应变速率对具有形变诱发相变的TiZr基非晶复合材料力学行为的影响  

Effects of Strain Rate on Mechanical Behavior of TiZr-Based Amorphous Alloy Composites With Deformation-Induced Phase Transformation

作　　者：郑佳奇 赵子彦 牟娟[1] ZHENG Jiaqi;ZHAO Ziyan;MU Juan(Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China)

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110819

出　　处：《沈阳大学学报（自然科学版）》2021年第4期294-299,共6页Journal of Shenyang University：Natural Science

基　　金：国家自然科学基金资助项目(51771049,51790484);冲击材料科学与技术国家重点实验室项目(JCKYS2020602005).

摘　　要：为了探究TiZr基非晶复合材料在不同应变速率下的力学行为,在不同的应变速率下(10^(-1)~10^(2) ks^(-1))对具有形变诱发相变行为的非晶复合材料Ti_(45.7)Zr_(33)Ni_(3)Cu_(5.8)Be_(12.5)进行单轴压缩实验,随后应用X射线衍射仪和场发射扫描电镜对变形后的样品进行结构表征.结果表明,随着应变速率的增加,屈服强度呈现较弱的正应变速率敏感性,在10^(2) ks^(-1)下达到最大值1585 MPa;断裂强度及塑性应变表现为抛物线型变化规律,均在10^(1) ks^(-1)达到最大值,分别为1984 MPa和7.6%.晶态相在变形后发生了马氏体相变,并在非晶基体中形成了由马氏体相变诱发的多重剪切带.应变速率的增加可以促进马氏体相变的发生,使相变增塑效应增强,而非晶合金中随着应变速率的增加会抑制剪切带的萌生和增殖,表现出塑性负相关性,二者之间的耦合作用决定了非晶复合材料的力学性能.In order to explore the mechanical behavior of TiZr-based amorphous composites under different strain rates,under different strain rates(10^(-1)~10^(2) ks^(-1)),the amorphous composite Ti_(45.7)Zr_(33)Ni_(3)Cu_(5.8)Be_(12.5) with deformation-induced phase transition behavior was subjected to uniaxial compression experiments,then X-ray diffractometer and field emission scanning electron microscope were used to characterize the structure of the deformed sample.The results show that as the strain rate increases,the yield strength exhibits a weaker normal strain rate sensitivity,reaching a maximum of 1585 MPa at 10^(2) ks^(-1);the fracture strength and plastic strain shows that the parabolic change law reaches the maximum at 10^(1) ks^(-1),which are 1984 MPa and 7.6%,respectively.The crystalline phase undergoes a martensite transformation after deformation,and multiple shear bands induced by the martensite transformation are formed in the amorphous matrix.The increase of strain rate can promote the occurrence of martensitic transformation and enhance the plasticizing effect of phase transformation.In amorphous alloys,the increase of strain rate will inhibit the initiation and proliferation of shear bands,showing a negative plasticity correlation.The coupling between the two determines the mechanical properties of amorphous composite materials.

关 键 词：非晶复合材料 应变速率 力学性能 塑性 形变诱发马氏体相变 

分 类 号：TG139.8[一般工业技术—材料科学与工程]