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金属学报  2006 

Mg-6Al-(Sr,Ca)合金的显微组织和蠕变性能

, PP. 1267-1273

Keywords: Mg-Al-(Sr,Ca)合金,压铸,水冷模铸造

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Abstract:

陶卫健,刘海峰//金属学报.—2006;42(12).1267?1273系统研究了Mg-6Al-2Sr和Mg-6Al-(1-2)Sr-1Ca合金在水冷模铸造和压铸态下的显微组织、力学及蠕变性能.Mg-6Al-2Sr合金的铸态组织由?-Mg和沿枝晶界分布呈片状的?-Mg+Al4Sr共晶相组成.在Mg-6Al-2Sr基础上加入少量的Ca,合金中的Al4Sr被Mg2Ca取代,且出现了Mg-Al-Sr三元中间相,合金的抗蠕变性能显著提高.对蠕变后试样进行的扫描电镜观察表明,Mg-6Al合金中添加Sr和Ca后形成的中间相均具有很高的热稳定性.Mg-6Al-2Sr合金蠕变后的试样中出现了?-Mg17Al12相的非连续析出;而采用Sr和Ca复合合金化的试样显微组织在蠕变后无明显变化,也未析出?相,因而显著地提高了合金的抗蠕变性能.与水冷模铸造试样相比,压铸试样具有更细的显微组织和更高的室温与高温力学性能,但抗蠕变性能略低.

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