摘要
采用自制的蠕变试验装置研究了AE42（Mg-4Al-2RE）合金在温度为125~175℃（398~448K）、压力为88~112 MPa范围内的压缩蠕变行为,并采用回归法建立了该合金的压缩蠕变本构方程。结果表明：随着温度升高和压力增大,AE42合金的压缩蠕变应变和稳态蠕变速率都呈明显的上升趋势;在175℃（398K）、100~112 MPa条件下,合金进入加速蠕变阶段,出现蠕变断裂现象;AE42合金的压缩蠕变本构方程为εs=8.19×10-7σ5.39exp（-90 410/RT）,蠕变机制为晶界扩散主导的位错攀移机制。
The compressive creep behavior of Mg-4A1-2RE（AE42） alloy was investigated by using self-made creep test apparatus at temperatures of 125-175 ℃ （398-448 K） and compressive stresses of 88-112 MPa. In addition, the compression creep constitutive equation of the alloy was established by regression method. The results indicate that the compressive creep strain and steady state compressive creep rate is increased obviously with the increase of temperature and compressive stress. AE42 alloy enters the accelerated creep stage quickly and exhibites creep rupture character along grain boundaries under the conditions of 175 ℃ （398 K） and 100- 112 MPa. The compresmve creep constitutive equation of AE42 alloy is written as εs=8.19×10-7σ5.39exp（-90 410/RT）, the mechanism of dislocation climb determined by grain boundary diffusion is the main compressive creep mechanism.
出处
《机械工程材料》
CAS
CSCD
北大核心
2015年第5期85-88,92,共5页
Materials For Mechanical Engineering
基金
广西高校科研项目(YB2014432)
