Dynamic twinning stress and viscous-like damping of twin boundary motion in magnetic shape memory alloy Ni-Mn-Ga

被引：20

作者：

Saren, A. ^{[1
]}

Ullakko, K. ^{[1
]}

机构：

[1] Lappeenranta Univ Technol, Mat Phys Lab, Laitaatsillantie 3, Savonlinna 57170, Finland

来源：

SCRIPTA MATERIALIA | 2017年 / 139卷

基金：

芬兰科学院;

关键词：

Ferromagnetic shape memory; Twinning; Dynamic phenomena; Modeling; Ni-Mn-Ga; FIELD-INDUCED STRAIN; SINGLE-CRYSTALS; MARTENSITE; ACTUATION; NIMNGA;

D O I：

10.1016/j.scriptamat.2017.06.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We demonstrate a strong dependence of twinning stress (TS) on twin boundary (TB) velocity in Ni50Mn28Ga22 5M martensite. Different types of TBs exhibit substantially different dynamic properties under magnetic field actuation. For type 1 interface, the dynamic TS drastically increases from its quasi-static value of -0.6 to -3.2 MPa, limiting the TB velocity to 3-4 m/s at saturation magnetic driving force. Type 2 TBs show a gradual increase of the TS from -0.1 MPa to -2 MPa, reaching velocities of -35-39 m/s. Our findings bring to the fore type 2 interfaces for applications demanding high actuation speeds and frequencies. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：126 / 129

页数：4

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