Aging behavior and microstructural stability of a Cu-8Cr-4Nb alloy

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• 作者：A.K. Shukla ; S.V.S. Narayana Murty ; S.C. Sharma ; K. Mondal
• 关键词：Hot pressing ; Hot rolling ; Microstructural stability ; Grain growth ; Mechanical properties ; SEM
• 刊名：Journal of Alloys and Compounds
• 出版年：25 March, 2014
• 年：2014
• 卷：590
• 期：Complete
• 页码：514-525
• 全文大小：8956 K

文摘

The present work investigated microstructural stability and its concurrent effect on mechanical and electrical properties of hot-rolled Cu-8Cr-4Nb alloy samples at high temperatures (600, 800 and 1000 掳C) for holding durations up to 50 h. The hot-rolled samples were prepared from the near-theoretical-density hot-pressed alloy, which was made from gas-atomized powders. The hot-rolled alloy showed excellent retention of grain size due to pining of the grain boundaries, induced by the fine and homogeneously distributed stable Cr<sub>2sub>Nb dispersoids. The yield strength and ultimate tensile strength of the samples showed no appreciable change at 600 掳C and 800 掳C even after 50 h, whereas, YS and UTS dropped slightly on exposure of the sample to 1000 掳C for 50 h due to grain growth and coarsening of precipitates. The electrical conductivity of the samples remained almost unchanged with a slight improvement with prolonged exposure at higher temperatures.