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首页> 外文期刊>Materials Science and Engineering >Microstructure, fracture toughness and compressive property of as-cast and directionally solidified NiAl-based eutectic composite
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Microstructure, fracture toughness and compressive property of as-cast and directionally solidified NiAl-based eutectic composite

机译：铸态和定向凝固NiAl基共晶复合材料的组织，断裂韧性和压缩性能

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摘要

Microstructure and room temperature mechanical property of as-cast and directionally solidified NiAl-Cr (Mo) eutectic composite were investigated by SEM, EDS, three point bending test and compression test. The microstructure of as-cast alloy consists of Cr(Mo) primary dendrites and equiaxed eutectic cells. For the directional solidification of liquid metal cooling technique (LMC), only the small quantity of Cr(Mo) primary dendrites appear in the beginning of solidification, and the fully and well-aligned lamellar structure parallel to the growth direction is obtained in the steady-state zone. However, the Cr(Mo) primary phase is always observed in the whole directional solidification of zone melted liquid metal cooling technique (ZMLMC), and the eutectic lamellas are disordered and not parallel to the growth direction in the steady-state zone. Compared to the ZMLMC alloys, the LMC alloy has the better room temperature fracture toughness and compressive property due to the well-aligned lamellar structure. Crack propagation and fracture surface are also observed to understand the fracture behavior.
机译：通过SEM，EDS，三点弯曲试验和压缩试验研究了铸态定向凝固NiAl-Cr（Mo）共晶复合材料的组织和室温力学性能。铸态合金的微观结构由Cr（Mo）初生枝晶和等轴共晶细胞组成。对于液态金属冷却技术（LMC）的定向凝固，在凝固开始时仅出现少量的Cr（Mo）初生枝晶，并在稳定状态下获得了与生长方向平行的完全且良好排列的层状结构状态区域。然而，在区域熔融液态金属冷却技术（ZMLMC）的整个定向凝固过程中始终观察到Cr（Mo）初生相，共晶薄层无序且不平行于稳态区的生长方向。与ZMLMC合金相比，LMC合金具有良好排列的层状结构，因此具有更好的室温断裂韧性和压缩性能。还观察到裂纹扩展和断裂表面，以了解断裂行为。

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