形貌及力学性能的影响 被引量:1
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作者 娄光普 赵忠民 《人工晶体学报》 EI CAS CSCD 北大核心 2016年第5期1211-1215,1222,共6页
采用行星式球磨机对超重力离心熔铸Ti-B-W-C复相陶瓷的原始粉料进行球磨,通过对球磨转速的控制得到不同研磨程度的粉料,通过对制得的复相陶瓷进行微观结构和力学性能分析,发现随着球磨机转速的提高,球磨效率大大改善,粉料大幅度细化,Al... 采用行星式球磨机对超重力离心熔铸Ti-B-W-C复相陶瓷的原始粉料进行球磨,通过对球磨转速的控制得到不同研磨程度的粉料,通过对制得的复相陶瓷进行微观结构和力学性能分析,发现随着球磨机转速的提高,球磨效率大大改善,粉料大幅度细化,Al粉以团絮状均匀附着在片状Ti和WO_3晶粒周围。对粉料进行烧制,成功得到宏观致密、微观夹杂和气孔等缺陷明显减少、硬度等力学性能明显提升的复相陶瓷。 展开更多
关键词 球磨 Ti-b-W-c复相陶瓷 微观结构 力学性能
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Achieving strength-ductility synergy in cold spray additively manufactured Al/B4C composites through a hybrid post-deposition treatment 被引量:9
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作者 Naeem ul Haq Tariq Lawrence Gyansah +6 位作者 Xiang Qiu Chunnijia Hasan Bin Awais Chengwu Zheng Hao Du Jiqiang Wang Tianying Xiong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第6期1053-1063,共11页
Cold spray additive manufacturing(CSAM) provides a potential solid state manufacturing route to fabricate variety of aluminum matrix composites(AMCs) with reduced possibility of undesired chemical reactions and residu... Cold spray additive manufacturing(CSAM) provides a potential solid state manufacturing route to fabricate variety of aluminum matrix composites(AMCs) with reduced possibility of undesired chemical reactions and residual thermal stresses. This study presents a hybrid(i.e. hot compression + hot rolling)post-deposition treatment to reinvigorate the mechanical properties of cold spray additively manufactured Al/B4 C composites. The as-deposited samples were initially subjected to 30% thickness reduction via hot compression treatment at 500°C followed by a hot rolling treatment with 40% thickness reduction in 2 passes. Electron backscatter diffraction(EBSD) and high resolution transmission electron microscopy(HRTEM) results revealed that after hybrid post-deposition treatment(involving 70%accumulative thickness reduction), the aluminum grains in the matrix were extensively refined due to simultaneous operation of continuous dynamic recrystallization(CDRX) and geometric dynamic recrystallization(GDRX). Furthermore, interfacial defects were remarkably reduced while the nature of Al/Al and Al/B4C interfacial bonding was changed from sheer mechanical interlocking to metallurgical bonding which facilitated efficient transference of applied load to uniformly dispersed bimodal B4C particles. As a result, ultimate tensile strength(UTS) and elongation(EL) of the as-deposited sample were simultaneously improved from 37 to 185 MPa and 0.3% to 6.2%, respectively. 展开更多
关键词 cold spray additive manufacturing Post-deposition treatments Al/b4c cOMPOSITES Dynamic recrystallization mechanical properties
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Reactive-sintering B_4C matrix composite for armor applications 被引量:1
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作者 Chao Wu Yun-Kai Li Chun-Lei Wan 《Rare Metals》 SCIE EI CAS CSCD 2020年第5期529-544,共16页
The B4C matrix composite intended for armor applications still presents restrictions,such as low sintering density,production of large parts and inherited brittleness Herein,research on this topic is discussed in deta... The B4C matrix composite intended for armor applications still presents restrictions,such as low sintering density,production of large parts and inherited brittleness Herein,research on this topic is discussed in detail.First the material outlook of armor applications is organized from the development of composite armor and ceramic materials for armor to the B4C matrix composite and reactive-sintering method.In the second section,the technologies are reviewed for reactive pressureless sintering reactive hot-pressing sintering,reactive discharge plasma sintering and self-propagating high-temperature sintering Thereafter,our previous works on the TiB2/SiC/B4C composite and laminated Ti/B4C composite are employed to illustrate their microstructural evolution,phase transformation and fracture model.These studies provide a potential method for producing tough and high-strength ceramic composites for armor application.In the fina section,the mechanism,evaluation method and influencing factors of anti-penetration for ceramic armor and B4C matrix composite are reviewed. 展开更多
关键词 composite armor b4c matrix composite Reactive sintering mechanical properties
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无机法制备Si-B-C-N系非晶/纳米晶新型陶瓷及复合材料研究进展 被引量:4
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作者 梁斌 杨治华 +2 位作者 贾德昌 段小明 周玉 《科学通报》 EI CAS CSCD 北大核心 2015年第3期236-245,共10页
可以在高温氧化、剧烈热震、燃气流烧蚀等苛刻条件下服役的新型高温结构和多功能防热材料是现代航空航天技术发展的迫切需求之一.Si-B-C-N系非晶及纳米晶复相陶瓷组织结构独特,高温性能优异,在高温结构和多功能防热领域极具应用潜力.有... 可以在高温氧化、剧烈热震、燃气流烧蚀等苛刻条件下服役的新型高温结构和多功能防热材料是现代航空航天技术发展的迫切需求之一.Si-B-C-N系非晶及纳米晶复相陶瓷组织结构独特,高温性能优异,在高温结构和多功能防热领域极具应用潜力.有机聚合物先驱体裂解法(有机法)在致密Si-B-C-N系块体陶瓷的制备方面受限,哈尔滨工业大学特种陶瓷研究所开创的机械合金化-热压法(无机法)工艺简单,制备材料组织结构均匀、性能优良,成为Si-B-C-N系致密块体陶瓷和耐高温构件的有效制备手段,弥补了有机法的不足,对于丰富和完善该材料的实验数据和理论研究具有重要意义.本文综述了无机法制备Si-B-C-N系陶瓷及复合材料在显微组织结构特征及演变规律、力学和热物理学性能、抗氧化性能、抗热震性能、耐烧蚀性能和相关机理分析等方面的新近成果,并展望了其发展趋势. 展开更多
关键词 Si-b-c-N系陶瓷 非晶/纳米晶 机械合金化 热压烧结 组织结构 力学性能 热物理学性能 高温性能
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