Mg，RE复合微合金化提高Ni_3Al（B）－Cr基合金的室温塑性

AN IMPROVEMENT OF ROOM TEMPERATURE DUCTILITY OF Ni_3Al(B)-Cr BASE ALLOYS BY MULTI-ALLOYING OF Mg AND RE

研究了由γ＋γ＇相组成的Ｎｉ３Ａｌ（Ｂ）－Ｃｒ基合金在Ｍｇ，ＲＥ复合微合金化后的室温拉伸性能。发现Ｍｇ，ＲＥ的微合金化并不降低合金的屈服强度，但明显细化其γ＇相，其形态也由粗大的块状转变为均匀的球状。合金的延伸率提高了约２０％。

The tensile properties of two-phase (γ+γ') Ni_3Al(B)-Cr base alloys containing Zr, Mg and RE have been studied. Experiments show that Ni_3Al(B)-Cr-Mg-RE alloy as compared with Ni_3Al(B)-Cr-Zr alloy, the yield strength does not decrease, the mopohology is changed from bulky irregular γ'- phases to fine spherical γ'- phases and the percentage of elongation is increased about 20%.