Ti14合金半固态微观组织演变特征(英文)  

Microscopic Characterization of Semi-Solid Ti14 Alloy

作　　者：陈永楠[1] 魏建锋[2] 赵永庆[3] 马雪丹[3] 郝建民[1] 

机构地区：[1]长安大学,陕西西安710064 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [3]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》2012年第4期581-584,共4页Rare Metal Materials and Engineering

基　　金：National Basic Research Program of China(2005CCA06400);"973"Program(2007CB613807);Special Fund for Basic Scientific Research of Central Colleges,Chan'an Universty(CHD2010JC115)

摘　　要：采用热模拟系统研究半固态变形参数对合金微观组织演变和元素分布的影响,并讨论变形过程中的Ti2Cu析出行为。结果表明:微观组织,特别是Ti2Cu析出过程受变形参数影响较大;温度的增加,应变速率和变形量的降低将促进Ti2Cu在晶界的偏析,最终形成了网状晶界结构。分析认为:半固态晶界的析出过程主要受控于包晶反应,升温或降低其他变形参数将有利于液相在晶界的析出,形成晶界Cu元素富集区。液相的偏析和Cu元素的富集增加了该区域的包晶反应,最终在冷却过程中形成了粗大的网状晶界结构。The microstructural evolution and the element distribution of Ti14（α＋Ti2Cu） alloy during semi-solid compres-sion were investigated.Moreover,the Ti2Cu precipitate behaviors were discussed in detail.The results show that the micro-structure,the number and distribution of Ti2Cu precipitates have significant dependence on the process parameters.More Ti2Cu will precipitate on grain boundaries at a higher deformation temperature,and/or a lower strain rate as well as defor-mation ratio,and finally a network structure is formed after deformation at 1100 °C.The precipitation on grain boundaries is found to be mainly controlled by peritectic reactions.The elevated temperatures resulted in more liquid along the prior grain boundaries,and a Cu-rich region is formed,finally.the ＂coarse＂ grain boundaries appear during re-solidification.

关 键 词：钛合金 半固态 微观组织演变 析出行为 

分 类 号：TG146.23[一般工业技术—材料科学与工程]