本文研究了Ni_3Al合金中的 YNi_5相及该相对合金组织与性能的影响.结果表明:Ni_3Al合金中加入Y以后,可产生 YNi_5相,并且随Y含量的增加YNi_5相的数量不断增加,在Y含量≤0.1wt-％时,Y主要以固溶形式存在,而在Y含量≥0.3wt-％时主要以YNi_5相的形式存在.YNi_5相的出现可明显细化合金晶粒,使平直晶界变成弯曲状.少量的Y(≤0.1wt-％)对合金的高温压缩性能和抗氧化性能有好处,而当Y含量较高≥0.3wt-％时,由于有大量的条状,无规则状YNi_5相在晶内和晶界析出,对Ni_3Al基合金的高温强度、塑性及抗氧化性产生有害的影响。
An additive of Y to Ni_3Al based alloy may form a phase YNi_5 which increases in amount with the increase of Y content. It was found that the YNi_5 phase in Ni_5Al alloy could remarkably make its grains finer and its grain boundaries more crooked other than straigh. If the Y content≤0.1 wt-％, it occurs as solid solution state and is favourable to high temperature compressive properties and oxidation resistance of the alloy. While Y≥0.3 wt-％, the formation of YNi_5 is predominant in the shape of irregular strips inside Ni_3Al grains and along their grain boundaries. This seems to be quite harmful to high temperature strength, ductility and oxidation resistance of the alloy.
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