Nanocrystallization of NiTi shape memory alloys made amorphous by high-pressure torsion

被引：72
作者：
Peterlechner, M. [1 ]
Waitz, T. [1 ]
Karnthaler, H. P. [1 ]
机构：
[1] Univ Vienna, A-1090 Vienna, Austria
来源：
SCRIPTA MATERIALIA | 2008年 / 59卷 / 05期
关键词：
high-pressure torsion; in situ transmission electron microscopy (TEM); nanocrystallization; kinetics; NiTi shape memory alloy;
D O I：
10.1016/j.scriptamat.2008.05.004
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Almost complete amorphization is obtained in NiTi subjected to high-pressure torsion (HPT). Nanocrystallization occurs more than 100 degrees C lower than in amorphous sputtered and melt spun NiTi. This is caused by medium-range-ordered debris surviving HPT and triggering nanocrystallization. A high nucleation rate and low growth rate result from in situ heating transmission electron microscopy experiments. The kinetics of the heterogeneous nanocrystallization differs significantly from that leading to coarse grains. Therefore, HPT allows the nanostructure to be tailored to enhance shape memory properties. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：566 / 569
页数：4
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