中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 13 No. 2 April 2003 |
as-cast ZA27 alloy
（1. Department of Metal Materials,
Sichuan University, Chengdu 610065, China;
2. Department of Materials Science and Engineering,
Sichuan Institute of Technology, Chengdu 610039, China）
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.
附件: yw2003-02-24
Key words: ZA27 alloy; compressive creep; negative creep; four-phase transformation
