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以直流电弧作为加热源,在高纯氩气氛下蒸发了Ni-Al母合金,制备出粒度小于60 nm的合金纳米粉末,并研究了纳米粉末中的相生成规律。结果表明:纳米粉末中合金相的形成规律与Ni-Al相图一致;蒸发高Ni含量的母合金容易得到以金属间化合物相-εAlNi3和-δAlNi为主的纳米粉末;而蒸发Al含量较高的母合金时,容易得到-γAl3Ni2相,且粉末中化合物相的相对含量显著减少;改变放电电流的大小可以改变粉末中析出相的种类和相对含量;而只改变惰性气体的压力时,粉末中的析出相种类不变,只是相对含量改变。实验发现所制备的纳米粉末中未出现-βAl3Ni5和Al3Ni低温相。
The DC arc was used as the heat source to evaporate the Ni-Al master alloy in the high-purity argon atmosphere to prepare the alloy nano-powder with the particle size less than 60 nm and study the phase-forming rules in the nano-powder. The results show that the formation regularity of the alloy phase in the nano-powder is consistent with that of the Ni-Al phase. The nano-powder mainly containing intermetallic compounds -εAlNi3 and -δAlNi can be easily obtained from the mother alloy with high Ni content. , The -γAl3Ni2 phase is easily obtained, and the relative content of the compound phase in the powder is remarkably reduced. Changing the size of the discharge current can change the kind and relative content of the precipitated phase in the powder. When only the pressure of the inert gas is changed, Precipitation of the same species, but the relative content change. It was found experimentally that the -βAl3Ni5 and Al3Ni phases do not appear in the prepared nanopowders.