MORPHOLOGY OF MELT SPINNING SUPERSATURATED B2 NiAl

Abstract

Abstract: The morphology and structure of melt spinning Ni-33.6at% Al doped with B and RE were investigated.The results show that the alloy consists of L10 martensitic grains and L12 Ni3Al at the grain boundaries when it contains no B and RE.The addition of 0.11-0.31wt% B can suppress the martensitic transformation and Ni3Al separation at the boundaries,and a supersaturated B2 single phase NiAl is obtained.The addition of 0.05wt% RE can eliminate Ni3Al precipitated at the boundaries and get complete martensite,but 0.2-0.8wt% RE addition can suppress the martensitic transformation, and supersaturated B2 single phase NiAl is obtained.The formation mechanism of supersaturated B2 single phase NiAl has been analyzed.

Key words: NiAl, supersaturate, morphologl, melt spinning

SUN Baode;CHE Xiaozhou;LIN Dongliang;ZHOU Yaohe(Department of Materials Engineering,Shanghai Jiaotong University,Shanghai 20030,China)(Department of Materials Science,Shanghai Jiaotong University,Shanghai 200030,China). MORPHOLOGY OF MELT SPINNING SUPERSATURATED B2 NiAl[J]. Acta Metallurgica Sinica (English Letters), 1996, 9(2): 89-93.

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MORPHOLOGY OF MELT SPINNING SUPERSATURATED B2 NiAl

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