(上海交通大學教育部高溫材料及高溫測試開放實驗室, 上海 200030;
*香港城市大學物理及材料科學系， 香港九龍)
摘 要: 應用TEM研究了L12長程有序結(jié)構(gòu)Ni74.5Pd2Al23.5合金的室溫變形組織。研究結(jié)果表明：添加Pd元素韌化的Ni74.5Pd2Al23.5合金的變形組織中存在著大量超點陣內(nèi)稟層錯。絕大部分層錯的邊界位錯是沿〈011〉分布的肖克萊偏位錯環(huán)，其中30°的a/3〈112〉超肖克萊位錯處于固定狀態(tài)。這類位錯的可動性較差，但其固定程度較合金中普遍存在的Kear-Wilsdorf固定位錯要弱．
關(guān)鍵字: 層錯 位錯 金屬間化合物
（Open Laboratory for High Temperature Materials and Tests,Shanghai Jiao Tong University, Shanghai 200030, P. R. China;
*Department of Physics and Materials Science, City University of Hong Kong）
Abstract:Many Superlattice intrinsic stacking faults were observed by TEM in an L12 ordered Ni74.5Pd2Al23.5 alloy after deformation at room temperature. Most of the partial dislocations bounding the faults are elongated loops oriented at <011>. The 30° super Schockley partials exist as locking dislocations with low mobility, however, they are not so strong as the Kear-Wilsdorf lockings observed also in the deformed alloy.
Key words: stacking faults dislocations intermetallic compound
