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首页> 外文期刊>Materials Science and Engineering >Investigations on the solidification microstructures and room temperature compression properties of Nb-doped NiAl-32Cr-6Mo hypereutectic alloy
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Investigations on the solidification microstructures and room temperature compression properties of Nb-doped NiAl-32Cr-6Mo hypereutectic alloy

机译：掺Nb的NiAl-32Cr-6Mo过共晶合金的凝固组织和室温压缩性能研究

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摘要

Solidification microstructures and compression properties of NiAl-32Cr-6Mo hypereutectic alloys containing different contents of Nb were investigated. The addition of Nb did not change the basic phase constituents, though a new phase of Laves Nb(Cr1-x-yNixAly)2was observed. However, the primary Cr(Mo) phase no longer showed obvious dendritic morphology, the formation of lamellae was disturbed and the eutectic cellular microstructure degenerated. When the Nb content was 5%, eutectic lamellae coarsened and became spherical and poorly aligned. Fully eutectic microstructures were obtained in the directionally solidified hypereutectic alloys grown at 6 µm/s regardless of the addition amount of Nb. With the increasing content of Nb addition, the volume fraction of Laves phase located at the NiAl/Cr(Mo) boundary became more. The yield strength of directionally solidified NiAl-32Cr-6Mo-3Nb alloy reached to 2072 MPa, which is the highest value in the NiAl-based eutectic alloy at present. Well-aligned microstructure and more strengthening phase are conducive to the improvement of properties. All the alloys exhibited brittle quasi-cleavage fracture mode, cleavage in the NiAl phase and debonding of the NiAl/Cr(Mo) interface accompanied by Cr(Mo) lamellae and Cr2Nb phase pulled out were observed in the fracture surface.
机译：研究了不同Nb含量的NiAl-32Cr-6Mo过共晶合金的凝固组织和压缩性能。尽管观察到了新的Laves Nb（Cr1-x-yNixAly）2相，但Nb的添加并未改变基本相的组成。然而，主要的Cr（Mo）相不再显示出明显的树突形态，薄片的形成受到干扰，共晶细胞的微观结构退化。当Nb含量为5％时，共晶薄片变粗并变成球形并且排列不良。不论Nb的添加量如何，在以6μm/ s的速度生长的定向凝固过共晶合金中均获得了完全的共晶组织。随着Nb添加量的增加，位于NiAl / Cr（Mo）边界的Laves相的体积分数增加。定向凝固NiAl-32Cr-6Mo-3Nb合金的屈服强度达到2072 MPa，是目前NiAl基低共熔合金中的最高值。良好的微观结构和更强的强化相有助于改善性能。所有合金均表现出脆性准断裂断裂模式，在断裂表面观察到NiAl相的断裂和NiAl / Cr（Mo）界面的脱键并伴有Cr（Mo）薄片和Cr2Nb相的拉出。

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