采用X射线、光学显微镜、电子探针、扫描电镜等手段研究了Sb合金化对AE41(Mg-4Al-1RE)镁合金组织和耐热性能的影响.结果表明,Sb取代Al优先与RE形成以RE2Sb相为主的高熔点弥散颗粒质点,而枝条状Al11RE3相数量和尺寸减小.Al11RE3相对基体的割裂作用的减弱,RE-Sb质点的弥散强化作用、以及Sb、RE等元素的固溶强化作用,使合金的常温和高温力学性能尤其是塑韧性显著提高,并且有效地改善了高温抗蠕变能力.过量的Sb反而降低了合金的力学性能和耐热性能.合金的断裂为具有塑性特征的准解理断裂.
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