摘要
The negative creep during compressive creep deformation of as cast ZA27 alloy was investigated at the temperature range of 20160 ℃ and at compressive stress levels from 50137.5 MPa with special apparatus. Results show that the negative creep in the alloy occurred respectively at 20 ℃ (50 MPa, 87.5 MPa and 100 MPa), 60 ℃(50 MPa and 87.5 MPa) and 100 ℃(50 MPa). 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.
The negative creep during compressive creep deformation of as-cast ZA27 alloywas investigated at the temperature range of 20 - 160 deg C and at compressive stress levels from50 - 137.5 MPa with special apparatus. Results show that the negative creep in the alloy occurredrespectively at 20 deg C (50 MPa, 87.5 MPa and 100 MPa), 60 deg C (50 MBa and 87.5 MPa) and 100 degC (50 MBa). According to the phase transformation and theoretical analysis, the negative creepresulted from volume expansion caused by four-phase transformation a + epsilon -> T' + eta in thealloy. The theoretical analysis is consistent with the experiment results. And the values ofnegative creep depended on the difference between the compressive creep deformation and the volumeexpansion.
出处
《中国有色金属学会会刊：英文版》
CSCD
2003年第2期339-343,共5页
Transactions of Nonferrous Metals Society of China
关键词
ZA27合金
锌铝合金
蠕变
压缩蠕变
负蠕变
ZA27 alloy
compressive creep
negative creep
four-phase transformation
