Microstructure and mechanical behavior of in situ Ni–Ni3Si composite
Microstructure and mechanical behavior of in situ Ni–Ni3Si composite
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DOI：
10.1016/j.jallcom.2006.06.019
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发表时间：
2007-04
影响因子：
6.2
通讯作者：
A. T. Dutra;P. L. Ferrandini;R. Caram
中科院分区：
文献类型：
--
作者：
A. T. Dutra;P. L. Ferrandini;R. Caram
复合材料允许人们将脆弱相和延性相联系起来，以获得良好的性能组合。通过共晶转变获得的原位复合材料可以在平衡条件下呈现相组合。对共晶Ni-Ni3Si合金样品进行电弧熔化，并在铸态和定向凝固（DS）条件下进行表征。铸态组织细化均匀，铸态组织沿抽热方向排列，呈现平面固液界面。该合金在室温下表现出较高的强度和拉伸塑性（总应变3.7%，UTS=810MPa），弹性模量E=264MPa。高温试验表明，随着温度的升高，屈服强度几乎呈线性下降。未发现脆性到韧性的转变温度。
Composite materials allow one to associate fragile and ductile phases in order to obtain a good combination of properties. In situ composites obtained through eutectic transformation may present a combination of phases under a condition of equilibrium. Samples of the eutectic Ni–Ni3Si alloy were arc-melted and characterized in the as cast and directionally solidified (DS) conditions. The as cast microstructure was refined and uniform, while the DS microstructure was aligned in the direction of heat extraction and presented a plane solid/liquid interface. The alloy displayed an interesting combination of relatively high strength and tensile ductility at room temperature (3.7% total strain; UTS=810MPa), and a modulus of elasticity E=264MPa. High temperature tests showed that the yield strength decreased almost linearly as the temperature rose. No brittle to ductile transition temperature was found.