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作 者:张久文[1] 陈荣石[2] 周文龙[1] 韩恩厚[2]
机构地区:[1]大连理工大学材料工程系,辽宁大连116023 [2]中国科学院金属研究所,辽宁沈阳110016
出 处:《材料科学与工艺》2007年第1期141-144,共4页Materials Science and Technology
基 金:国家高科技发展计划资助项目(2002AA331120);辽宁省博士启动基金资助项目(20031076)
摘 要:研究了挤压AM50(-Ca)镁合金的微观组织和力学性能.研究发现添加钙在AM50合金中生成新的Al2Ca相,并细化合金的晶粒尺寸.大于2wt.%的钙使铸态AM50的晶粒尺寸从200μm减小到40μm,使挤压态AM50的晶粒尺寸从15μm减小到7.5μm.含钙量较少时,晶粒内仍含有少量的Mg17Al12相,Al2Ca相主要分布在晶界;含钙量多于2wt.%时,合金中的Mg17Al12完全消失,除晶界处的Al2Ca相外,在晶粒内部出现大量的针状Al2Ca相.加钙提高了AM50合金的低温抗拉强度,同时在所有试验温度下合金的屈服强度得到提升.The effects of Ca addition on the microstructure and mechanical properties of the extruded AM50 magnesium alloy have been studied. The results show that the Ca addition can reduce the quantity of Mg17Al12phase and form a new A12Ca phase distributing along grain boundaries. When Ca is added with an amount of more than 2wt. %, needle -shaped Al2Ca precipitates are observed inside grain interiors, and the grain sizes of both as -cast and as - extruded AM50 alloy are decreased from 200μm and 15μm to 40μm and 7. 5μm, respectively. It is found that the yield strength of the extruded AM50 alloy are improved with increasing Ca content in the studied temperature range, while the improvement in ultimate strength can be observed only at low temperature.
分 类 号:TG146.22[一般工业技术—材料科学与工程]
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