变形高温合金中加入适量Mg除能延长蠕变第二阶段,特别是第三阶段的时间外,还能降低低应变速率区的稳态蠕变速率,但在较高的应变速率时,影响不太明显。这种作用是晶内分布的Mg引起的。
By adding small amount of Mg to the wrought superalloys, their steadystage of creep, and especially the tertiary stage of creep are prolonged, and thesteady creep rate is decreased in the cases of low strain rates. At higher strain ra-tes, however, the effect of Mg on creep rate has been found to be vanish. Thesemay be attributed to the Mg dissolution in the matrix. A mechanism of the effectof Mg addition on creep behavior is proposed.
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