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以氢化钛粉和Nb、Zr、Sn粉为原料,采用粉末冶金法制备致密的Ti-24Nb-4Zr-7.9Sn合金。通过力学性能测试和SEM法研究了烧结工艺对Ti-24Nb-4Zr-7.9Sn合金组织和性能的影响。结果表明,最佳烧结工艺为烧结温度1250℃×2h,此时合金致密度高达97.2%、烧结密度5.2g/cm3、抗拉强度705MPa、伸长率5.58%。该合金的组织为典型的魏氏体,由β基体和析出的α相组成;烧结温度高,孔隙度明显降低,β晶粒、α相平均尺寸都相应增加;保温时间越长,β晶粒、α相平均尺寸也都相应增加。
A compact Ti-24Nb-4Zr-7.9Sn alloy was prepared by powder metallurgy from titanium hydride powder and Nb, Zr and Sn powders. The effect of sintering process on microstructure and properties of Ti-24Nb-4Zr-7.9Sn alloy was studied by mechanical properties test and SEM. The results show that the optimum sintering temperature is 1250 ℃ × 2h, the density of the alloy reaches as high as 97.2%, the sintering density of 5.2g / cm3, the tensile strength of 705MPa and the elongation of 5.58%. The microstructure of the alloy is typical Wenstein, which is composed of β matrix and precipitated α phase. The sintering temperature is high, the porosity is obviously decreased, the average size of β grains and α phase are correspondingly increased. The longer the holding time, , The average size of a phase also increased accordingly.