Evolution of phase transformation behavior and mechanical properties with crystallization in NiTi thin films

被引：21
|
作者：
Huang, Xu [1 ]
San Juan, J. [2 ,3 ]
Ramirez, A. G. [1 ,3 ]
机构：
[1] Yale Univ, Dept Mech Engn, New Haven, CT 06520 USA
[2] Univ Basque Country, Dept Fis Mat Condensada, E-48080 Bilbao, Spain
[3] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
来源：
SCRIPTA MATERIALIA | 2010年 / 63卷 / 01期
基金：
美国国家科学基金会;
关键词：
Amorphous materials; Thin films; Crystallization; Nanoindentation; Mechanical properties; NANOINDENTATION; STRESS; TEMPERATURE; PLASTICITY;
D O I：
10.1016/j.scriptamat.2010.02.037
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The phase transformation and nanoindentation response as a function of crystallinity of NiTi thin films were assessed. A phase change was detectable in samples with 1% crystallization. Measured mechanical properties indicate that the films soften with crystallization. Films partway through crystallization presented a bimodal response: crystalline regions had moduli similar to fully crystallized films; and amorphous regions had larger moduli (larger than as-deposited amorphous films) attributable to structural relaxation. A modified Voigt model describes the evolution of the modulus in crystallizing films. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：16 / 19
页数：4
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