【摘要】 研究了合金元素Ｂｉ对Ｍｇ９Ａｌ０．８Ｚｎ（ＡＺ９１）基合金显微组织和力学性能的影响，结果表明Ｂｉ质量分数超过０．５％时，基体中有富Ｂｉ的第二相颗粒形成，并随着Ｂｉ加入量的增多而增加，该颗粒相具有六方Ｄ５２结构，热稳定性较高，适量Ｂｉ的加入改善了合金的铸态组织，提高了合金的室温和高温强度，改善了抗蠕变性能，而塑性有所降低．更多还原

【Abstract】 Effects of bismuth additions on the mechanical properties of Mg9Al0.8Zn(AZ91) alloys were studied. Results show that bismuth additions exceeded 0.5% to AZ91 alloys caused the formation of Mg 3Bi 2 precipitates with hexagonal D5 2 structure which strengthened the AZ91 alloy at both ambient and elevated temperatures so that the tensile strength and creep resistance were significantly improved.更多还原