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引言 Mg-Al 系镁合金具有较高的室温强度、优良的(3)

2013-04-25 01:29
　　2）200 ℃/56 MPa 条件下，由于Al2Ca 相的弥散分布及体积分数的增加对阻止晶界滑动非常有利。AM80-1.3Ca-0.5Sr 合金的蠕变性能最优，其稳态蠕变速率和100 h 蠕变量又分别低至1.7×10-9 s-1 和0.8%。但是由于AM80-1.3Ca-0.3Sr 合金中二次相呈长条状分布，降低了晶界强度，易导致应力集中效应，其蠕变性能出现大幅恶化。

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