Effect of a pre-aging treatment on the mechanical behaviors of Ni50.3Ti49.7 - xHfx (x ≤ 9 at.%) Shape memory alloys

被引：27

作者：

Amin-Ahmadi, Behnam ^{[1
]}

Gallmeyer, Thomas ^{[1
]}

Pauza, Joseph G. ^{[1
]}

Duerig, Tom W. ^{[2
]}

Noebe, Ronald D. ^{[3
]}

Stebner, Aaron P. ^{[1
]}

机构：

[1] Colorado Sch Mines, Mech Engn, Golden, CO 80401 USA

[2] Confluent Med Technol, Fremont, CA 94539 USA

[3] NASA, Glenn Res Ctr, Mat & Struct Div, Cleveland, OH 44135 USA

来源：

SCRIPTA MATERIALIA | 2018年 / 147卷

关键词：

Aging; NiTiHf shape memory alloy; Transmission electron microscopy (TEM); Precipitation; H-phase; Superelasticity; NI-RICH NITIHF; PRECIPITATE PHASE;

D O I：

10.1016/j.scriptamat.2017.12.024

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Transmission electron microscopy and mechanical testing were used to determine the effect of pre-aging (300 degrees C for 12 h) on microstructure and mechanical behavior of a series of Ni50.3Ti49.7 - xHfx, shape memory alloys (x = 6, 8, 8.5, 9 at.%) prior to normal aging at 550 degrees C for 3.5 h. Pre-aging was found to promote homogenous nucleation of nanosized H-phase precipitates, resulting in improved mechanical stability and strength and 4% recoverable compression strain without permanent deformation. The absence of pre-aging generally resulted in heterogeneous formations of larger H-phase precipitates, primarily clustered along grain boundaries, and correlated with poorer mechanical behavior. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：11 / 15

页数：5

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