Al-3Cu-0.5Sc合金高温变形的本构关系(英文)  

Constitutive relationship for high temperature deformation of Al-3Cu-0.5Sc alloy

作　　者：徐国富[1,2,3] 彭小燕[1] 梁霄鹏[2] 李旭[1] 尹志民[1,3] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《中国有色金属学会会刊：英文版》2013年第6期1549-1555,共7页Transactions of Nonferrous Metals Society of China

基　　金：Project(2005CB623705)supported by the National Basic Research Program of China;Project(51312010402)supported by the National Defence Pre-research Foundation of China

摘　　要：采用Gleeble-1500热/力模拟试验机研究Al-3Cu-0.5Sc合金在温度为350～500℃、应变速率为0.01～10s-1条件下的高温压缩变形行为。利用经摩擦修正和温度补偿修正后的流变应力曲线建立合金的本构方程,温度和应变速率对变形行为的影响可使用包含Zener-Holloman参数的指数方程来描述。通过考虑应变对材料常数的影响,建立包含真应变的本构方程;其真应变对本构方程的影响规律,可通过材料常数的四次多项式拟合来实现。The high temperature compressive deformation behavior of Al?3Cu?0.5Sc alloy was investigated at temperatures from 350 to 500 °C, and strain rates from 0.01 to 10 s?1 with the Gleeble?1500 thermo-mechanical simulator machine. The flow curves after corrections of the friction and temperature compensations were employed to develop constitutive equations. The effects of temperature and strain rate on deformation behaviors were represented by Zener-Hollomon parameter in an exponent type equation. The influence of true strain was incorporated in the constitutive equation by considering the effect of true strain on material constants. A four-order polynomial is found to be suitable to represent the influence of strain on the constitute equations.

关 键 词：Al-3Cu-0.5Sc合金 本构关系 高温变形 

分 类 号：TG132.32[一般工业技术—材料科学与工程]