粉末冶金法制备Ti-Nb-Zr-Sn合金研究
Preparation of Ti-Nb-Zr-Sn alloy by powder metallurgy
蔡春波1，郭世柏1，康启平2，张勇强1，肖勇1
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作者单位：（1.湖南科技大学机电工程学院，湖南 湘潭 411201;
2.北京科技大学材料科学与工程学院，北京 100083）
中文关键字：Ti-24Nb-4Zr-7.9Sn合金；烧结；力学性能；组织
英文关键字：Ti-24Nb-4Zr-7.9Sn alloy；sintering；mechanical property；microstructure
中文摘要： 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方法研究烧结工艺对Ti-24Nb-4Zr-7.9Sn合金组织和性能的影响。实验结果表明，最佳烧结工艺为，烧结温度1250 ℃，保温2 h；合金致密度高达97.2%，烧结密度5.2 g/cm3，拉伸强度705Mpa，延长率5.58%。该合金具有典型的魏氏体组织，由β基体和析出的α相组成。烧结温度越高，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相平均尺寸都相应增加。
英文摘要： Ti-24Nb-4Zr-7.9Sn alloy was prepared by powder metallurgy using titanium hydride powder, niobium powder, zirconium powder and stannum powder as raw materials. The effect of sintering process on microstructure and mechanical property was investigated by mechanical property and SEM. The result show the best process is sintering at 1250 ℃ for 2 h. the relative density, tensile strength and elongation of the alloy reaches 97.2%, 5.2g/cm3, 705 Mpa and 5.58%,respectively. The microstructure is a typical Widmannstatten microstructure, which possessed β-matrix and α-precipitation. with the increase of sintering temperature and the higher the porosity decreases, the average size of β-matrix, α-precipitation particles have a corresponding increases, the size of β-matrix and α-precipitation increased with the increasing of sintering time.