Effects of zinc on creep strength and deformation substructures in Mg–Y alloy
Effects of zinc on creep strength and deformation substructures in Mg–Y alloy
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DOI：
10.1016/j.msea.2003.12.071
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发表时间：
2004-12
期刊：
影响因子：
6.4
通讯作者：
Mayumi Suzuki;T. Kimura;J. Koike;K. Maruyama
中科院分区：
文献类型：
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作者：
Mayumi Suzuki;T. Kimura;J. Koike;K. Maruyama
研究了热轧Mg-Y二元合金和Mg-Y-Zn三元合金在650 K下的压缩蠕变行为。Zn的加入显著提高了Mg-Y合金的蠕变强度。在Mg-Y-Zn合金中，即使添加0.02mol%的Zn，在高温下也会在（0001）晶面上形成许多“面缺陷”。钇和锌的同时加入降低了层错能，并使基面上的许多a位错扩展。扩展位错的分离宽度由钇和锌的偏聚稳定，并且在不同基面上的部分位错的相互作用下分离宽度显著增加。Mg-Y-Zn合金优异的蠕变强度是由于这些广泛延伸的位错的活动性降低所致。
Compressive Creep behavior of a hot-rolled Mg–Y binary alloy and Mg–Y–Zn ternary alloys was investigated at 650K. Creep strength of Mg–Y alloys was significantly improved by the addition of zinc. In Mg–Y–Zn alloys, many “planar faults” were formed on (0001) matrix planes at high temperatures even with small addition of 0.02mol% zinc. The stacking fault energy decreased by the simultaneous addition of yttrium (Y) and zinc and many a-dislocations on basal planes were extended. The separation width of the extended dislocations is stabilized by the segregation of yttrium and zinc and the separation width significantly increases under the interaction of partial dislocations on different basal planes. The excellent creep strength in Mg–Y–Zn was explained by the decrease of the mobility of these widely extended dislocations.