大晶粒含钛Fe－36．5Al基合金的超塑性研究  

SUPERPLASTICITY IN LARGE-GRAINED Fe-36.5Al BASED ALLOYS ADDED Ti

作　　者：郦定强[1] 刘毅[1] 单爱党[1] 林栋梁[1] 

机构地区：[1]上海交通大学

出　　处：《金属学报》1996年第4期417-422,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金

摘　　要：通过对未加Ｔｉ及加有不同量Ｔｉ的Ｆｅ－３６．５Ａｌ（原子分数，％）基合金的高温变形行为的研究，发现加Ｔｉ的合金在９００—１０００℃，初始应变速率为２．０８×１０￣（－４）－８．３３×１０￣（－２）ｓ￣（－１）范围内比未加Ｔｉ的ＦｅＡｌ合金的延伸率有较大幅度提高，且应变速率敏感性指数ｍ值普遍超过０．３。随含Ｔｉ量的增加，ｍ值及延伸率也普遍提高，最高值分别达到０．４３和２９７％．金相及ＴＥＭ分析表明，变形过程中出现了明显的晶粒细化及亚晶形成过程，并由此导致了大晶粒含钛ＦｅＡｌ基合金的超塑性。High temperature deformation behaviours of a binary FeAl compound and FeAl based alloys added different Ti contents have been investigated. The elongations of FeAl-Ti alloys were larger than that of the binary FeAl compound under an initial strain rate range of 2.08×10￣(-4)-8.33×10￣(-2) s￣(-1), tested at 900-1000℃. The strain rate sensitivity index, m, is over 0.3 commonly. With the increase in Ti content in FeAl alloys, m value and elongation increase significantly. The maximum m value and the maximum elongation were up to 0.43 and 297% respectively. Microstructure analyses and TEM graphs show that grains became fine and subboundaries were formed during superplastic deformation, which resulted in the superplasticity in large grained FeAl-Ti alloys.

关 键 词：金属间化合物 大晶粒 超塑性 铁铝合金 

分 类 号：TG131[一般工业技术—材料科学与工程]