项目名称: ECAP中fcc织构转变规律及其与微观组织演化的交互作用
项目编号: No.51261016
项目类型: 地区科学基金项目
立项/批准年度: 2013
项目学科: 一般工业技术
项目作者: 丁雨田
作者单位: 兰州理工大学
项目金额: 50万元
中文摘要: 单晶材料因缺乏晶界,不能定位初始晶界取向对晶界的演化以及晶界与剪切变形的交互作用,而多晶材料由于无法跟踪晶粒的初始取向,很难讨论初始取向和层错能对 FCC 金属ECAP形变组织和织构的影响。针对这一现象,本项申请在定向凝固技术以及等通道角挤压(ECAP)纯铜的研究基础上,研究具有不同层错能的定向凝固AL、Cu和Ag在ECAP中的组织与织构的交互作用。建立材料织构转变规律的 VPSC 模型,研究ECAP变形温升与动态再结晶、不同初始组织对形变组织和织构的取向效应。采用TEM、XRD、 EBSD和 DSC 等技术,重点分析位错组态和界面结构、特征织构晶群与微观组织的交互作用,深入研究形变织构组分的演变及取向稳定性,探明形变织构与微观组织的相关性。同时,考察材料的力学性能,明确塑性各向异性的微观机制。研究结果可以为ECAP制备块体超细晶材料和定向凝固技术制备不同单晶取向组合的杆材提供理论支持。
中文关键词: 织构;晶界;再结晶;层错能;取向效应
英文摘要: For lack of grain boundaries (GBs),Single crystal materials can't positioning the effect of initial GBs orientation on the evolution of the other GBs and the interaction of shear deformation on GBs, On the other hand, for can't follow the polycrystalline materials initial orientation, it is difficult to discuss the effect of stacking fault energy (SFE) and initial orientation on face center cubic (FCC) metals during equal channel angle pressing (ECAP). In reaction to the phenomenon, on the basis of study on the unidirectional solidification technology and ECAP pure copper, This application plan to study the interaction of microstructure and texture that has different SFE , AL, Cu and Ag, during ECAP. Set a VPSC model of the materials microstructure transformation law, research the ECAP deformation temperature rise and dynamic recrystallization, orientation effect of different initial microstructure on deformation configuration and texture. Using TEM, XRD, EBSD and DSC technology, analyses dislocation configuration and interface structure, interaction of the characteristic texture crystal group and microstructure, in-depth study the evolution of the orientation stability of deformation texture components, exploring the relevancy of deformation texture and microstructure. furthermore, investigation the materials m
英文关键词: texture;grain boundary;recrystallization;stacking fault energy;orientation effect