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采用自制实验装置研究了铸态Mg-4Al-2RE合金在温度125~175℃、压力88~112MPa的压缩蠕变行为,利用扫描电镜、X射线衍射仪和能谱分析仪对该合金压蠕变前后的组织形貌和相成分进行了分析。结果表明:随温度和应力的升高,合金的压蠕变量增大。Mg-4Al-2RE合金铸态组织为α-Mg基体、Al11Nd3相和Al2Nd相;高温压蠕变时Al11Nd3相不稳定易发生分解,使晶界原子扩撒加剧,晶界明显滑移,致使合金的抗高温蠕变性变差。在175℃、100~112MPa条件下,该合金快速进入加速蠕变阶段,出现了沿晶蠕变断裂现象。
The creep behavior of as-cast Mg-4Al-2RE alloy at 125 ~ 175 ℃ and pressure of 88 ~ 112MPa was studied by self-made experimental equipment. The creep behavior of the alloy was studied by scanning electron microscopy, X-ray diffraction and energy spectrum analyzer Before and after the organization and phase components were analyzed. The results show that with the increase of temperature and stress, the creep creep of the alloy increases. The as-cast microstructure of Mg-4Al-2RE alloy is α-Mg matrix, Al11Nd3 phase and Al2Nd phase. At high temperature creep, Al11Nd3 phase is unstable and easily decomposed, which causes the atomic diffusion of grain boundary and the grain boundary to slide obviously, The resistance to high temperature creep worse. At 175 ℃, 100 ~ 112MPa conditions, the alloy quickly entered the accelerated creep stage, along the crystal creep rupture.