Microstructural investigations into the low cycle fatigue deformation of a Cu-Cr-Zr-Ti alloy
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- 作者：A. Nagesha ; P. Parameswaran ; A. Biswas ; R. S ; hya ; A.K. Asraff ; M.D. Mathew
- 关键词：Cu&ndash ; Cr&ndash ; Zr&ndash ; Ti alloy ; Low cycle fatigue ; Secondary hardening ; Thermal ageing ; Dynamic strain ageing
- 刊名：Materials Science and Engineering: A
- 出版年：2013
- 出版时间：10 October, 2013
- 年：2013
- 卷：582
- 期：Complete
- 页码：91-95
- 全文大小：2276 K
文摘
Fully reversed axial strain controlled low cycle fatigue behaviour of a Cu-Cr-Zr-Ti alloy was investigated in the solution-annealed condition. Temperatures in the range, 300-900 K were employed for the tests which were carried out at a constant strain rate of 3¡Á10?3 s?1. The cyclic stress response was found to vary as a function of the test temperature, with a strong secondary hardening occurring in the range, 673-773 K which was associated with the formation of Cr-rich precipitates. Prior thermal ageing served to shift the cyclic stress response upwards and caused disappearance of the secondary hardening regime. Further, the serrations in the stress-strain hysteresis loops observed at the test temperature of 900 K remained absent in samples tested after the prior ageing treatment. The results are explained on the basis of microstructural observations.