Microstructures and mechanical properties of TiB2 particle reinforced TiAl composites by plasma arc melting process
Microstructures and mechanical properties of TiB2 particle reinforced TiAl composites by plasma arc melting process
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DOI：
10.1016/s0921-5093(97)00559-5
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发表时间：
1997-12
期刊：
影响因子：
6.4
通讯作者：
A. Hirose;M. Hasegawa;K. Kobayashi
中科院分区：
文献类型：
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作者：
A. Hirose;M. Hasegawa;K. Kobayashi
采用等离子弧熔炼工艺，通过改变TiB 2的体积分数和初始TiB 2粉末的粒度，制备了TiB 2颗粒增强Ti-34 mass%Al复合材料。研究了TiB 2含量及分布对复合材料性能的影响。所述复合物含有5体积%的当TiB 2粉末粒度为45-53 μm时，TiB 2的抗拉强度最高，为550 MPa，比未增强的Ti-34 mass% Al提高了约140 MPa，当TiB 2粉末含量大于5 vol. %时，复合材料的抗拉强度下降TiB_2和TiB_2在使用粗TiB_2粉末制备的复合材料中，粒度为90-150 μm。这被认为是由于较高的人口接触TiB 2颗粒，作为裂纹萌生和扩展的网站，在这些复合材料。复合材料中TiB 2的体积分数为5 ~ 7vol. %，在1173 K和1273 K下，Ti-34 Al的屈服强度分别高出45-65 MPa和55-70 MPa，在这些温度下的塑性伸长率也比未增强的Ti-34 Al高出9-12%。
Using the plasma arc melting process, TiB2particle reinforced Ti–34 mass%Al composites were produced with varying volume fraction of TiB2and size of starting TiB2powders. The effects of the TiB2fractions and distributions on the properties of the composites were investigated. The composite containing 5 vol.% TiB2with fine powder of TiB2, 45–53 μm in size, had the best tensile strength of 550 MPa, which was ∼140 MPa greater than that of the unreinforced Ti–34 mass%Al. The degradation of the tensile strengths occurred in the composites containing more than 5 vol.% TiB2and in the composites produced using coarse TiB2powder, 90–150 μm in size. This is believed to be attributed to higher population of touching TiB2particles, which act as crack initiation and propagation sites, in these composites. The composites containing the volume fractions of TiB2ranging from 5 to 7 vol.% exhibited greater proof strengths by 45–65 MPa at 1173 K and 55–70 MPa at 1273 K, and also had greater plastic elongations of 9–12% at these temperatures than the unreinforced Ti–34 mass%Al.