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几种纳米固体材料的显微结构特征

平德海 , 李斗星 , 叶恒强 , 吴希俊

金属学报

本文利用高分辨电镜（ＨＲＥＭ）对两种不同方法制备的纳米固体材料的微观结构进行了研究．结果表明，在惰性气体凝聚加原位加压法制备的纳米固体Ｐｄ中，晶界上既有有序的区域，同时又存在局部不完整或无序的区域以及纳米级的空洞，而且晶粒内部及晶界区存在大量的缺陷．在非晶晶化制备的Ｔｉ－Ｎｉ－Ｓｉ和Ｆｅ－Ｍｏ－Ｓｉ－Ｂ纳米合金中，晶界基本上为有序结构，没有明显的无序区或纳米空洞存在，缺陷的密度也较低．在两种不同方法制备的纳米固体中，晶界都呈现出弯曲的特征，而且邻近晶界的区域存在点阵畸变．

关键词: 纳米固体材料 , grain boundary , defect , high resolution electron microscopy

ATOMIC SCALE MECHANISM OF RESTRAINED EMBRITTLEMENT IN AMORPHOUS Fe_(78)B_(13)Si_9 ALLOY BY ELECTRIC PULSE RAPID ANNEALING

J.L. Huang , X.G. Cao , E. Sukedai , S. Yamasaki , and H.C.Gu(Department of Materials Engineering , Luoyang Institute of Technology , Luoyang 471039 , China)(Department of Mechanical Engineering , Okayama University of Science , 1-1 Ridai-Cho , Okayama City , Okayma 700 , Japan)(Institute of Materials Science and Engineering , Xi'an Jiaotong University , Xi'an 710049 , China)

金属学报(英文版)

The direct observations of the atomic arrangements in both conventional furnace annealed and electric pulse rapid annealed Fe78B13Si9 amorphous alloy have been conducted by the lattice imaging technique in a higt resolution electron microscope. The results showed that the embrittlement of the alloy was related to the extent of atomic rearrangements during the annealing processes. The embrittlement of the alloy after 1hour conventional furnace annealing at about 270℃ is caused by the sufficient atomic rearrangements which are characterized by the growth of some bct Fe3B-like atomic short range ordering regions already existed in the as-quenched structure. Electric pulse rapid annealing can effectively retard the above-mentioned atomic rearrangements and thus restrain the embrittlement. The embrittlement only occurs when certain amount of bcc α-Fe nanocrystals are precipitated in the amorphous matrix during electric pulse rapid annealing.

关键词: Fe_(78)B_(13)Si_9 amorphous alloy , null , null , null

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