高应变速率下钛-钢复合板界面组织特征及变形机制

发布时间：2018-06-20 15:54

本文选题：钛-钢复合板 + 高应变速率　；参考：《工程科学学报》2017年07期

【摘要】：在高应变速率下,钛-钢复合板不同材料以不同的变形机制协调变形,结合界面起到至关重要的作用.本文分析研究了高应变速率下钛-钢复合板的界面组织特征和变形机制.结果表明:在钢侧,随着应变速率的提高,小角度(3°~10°)晶界含量增多,织构组分{112}〈241〉逐渐演变为织构{665}〈386〉和{111}〈110〉.在钛侧,随着应变速率的提高,出现了明显的形变孪晶组织,三种形变孪晶如{1121}〈1100〉拉伸孪晶、{1122}〈1123〉压缩孪晶和{1012}〈1011〉拉伸孪晶产生的难易程度不一样,变形机制由常规的"孪生变形为主"转变为"位错滑移与孪生变形共存"的复合变形模式.在结合界面处,随着应变速率的提高,需要适应由两侧产生的不同变形抗力,才能够实现连续变形而不致使材料发生破坏,其主要的协调机制依靠结合界面及附近晶粒的滑移实现变形.
[Abstract]:At high strain rate, different materials of Ti-steel composite plate coordinate deformation with different deformation mechanisms, and the interface plays an important role. In this paper, the interfacial microstructure and deformation mechanism of Ti-steel composite plate at high strain rate are analyzed and studied. The results show that the grain boundary content increases with the increase of strain rate, and {112} < 241 > evolves into {665} < 386 > and {111} < 110 >. On the titanium side, with the increase of strain rate, there are obvious deformation twins, such as {1121} < 1100 > tensile twins, {1122} < 1123 > compression twins and {1012} < 1011 > tensile twins. The deformation mechanism is changed from "twinning deformation mainly" to "dislocation slip and twinning deformation coexistence". At the interface, with the increase of strain rate, it is necessary to adapt to the different deformation resistance produced by both sides in order to realize continuous deformation without causing damage to the material. Its main coordination mechanism depends on the slip of the interface and the nearby grains to realize the deformation.
【作者单位】：北京科技大学工程技术研究院;
【分类号】：TB331

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