【摘要】 采用SEM、EDX对Al RE Cu Mn Si铸造铝合金的高温性能进行了研究 ,分析了合金微观组织形貌特征和相的成分特点。结果表明 ,该合金在 3 5 0～ 40 0℃高温下力学性能未有明显下降 ,比一般耐热铝合金的承温能力明显偏高 ,这与合金中含有高温稳定的稀土化合物相直接相关 ,该化合物在晶界和枝晶间分布对高温塑性滑移有明显的阻碍作用更多还原

【Abstract】 The microstructure and phase components of aluminum alloy Al-RE-Cu-Mn-Si were investigated by SEM and EDX. The result shows that with increasing of temperature mechanical property at 350～400℃ decreased but not obviously, heat-resisting capacity of the alloy is higher than common heat-resisting aluminum alloy. It was found that rare earth compound phases at grain boundary and inter-dendritic distributed perform hindrance action to plastic slide.更多还原