热处理对LY12合金微塑变抗力的影响  

Effects of Heat Treatment on Resistance to Microplastic Deformation in LY12 Alloy

作　　者：张帆[1] 李小璀[1] 孙鹏飞[1] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200030

出　　处：《金属热处理》2000年第4期5-6,共2页Heat Treatment of Metals

基　　金：国家自然科学基金资助项目 !(59871027)

摘　　要：研究了LY12合金在多种热处理制度下的微塑变抗力 ,发现退火、淬火态的微塑变抗力很低 ,循环态次之 ,时效态最高。在时效过程中析出的S’强化相能显著提高微塑变抗力 ,具有典型峰时效规律。循环处理对低应变下的微塑变抗力有利 。Microplastic deformation behavior of LY12 alloy under several typical heat treatment conditions has been investigated in this work.The results showed that the resistance to microplastic strain( σ p) of annealed specimens was lower,subsequent was the quenched,the aged and thermal cycled specimens presented higher σ p.During aging treatment the σ p exhibited “peak aging”changing tendency,suggesting that the microyield strength,as conventional yield strength,is also controlled by the dispersed strengthening phase S’.Thermal cycling treatment decreased the resistance to higher magnitude of plastic strain ( σ 10 -4 , σ t),but increased that of lower magnitude of plastic strain ( σ 10 -6 ).

关 键 词：LY12合金 微塑性变形 热处理 铝合金 微塑变抗力 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]