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首页> 外文期刊>Materials >Room-Temperature and High-Temperature Tensile Mechanical Properties of TA15 Titanium Alloy and TiB Whisker-Reinforced TA15 Matrix Composites Fabricated by Vacuum Hot-Pressing Sintering
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Room-Temperature and High-Temperature Tensile Mechanical Properties of TA15 Titanium Alloy and TiB Whisker-Reinforced TA15 Matrix Composites Fabricated by Vacuum Hot-Pressing Sintering

机译：真空热压烧结制备TA15钛合金和TiB晶须增强TA15基复合材料的室温和高温拉伸力学性能

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In this paper, the microstructure, the room-temperature and high-temperature tensile mechanical properties of monolithic TA15 alloy and TiB whisker-reinforced TA15 titanium matrix composites (TiBw/TA15) fabricated by vacuum hot-pressing sintering were investigated. The microstructure results showed that there were no obvious differences in the microstructure between monolithic TA15 alloy and TiBw/TA15 composites, except whether or not the grain boundaries contained TiBw. After sintering, the matrix microstructure presented a typical Widmanst?tten structure and the size of primary β grain was consistent with the size of spherical TA15 titanium metallic powders. This result demonstrated that TiBw was not the only factor limiting grain coarsening of the primary β grain. Moreover, the grain coarsening of α colonies was obvious, and high-angle grain boundaries (HAGBs) were distributed within the primary β grain. In addition, TiBw played an important role in the microstructure evolution. In the composites, TiBw were randomly distributed in the matrix and surrounded by a large number of low-angle grain boundaries (LAGBs). Globularization of α phase occurred prior, near the TiBw region, because TiBw provided the nucleation site for the equiaxed α phase. The room-temperature and high-temperature tensile results showed that TiBw distributed at the primary β grain boundaries can strengthen the grain boundary, but reduce the connectivity of the matrix. Therefore, compared to the monolithic TA15 alloy fabricated by the same process, the tensile strength of the composites increased, and the tensile elongation decreased. Moreover, with the addition of TiBw, the fracture mechanism was changed to a mixture of brittle fracture and ductile failure (composites) from ductile failure (monolithic TA15 alloy). The fracture surfaces of TiBw/TA15 composites were the grain boundaries of the primary β grain where the majority of TiB whiskers distributed, i.e., the surfaces of the spherical TA15 titanium metallic powders.
机译：本文研究了通过真空热压烧结制备的整体式TA15合金和TiB晶须增强TA15钛基复合材料（TiBw / TA15）的组织，室温和高温拉伸力学性能。显微组织结果表明，整体式TA15合金与TiBw / TA15复合材料之间的显微组织没有明显差异，除了晶界是否含有TiBw。烧结后，基体的微观结构呈现出典型的Widmansttten结构，初级β晶粒的尺寸与球形TA15钛金属粉末的尺寸一致。该结果表明，TiBw不是限制初级β晶粒的晶粒粗化的唯一因素。此外，α菌落的晶粒粗化是明显的，并且在初生β晶粒内分布有高角度晶界（HAGBs）。此外，TiBw在微观结构演变中起着重要作用。在复合材料中，TiBw随机分布在基体中，并被大量低角度晶界（LAGB）包围。由于TiBw为等轴α相提供了成核位置，因此在TiBw区域附近先发生了α相的球化作用。室温和高温拉伸结果表明，分布在主要β晶界的TiBw可以强化晶界，但降低基体的连通性。因此，与通过相同方法制造的整体式TA15合金相比，复合材料的拉伸强度增加，而拉伸伸长率降低。此外，通过添加TiBw，断裂机理从韧性断裂（整体TA15合金）变为脆性断裂和韧性断裂（复合）的混合物。 TiBw / TA15复合材料的断裂表面是主要的β晶粒的晶界，其中大部分TiB晶须分布，即球形TA15钛金属粉末的表面。

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