Ta对一种镍基单晶合金微观组织及蠕变机制的影响  

Effects of Ta on Microstructure and Creep Mechanism of a Ni-Base Single Crystal Superalloy

作　　者：孙跃军[1] 张军[2] 

机构地区：[1]辽宁工程技术大学,辽宁阜新123000 [2]中国科学院力学研究所,北京100190

出　　处：《稀有金属材料与工程》2012年第9期1615-1618,共4页Rare Metal Materials and Engineering

摘　　要：利用螺旋选晶法制备不同Ta含量的镍基单晶合金,研究Ta对合金微观组织及蠕变机制的影响。结果表明:Ta改变了合金中γ'相的形貌,随着Ta含量的提高,γ'相由椭圆形向方形转变;Ta促进了Mo在γ基体中的溶解,增大了合金的错配度;Ta对镍基单晶合金的高温蠕变寿命有较大影响,随着Ta含量的提高,合金的蠕变寿命增加;Ta促进了γ/γ'界面的位错网的发展与完善,影响了蠕变变形过程中位错的运动方式。Ni-base superalloys with different Ta contents were prepared by the screw selecting method. The effects of Ta on microstructure and creep mechanism of Ni-base single crystal superalloys were investigated. Results show that the morphology of y＇ phase changes from ellipse to square with the increasing of Ta content. Negative mismatch of the superalloy increases due to more Ta and Mo dissolved into y phase. The creep rupture time is prolonged and dislocation net in γ/γ＇ interface is improved when the content of Ta increases form 6wt% to 10wt%.

关 键 词：TA 镍基单晶合金 蠕变 错配度 位错网 

分 类 号：TG132.32[一般工业技术—材料科学与工程]