大量压缩和拉伸实验表明:在无硼Ni_3Al合金中加入适量的Zr可使其具有较好的室温塑性,Zr对Ni_3Al合金的韧化作用并不局限于富Ni的Ni_3Al合金,对Al含量略高于化学计量成分的Ni_3Al也有一定的韧化作用,而且Zr在晶界仅略有偏聚,因此,可以认为Zr对Ni_3Al合金的韧化机理与硼不同,Zr对改善中温脆性和提高高温塑性也都具有一定的效果
Many compression and tension tests showed that the room temperatureductility of boron-free microalloying Ni_3Al may markedly improved by a moderate additionof Zr. An additive of Zr in the stiochiometric Ni_3Al, even slightly enriched Al, may be tough-ened and improved fairly on brittleness at 400--600℃. This behaves much better if Zr addedtogether with B. However, the high temperature ductility of Ni_3Al alloy containing Cr may besignificantly increased by Zr, which is slightly segregated along grain boundary. Thus, thetoughening mechanism by Zr seems to be different from that by B.
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