γ－TiAl单晶位错滑移特性的研究  

INVESTIGATION OF DISLOCATIONS SLIP CHARACTERISTIC IN A γ TiAl SINGLE CRYSTAL

作　　者：陈小群[1] 黄伯云[1] 贺跃辉[1] 曲选辉[1] 

机构地区：[1]中南工业大学粉末冶金研究所

出　　处：《中南工业大学学报》1996年第5期547-550,共4页Journal of Central South University of Technology(Natural Science)

基　　金：国家自然科学基金

摘　　要：利用透射电子显微术对Ｔｉ－５６％Ａｌ（原子分数）单晶变形亚结构中位错的滑移特性进行了研究．结果表明：γ－ＴｉＡｌ相单晶在室温下，沿［１１２］方向受力产生的可动位错系为｛１１１｝１／２〈１１２］型超位错，位错滑移方向为〈１１０］或〈１３２］；位错线轴向处于〈１１０］或〈１３２］方向的部分由于受到Ｐｅｉｅｒｌｓ应力势的限制而变为难滑移部分。Slip characteristic of dislocations in a γ TiAl single crystal with the orientation deformed at room temperature was observed by transmission electron microscopy. The results indicated that only super dislocations with 1/2〈112] type Burgers vector can operate. Slip directions of dislocations were 〈110] or 〈132] directions. Parts of dislocation with their axes at right angles to directions 〈110] or 〈132] could be sessile as a result of entrance in. The result of the dislocation continuously moving caused a couple of dislocations lines with straight morphology along the 〈110] or 〈312] direction.

关 键 词：TiAl单晶 位错 溅移特性 铝合金 金属间化合物 

分 类 号：TG146.21[一般工业技术—材料科学与工程]