摘要
High-density titanium alloys with different grains were prepared by spark plasma sintering(SPS) at 900 ℃ and 15 MPa using spherical powder generated by the plasma rotating electrode process(PREP) and nonspherical powders generated by hydrogenation-dehydrogenation(HDH) and molten salt electrolysis(MSE) as raw materials. Studies have shown that the PREP sample is a dense lamellar α structure and that the sample is clean. The microstructure of the HDH sample is composed of equiaxed α and lamellar α structures, and there are many flaws on the surface of the sample. The MSE samples are composed of α lamellar and coarse equiaxed crystals. The integral grain size is bulky, there are many irregular pores in the samples, and the samples are not clean. Of the three samples, the HDH sample has the largest compressive strength(526.85 MPa) and hardness(HV 293.1) but poor plasticity(compression strain is 26.61%);the compressive strengths of the PREP and MSE samples are 268.47 and 251.23 MPa, the compressive strains are 45.08% and 17.44%, and the microhardness values are HV138.6 and HV203.4, respectively.
以旋转电极(PREP)球形粉末和氢化脱氢(HDH)及熔盐电解(MSE)非球形粉末为原料,采用放电等离子烧结技术在900℃和15 MPa下制备不同晶粒高致密钛合金。研究表明,PREP样品为致密的片层α组织,样品干洁度较高;HDH样品显微组织由等轴α和片层α组织组成,样品表面有较多的裂纹存在;MES样品由α片层和粗大等轴晶组成,晶粒整体较为粗大,样品中存在较多不规则孔隙,干洁度较差。HDH样品压缩强度最大(526.85MPa),硬度最高(HV293.1),但塑性较差(压缩应变为26.61%);PREP及MSE样品压缩强度分别为268.47MPa和251.23MPa,压缩应变分别为45.08%和17.44%,显微硬度分别为HV 138.6、HV 203.4。
作者
YANG Xin
SHI Ming-jun
LIU Shi-feng
LI An
杨鑫;时明军;刘世锋;李安(College of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China;School of Metallurgical and Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China)
基金
Projects(51671152,51304153,51504191,51874225)supported by the National Natural Science Foundation of China
Project(14JK512)supported by Natural Science Foundation of Shaanxi Educational Committee,China
Project(18JC019)supported by Shaanxi Provincial Department of Education Industrialization Project,China
Project(14JK1512)supported by Shaanxi Provincial Department of Education Natural Science Special Project,China
