The Effect of Zirconium and Yttrium Oxide on the Microstructure and Mechanical Properties of Ti-Si-Zr Based Composites

Vitus Mwinteribo Tabie, Xiao-jing Xu, Liangliang Wei, Xiangzhong Shi
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引用次数: 1

Abstract

Ti-4Si-xZr-yY2O3/5TiO2 matrix composites, containing various weight percentages (0 and 1.3) of zirconium and (0 and 0.3) yttrium oxide, were synthesized via ball milling and powder metallurgical route. Mechanical alloying of the powders was confirmed after ball milling using x-ray diffraction (XRD) and scanning electron microscope (SEM). The ball-milled powders were cold compacted at a pressure of 550 MPa. Sintering was done first at 600 °C for 2h, followed by 800 °C for 2h, then 1000 °C for 2h and finally at 1250 °C for 3h, all in a controlled vacuum environment. The effect of the addition in weight percentages of Zr and Y2O3 on the microstructure, porosity, hardness, elastic modulus, and fracture toughness of the sintered composites, were studied. The results show improvements in the microhardness by 2.2 times, elastic modulus by 34.3%, porosity by 50 %, and fracture toughness by 57%, when Zr and Y2O3 content was 1.3 wt% and 0.3 wt%, respectively. The improvements in the microstructure and mechanical properties can be attributed to the formation of more stable; Ti5Si3 and Ti5Si4 phases and the solid solutions of Ti2Zr, Zr3Si2, and Ti2Zr3Si3 compounds.
氧化锆和氧化钇对Ti-Si-Zr基复合材料组织和力学性能的影响
采用球磨法和粉末冶金法合成了含有不同重量百分比锆(0和1.3)和氧化钇(0和0.3)的Ti-4Si-xZr-yY2O3/5TiO2基复合材料。采用x射线衍射(XRD)和扫描电镜(SEM)对球磨后粉末的机械合金化进行了验证。在550 MPa的压力下对球磨粉末进行冷压。首先在600°C下烧结2h,然后在800°C下烧结2h,然后在1000°C下烧结2h,最后在1250°C下烧结3h,所有这些都在受控的真空环境中进行。研究了Zr和Y2O3质量分数对烧结复合材料显微组织、孔隙率、硬度、弹性模量和断裂韧性的影响。结果表明,当Zr和Y2O3含量分别为1.3 wt%和0.3 wt%时,合金的显微硬度提高2.2倍,弹性模量提高34.3%,孔隙率提高50%,断裂韧性提高57%。显微组织和力学性能的改善可归因于形成更加稳定;Ti5Si3和Ti5Si4相以及Ti2Zr、Zr3Si2和Ti2Zr3Si3化合物的固溶体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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