烧结温度对SPS制备Ti-24Nb-4Zr-8Sn合金组织和力学性能的影响

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Ti-24Nb-4Zr-8Sn Alloy Prepared by SPS

摘要:

利用放电等离子烧结技术(SPS)制备了Ti-24Nb-4Zr-8Sn合金，研究了烧结温度对合金相对密度、显微组织及力学性能的影响。结果表明：在1000~1200 ℃烧结温度范围内合金具有较高的相对密度和抗压强度，合金主要由β-Ti相和Ti-Nb固溶体组成的混合基体及少量α-Ti相组成；随着烧结温度的升高，合金相对密度和抗压强度呈增大趋势，合金中α-Ti相向β-Ti相逐渐转变，同时合金中Ti-Nb固溶体含量越来越少，且尺寸减小；合金压缩弹性模量在58~61 GPa之间，受烧结温度变化影响较小

Abstract:

Ti-24Nb-4Zr-8Sn alloys (wt%) were prepared by spark plasma sintering (SPS). The effects of different sintering temperatures on the relative density, microstructure and mechanical properties of the alloys were investigated. The results show that in the sintering temperature range from 1000 oC to 1200 oC, the alloys present a high relative density and compressive strength levels. The alloys mainly contain the mixed matrix consisting of β-Ti phase and the Ti-Nb solid solution, and some α-Ti phase. With the sintering temperatures increasing from 1000 oC to 1200 oC, the alloys exhibit a increasing trend for the relative density and the compressive strength. In the meantime, the transformation from α-Ti to β-Ti phase appears, and the size and amount of the Ti-Nb solid solution decrease. The compressive elastic modulus of the alloys is in the range of 58~61 GPa, and it is little affected by the sintering temperatures