Y对铸造Ni_3Al基合金组织和力学性能的影响

Effect of Y on the Microstructure and Mechanical Properties of Cast Ni 3Al Based Alloy

研究了Ｙ对定向和非定向铸造Ｎｉ３Ａｌ基合金Ｎｉ－９．０Ａｌ－８．０Ｃｒ－１．７Ｚｒ－０．０６Ｂ（ｗｔ％）不同温度下瞬时拉伸性能的影响。结果表明，Ｙ能提高定向凝固合金的韧性，降低合金的屈服强度；而对非定向凝固合金，Ｙ全面恶化合金的力学性能，即使０．０３％Ｙ的加入量，其危害性也是非常明显的。

The investigations have been carried out into the effect of Y on the instantaneous tensile strength of directionally and undirectionally solidified cast Ni 3Al based alloy Ni 9 0Al 8 0Cr 1 7Zr 0 06B wt.% from room temperature up to 750℃.The results showed that Y increased the ductility,but reduced the yield strength of the directionally solidified cast Ni 3Al based alloy,while Y is harmful to the strength and ductility of undirectionally solidified cast Ni 3Al based alloy,even adding small amounts up to 0 03%Y.