温度对α+Ti_2Cu钛合金半固态偏析行为和锻造机理的影响（英文）  

Effect of Temperature on Segregation and Deformation Mechanism of α+Ti_2Cu Alloy during Semi-Solid Forging

作　　者：陈永楠[1] 雒创 张凤英[1] 魏建锋[2] 赵永庆[3] 

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》2015年第6期1369-1373,共5页Rare Metal Materials and Engineering

基　　金：National Key Basic Research Development Program of China("973"Program)(2007CB613807);National Natural Science Foundation of China(51201019);the Special Fund for Basic Scientific Research of Central Colleges(2013G3314002)

摘　　要：以新型阻燃钛合金Ti14(α+Ti2Cu)为对象,研究了合金在不同温度半固态锻造过程中的偏析和偏聚现象及由此导致的变形机制的变化。结果表明,半固态温度影响液相含量和分布,随着温度的升高液相在晶界由不连续分布转变为连续分布析出,并最终形成了网状结构分布。锻造过程中由于液相和应力的共同作用出现了宏观偏析现象,液相在压力作用下的流动在晶界处产生了宏观液相/固相分离现象,靠近试样中心固相离子集中;这种现象导致了锻造过程中变形机制的变化,中心区仍旧是固相粒子的塑性变形为主变形机制,靠近试样外边缘主变形机制转变为固相粒子的相对滑移,通过唯象模型对其过程进行讨论。The segregation behavior and the deformation mechanism of Ti14,a new typical burn resistant α＋Ti2Cu alloy were investigated,during semi-solid forging at different temperatures.The results reveal that semi-solid temperature will affect the content and the distribution of liquid phase evidently.Upon increasing of temperature,the liquid phase distribution transforms from discontinuity to continuity at grain boundaries,and finally a type of net-structure is formed.Moreover,the macro-segregation of liquid and solid phases occurs during the semi-solid forging,which leads to a change of the main deformation mechanism from center to edge of the sample.The relationship of macro-segregation of liquid/solid phases and the main deformation mechanism was also discussed by a phenomenological model.

关 键 词：TI14合金 半固态锻造 偏析行为 变形机制 

分 类 号：TG146.23[一般工业技术—材料科学与工程]