不同半固态加工变形量的Ti14合金的微观组织和晶界特征  

Research on the Microstructure and Grain Boundary Characteristic of Ti14 Alloy after Semi-Solid Deformation

作　　者：陈永楠[1] 魏建锋[1] 赵永庆[2] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2008年第5期762-765,共4页Rare Metal Materials and Engineering

基　　金：重大基础研究前期研究专项项目(2005CCA06400);国家“863”项目(2002AA336040)

摘　　要：研究了Ti14合金半固态加工变形过程中合金组织的演变规律及晶界特征,探讨了不同变形量下晶粒长大的机制及晶界变化规律。结果表明:加工变形过程改变了液相的分布,使得液相沿晶界向试样表面流动;当变形量在45%～60%时,宏观组织粗大,晶界清晰,晶粒以Ostwald熟化机制长大;当变形量超过75%后,晶界细化并出现不连续晶界,晶粒以合并长大机制为主,遵循位向择优原则;变形过程中改变了晶界的界面能,促使晶界发生迁移和转动,导致弯曲的晶界向其曲率中心方向移动,三叉晶的交角向120°趋近。The microstructures evolution and grain boundaries characteristic of Ti14, a new typical α＋Ti2Cu alloy, after semi-solid forging with different deformation amount were investigated. The results reveal that the deformation amount has an effect on the energy and distribution of grain boundaries. The grain became coarse and the grain boundaries became discontinues with the increasing of deformation amount, which led to transition of grain growth mechanism from Ostwald growth to combination growth. The change of interfacial energy led to the grain boundary migration and rotation, which induces grain boundary bend to center of curvature and the angular grain boundary turn to 120°.

关 键 词：TI14合金 半固态加工变形 微观组织 晶界特征 

分 类 号：TG146.23[一般工业技术—材料科学与工程]