Ductility enhancement and superelasticity in Fe-Ni-Co-Al-Ti-B polycrystalline alloy

被引：60
|
作者：
Lee, Doyup [1 ]
Omori, Toshihiro [1 ]
Kainuma, Ryosuke [1 ]
机构：
[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 617卷
关键词：
Shape memory; Microstructure; Precipitation; Mechanical properties; MEMORY; TEXTURE;
D O I：
10.1016/j.jallcom.2014.07.136
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The microstructure, martensitic transformation and superelasticity were examined in Fe-30Ni-15Co-10Al-2.5Ti-0.05B polycrystalline alloy sheets. Thermoelastic transformation was obtained in an aged specimen at 550 degrees C with the gamma (FCC) + gamma' (L1(2)) structure. Moreover, it was found that a {012}< 100 > recrystallization texture was formed and that the high fraction of low energy boundaries was increased in a 98.5% cold-rolled specimen. Suppression of brittle precipitation during aging was directly observed at those boundaries, resulting in improvement of ductility, and superelastic strain of over 4% was obtained in the polycrystalline alloy in a tensile test at room temperature. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：120 / 123
页数：4
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