Microstructure evolution and room temperature fracture toughness of as-cast and directionally solidified novel NiAl-Cr(Fe) alloy
作者： Lei Wang , Jun Shen , Yunpeng Zhang , Lanlan Guo , Hengxin Xu
DOI: 10.1016/J.INTERMET.2016.12.021
关键词: Eutectic system 、 Microstructure 、 Fracture mechanics 、 Metallurgy 、 Materials science 、 Directional solidification 、 Alloy 、 Fracture toughness 、 Nial 、 Vacuum induction melting
摘要: Abstract The microstructure evolution and room temperature fracture toughness of as-cast directionally solidified NiAl-Cr(Fe) alloy were investigated using OM, SEM, EDS, DSC three-point bending tests. From the result, NiAl-34Cr-4Fe (at.%) is a eutectic which consists cells in different sizes. half-baked mesh-like structure observed at cell center, radial emanating thicker or longer Cr(Fe) phases embedded within NiAl matrix are near boundary. In directional solidification process, solid-liquid interface morphology has an evolutionary process planar to cellular, even dendritic with increasing withdrawal rates, center refines gradually. transverse microstructure, characteristic similar that alloy. It can be seen from longitudinal colony/cell broken (short) rods 6 μm/s, they evolve granular when rate increases further. Moreover, regardless vacuum induction melting (as-cast) solidification, possesses poor due inferior brittleness both phases. Meanwhile, crack propagation surface better understand behavior.
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