Negative creep during compressive creep of as-cast ZA27 alloy

来源期刊：中国有色金属学报(英文版)2003年第2期

论文作者：魏晓伟 沈保罗 易勇

文章页码：339 - 343

Key words：ZA27 alloy; compressive creep; negative creep; four-phase transformation

Abstract: The negative creep during compressive creep deformation of as-cast ZA27 alloy was investigated at the temperature range of 20-160℃ and at compressive stress levels from 50-137.5MPa with special apparatus. Results show that the negative creep in the alloy occurred respectively at 20℃(50MPa, 87.5MPa and 100MPa), 60℃(50MPa and 87.5MPa) and 100℃(50MPa). According to the phase transformation and theoretical analysis, the negative creep resulted from volume expansion caused by four-phase transformation α+ε→T′+η in the alloy. The theoretical analysis is consistent with the experiment results. And the values of negative creep depended on the difference between the compressive creep deformation and the volume expansion.