Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7990090 | Journal of Alloys and Compounds | 2018 | 8 Pages |
Abstract
The paper presents the fabrication of (0.6-3.0â¯wt%) Y2O3-Ti6Al4V composites by spark plasma sintering (SPS) with the sintering heating rate of 100â¯Â°C/min and the sintering temperature of 900â¯Â°C. Ti6Al4V powders and Y2O3 powders were admixed by rocking mill for 8â¯hâ¯at 30â¯Hz. Scanning electron microscopy (SEM) equipped with complete energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) were used to characterize the as-received Ti6Al4V powders, Y2O3 powders, the admixed composite powders and the sintered samples. The microhardness, the compressive yield strength and the ultimate strength of as-sintered samples at room temperature were enhanced up to 464.1HV, 1346â¯MPa and 1583â¯MPa respectively with a plastic strain of 19.1%, when 2.0â¯wt% Y2O3 was introduced. The mechanical behaviors of 2.0â¯wt% Y2O3-Ti6Al4V composite at 450â¯Â°C were also carried out with the yield strength of 832â¯MPa and the ultimate strength of 1088â¯MPa. Compared with the sintered Ti6Al4V, the 2.0â¯wt% Y2O3-Ti6Al4V composite has higher yield strength and ultimate strength at elevated temperature with the increment of 54% and 37%, respectively. The mode of fracture was transformed from ductile fracture to a combination of ductile and brittle fractures with the increase of Y2O3 content.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Ang Li, Shuan Ma, Yanjie Yang, Shiqi Zhou, Lan Shi, Mabao Liu,