Significance of stable and metastable phases in high temperature creep resistant magnesium–rare earth base alloys
Significance of stable and metastable phases in high temperature creep resistant magnesium–rare earth base alloys
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DOI：
10.1016/j.jallcom.2003.10.099
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发表时间：
2004-09
影响因子：
6.2
通讯作者：
B. Smola;I. Stulikova;J. Pelcová;B. Mordike
中科院分区：
文献类型：
--
作者：
B. Smola;I. Stulikova;J. Pelcová;B. Mordike
以最小蠕变速率为参照，讨论了多种镁稀土铸造合金的组织与蠕变性能的关系。片状析出物以致密的三角形排列在基体的棱柱面上，不仅为基位错的运动提供了最有效的障碍，而且对防止蠕变变形也非常有效。与α基体基面平行的抗剪小圆盘或板片是阻碍基位错运动的最小障碍，但却是阻碍基位错交叉滑移和非基位错滑移的主要障碍。还讨论了层错能降低对最小蠕变速率的影响。
The relationship between microstructure and creep properties is discussed for a number of Mg–rare earth cast alloys with reference to the minimum creep rate. Plate shaped precipitates, which form on the prismatic planes of the matrix in a dense triangular arrangement, provide not only most effective barriers to the motion of basal dislocations motion but are also very effective against creep deformation. Shear-resistant small discs or plates parallel to the basal planes of the α-matrix are the least effective barriers to the motion of basal dislocations but are strong obstacles to cross slip of basal dislocations and to non-basal slip. The influence of stacking fault energy decrease on the minimum creep rate is also mentioned.