Influence of Thermomechanical Treatment on Structure and Crack Propagation in Nanostructured Ti-50.26 at%Ni Alloy

被引：5
作者：
Kreitcberg A. [1 ,2 ]
Brailovski V. [1 ]
Prokoshkin S. [2 ]
Inaekyan K. [1 ]
机构：
[1] Ecole de Technologie Supérieure, Montreal, QC
[2] National University of Science and Technology MISIS, Moscow
来源：
Metallography, Microstructure, and Analysis | 2014年 / 3卷 / 01期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Electron microscopy; Failure analysis; Mechanical testing; Optical microscopy; Rolling;
D O I：
10.1007/s13632-013-0114-4
中图分类号：
学科分类号：
摘要：
The fatigue propagation of processing-induced microcracks in severely deformed Ti-50.26 at%Ni alloy's samples was investigated. The processing schedules included cold rolling (CR) with logarithmic strains of e{open} = 0.75 and 1.2, and a combination of CR(e{open} = 1), intermediate annealing (400 °C, 1 h), and warm rolling (e{open} = 0.2, T = 150 °C). The final step of the thermomechanical processing schedules consisted of post-deformation annealing at 400 °C, 1 h. The resulting microstructures were studied using transmission electron microscopy. Using optical microscopy, the processing-induced edge cracks' lengths and concentrations were measured before and after multicycle superelastic and stress generation/relaxation testing. From the functional fatigue point of view, nanocrystalline (NC) microstructure demonstrated higher tolerance to small cracks than mixed NC + nanosubgrained structure. © 2014 Springer Science+Business Media New York and ASM International.
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收藏
页码：46 / 57
页数：11
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