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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Superheat on Microstructure and Mechanical Properties of Ductile Cu47.5Zr47.5Al5 Bulk Metallic Glass-Matrix Composite
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Influence of Superheat on Microstructure and Mechanical Properties of Ductile Cu47.5Zr47.5Al5 Bulk Metallic Glass-Matrix Composite

机译：过热度对延性Cu 47.5 Zr 47.5 Al 5 块状金属玻璃基复合材料的组织和力学性能的影响

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摘要

Generally bulk metallic glasses (BMGs) posses very less ductility and toughness at room temperature. Over the recent past years to improve up on these properties in many alloy system BMG composites have been developed. It was also reported that Cu47.5Zr47.5Al5 BMG composite shows a very high strength together with an extensive work hardening-like behavior of large ductility around 18%. In this study, the influence of superheat on microstructure and the resulting mechanical properties in Cu47.5Zr47.5Al5 bulk metallic glass-matrix composite alloy has been studied. The Cu47.5Zr47.5Al5 melt solidifies into a composite microstructure consisting of crystalline precipitates embedded in an amorphous matrix. The crystalline phase consists of B2 CuZr (cubic primitive with CsCl structure) with a small amount of monoclinic CuZr martensitic structure embedded in an amorphous matrix. The volume fraction of crystalline phases varies with melting current as well as position along the length of the as-cast rod, depending on the local cooling condition. The volume fraction and the distribution of the crystalline precipitates are heterogeneous in the amorphous matrix. Room temperature uniaxial compression tests revealed high yield strength ranging from 796 to 1900 MPa depending upon the volume fraction of the crystalline phases present. The presence of the dendritic B2 CuZr significantly improved the ductility. The BMG composites show a pronounced plastic strain up to 14% for the higher volume fraction of crystalline phase.
机译：通常，大块金属玻璃（BMG）在室温下具有极低的延展性和韧性。近年来，为了改善许多合金体系中的这些性能，已经开发了BMG复合材料。还据报道，Cu 47.5 Zr 47.5 Al 5 BMG复合材料显示出很高的强度，并且具有大的类似工作硬化的行为。延展性约为18％。本研究研究了过热度对Cu 47.5 Zr 47.5 Al 5 块状金属玻璃基复合合金的微观结构及其力学性能的影响。已经研究过。 Cu 47.5 Zr 47.5 Al 5 熔体凝固成复合微结构，该复合微结构由嵌入非晶态基质中的晶体沉淀物组成。结晶相由B2 CuZr（具有CsCl结构的立方本征）组成，少量的单斜晶CuZr马氏体结构嵌入非晶基体中。结晶相的体积分数随熔化电流以及铸态棒长度方向的位置而变化，这取决于局部冷却条件。晶体沉淀物的体积分数和分布在非晶基质中是不均匀的。室温单轴压缩试验表明，高屈服强度范围为796至1900 MPa，具体取决于存在的结晶相的体积分数。树状B2 CuZr的存在显着改善了延展性。对于较高体积分数的结晶相，BMG复合材料表现出高达14％的明显塑性应变。

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