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International Journal of Corrosion
Volume 2017 (2017), Article ID 2893276, 8 pages
https://doi.org/10.1155/2017/2893276
Research Article

Effect of Grain Size on the Stress Corrosion Cracking of Ultrafine Grained Cu-10 wt% Zn Alloy in Ammonia

Department of Mechanical Engineering, Doshisha University, Kyoto 610-0394, Japan

Correspondence should be addressed to Hiroyuki Miyamoto; pj.ca.ahsihsod.liam@tomayimh

Received 26 January 2017; Accepted 11 June 2017; Published 18 July 2017

Academic Editor: Jerzy A. Szpunar

Copyright © 2017 Takuma Asabe et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of grain size in the micron to submicron range on the stress corrosion cracking (SCC) of Cu-10 wt% Zn alloys was investigated using constant-load tests in ammonia vapor. The grain size was systematically varied from 4 μm to 0.12 μm by either cold-rolling or equal-channel angular pressing (ECAP), followed by annealing. The time to fracture increased with decreasing grain size above 1 μm but then began to decrease with decreasing grain size into the submicron range. This inverse trend in the submicron range is discussed in terms of a severe plastic deformation- (SPD-) induced ultrafine grain microstructure.