富Ni的NiAl退火组织和室温力学性能

ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF ANNEALED NiAl WITH Ni-RICH

快速凝固Ｎｉ－３４．６ａ％Ａｌ薄带经１５２３Ｋ退火２ｈ并以较快速度冷却后形成以ＮｉＡｌ马氏体为基体、γ’－Ｎｉ３Ａｌ沿晶界网状分布和少量残余β－ＮｉＡｌ的组织通火后，室温弯曲延性（７．

A microstructure consisted of a NiAl martensite as a matrix, γ'-Ni3Al distributed along the grain boundaries of the matrix and with a network appearance, and a few retained β-NiAl was resulted from annealing at 1523K for 2h in a rapidly solidified Ni-34.6a.%Al ribbon. The annealed alloy has a good bend ductility (7.6% ). It is probably related to the ductile Ni3Al with a high density of dislocations and emission and transmission of the dislocations near γ'/β interfaces into β.