摘要
基于金属熔体脱合金法制备了具有核壳混杂增强结构(核相为高熔点富Ta相,壳为B2-CuZr相)的[(Zr_(0.5)Cu_(0.5))_(92.5)Al_(7)Sn_(0.5)]_(0.95)Ta_(5)非晶复合材料,系统研究了不同脱合金工艺参数下非晶复合材料的显微组织及力学性能的演变规律。结果表明:脱合金温度和时间是控制富Ta相尺寸的关键参数。当反应温度过低或反应时间过短时,会造成富Ta相聚集、增强相分布不均匀;当反应温度过高或反应时间过长时,会导致富Ta相粗化。当脱合金反应时间为2 min、脱合金反应温度为1473 K时,非晶基体中富Ta相尺寸细小且弥散分布,并促进B2-CuZr相异质形核细化,得到了尺寸更细小、分布更均匀的核壳混杂增强结构。细小均匀的增强相可有效阻碍非晶基体中主剪切带的快速扩展,复合材料的力学性能得到大幅提高,断裂强度达到2439 MPa,塑性应变为11.6%。
The reinforced[(Zr_(0.5)Cu_(0.5))_(92.5)Al_(7)Sn_(0.5)]_(0.95)Ta_(5)amorphous alloy matrix composites with the core-shell hybrid structure(Ta-rich phase as core-phase,B2-CuZr as shell-phase)were prepared by dealloying reaction in metallic melt.The evolution law of the microstructure and mechanical property of the amorphous alloy matrix composites under different dealloying parameters was symmetrically investigated.The results show that dealloying temperature and time are key parameters that affected the size of Ta-rich phase.When the dealloying temperature is low or time is short,Ta-rich phase will aggregate together and distribute inhomogeneously.When the temperature is high or the time is long,Ta-rich phase will coarsen.When the dealloying time and temperature is 2 min and 1473 K,respectively,the obtained refined Ta-rich phase distributes homogeneously and contributes to the refinement of B2-CuZr.The refined and homogeneously distributes core-shell hybrid reinforcing structure can hinder the rapid propagation of main shear band to further improve the mechanical property,thus improving the mechanical property of the composites with fracture strength of 2439 MPa and plastic strain of 11.6%.
作者
李龙丰
郭威
吕书林
王锦程
吴树森
LI Longfeng;GUO Wei;LYU Shulin;WANG Jincheng;WU Shusen(State Key Laboratory of Material Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China;Research Institute of Huazhong University of Science and Technology in Shenzhen,Shenzhen 518057,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2024年第7期2283-2292,共10页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(52101138)
湖北省自然科学基金资助项目(2023AFB798)
深圳市科技计划资助项目(JCYJ20220530160813032)
西北工业大学凝固技术国家重点实验室开放课题(SKLSP202309)。
关键词
非晶复合材料
核壳混杂增强结构
金属熔体
脱合金法
力学性能
amorphous alloy matrix composites
core-shell hybrid reinforcing structure
metallic melt
dealloying
mechanical property
