Al-Fe基合金的半固态压缩变形特性  

Compression Deformation Behavior of Al-Fe Alloy in Semi-solid State

作　　者：袁晓光[1] 张韶华[1] 刘波[1,2] 黄宏军[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110178 [2]浙江海洋学院船舶与建筑工程学院,舟山316000

出　　处：《机械工程学报》2010年第18期85-90,共6页Journal of Mechanical Engineering

基　　金：辽宁省创新团队计划(2006T104);辽宁省优秀人才支持计划(2008RC36)资助项目

摘　　要：Al-Fe基合金具有较好的耐热性,但力学性能差。利用半固态成形技术制备该合金,可以有效地提高合金的力学性能,使该合金具备应用价值。由于合金的半固态成形工艺与它在半固态条件下的变形行为密切相关,因此,系统地研究Al-Fe基合金半固态条件下的压缩变形行为,可以为该合金的半固态成形工艺制定提供依据。采用INSTRON-5500R型电子万能试验机进行压缩变形试验,研究不同变形速率、变形程度以及变形温度,对电磁搅拌的Al-Fe基合金在半固态条件下,真实应力与真实应变的变化规律。试验结果表明:变形速率不同时,随着变形速率的增加,变形抗力增加;变形程度不同时,随着变形程度的增加,合金的总应变增加,试样中心部位的晶粒尺寸有减小的趋势且液相比例明显减少,而试样的边缘则变化不明显;变形温度不同时,真实应力的峰值随变形温度的降低而急剧增大,稳态应力变化则较小,中心部位的晶粒尺寸随着变形温度的降低而减小,液相比例也随之减少。Al-Fe alloy has good heat-resisting property,but has poor mechanical properties.Semi-solid formation can improve the alloy mechanical properties and make the alloy have application value.Since the semi-solid formation technology is closely related to the deformation behavior of the alloy in semi-solid state,systematically studying on the compression deformation behavior can provide a basis for laying down semi-solid formation technology.The effects of deformation degree,rate and temperature on the changes of true stress and true strain of electromagnetic stirred Al-Fe alloy in semi-solid state are investigated through compression deformation test by using an INSTRON-5500R electronic universal testing machine.The results show that the deformation resistance increases with the increase of deformation rate,and with the increase of deformation degree,the total strain increases,the grain size of the specimen center part tends to reduce and the proportion of liquid phase decreases obviously,while the edge of the specimen has no obvious change.The peak value of the true stress increases sharply with the decrease of deformation temperature,while the steady-state stress changes slightly,and both the grain size of the center part and the proportion of liquid phase decrease.

关 键 词：半固态 AL-FE基合金 压缩变形 电磁搅拌 

分 类 号：TG3[金属学及工艺—金属压力加工]