Atomic scale processes of phase transformations in nanocrystalline NiTi shape-memory alloys

被引：199

作者：

Ko, Won-Seok ^{[1
,2
]}

Maisel, Sascha B. ^{[2
]}

Grabowski, Blazej ^{[2
]}

Jeon, Jong Bae ^{[3
]}

Neugebauer, Joerg ^{[2
]}

机构：

[1] Univ Ulsan, Sch Mat Sci & Engn, Ulsan 44610, South Korea

[2] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[3] Korea Inst Ind Technol KITECH, Funct Components & Mat R&D Grp, Busan 618230, South Korea

来源：

ACTA MATERIALIA | 2017年 / 123卷

基金：

欧洲研究理事会; 欧盟地平线“2020”;

关键词：

Shape-memory alloy; Nickel-titanium; Nanocrystalline material; Phase transformation; Molecular dynamics simulation; MOLECULAR-DYNAMICS; GRAIN-SIZE; MARTENSITIC-TRANSFORMATION; SIMULATION;

D O I：

10.1016/j.actamat.2016.10.019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Molecular dynamics simulations are performed to investigate temperature- and stress-induced phase transformations in nanocrystalline nickel-titanium shape-memory alloys. Our results provide detailed insights into the origins of the experimentally reported characteristics of phase transformations at the nanoscale, such as the decrease of the transformation temperature with grain size and the disappearance of the plateau in the stress-strain response. The relevant atomic scale processes, such as nucleation, growth, and twinning are analyzed and explained. We suggest that a single, unified mechanism dominated by the contribution of a local transformation strain explains the characteristics of both temperature- and stress-induced phase transformations in nanocrystalline nickel-titanium. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd.

引用

页码：90 / 101

页数：12

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