Role of SPS temperature and holding time on the properties of Ti3AlC2-doped TiAl composites

M. Akhlaghi, E. Salahi, S. A. Tayebifard, G. Schmidt
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引用次数: 2

Abstract

In order to study the effects of sintering conditions on the properties of TiAl-based materials, two different compositions (TiAl-15 wt% Ti3AlC2 and TiAl-25 wt% Ti3AlC2) were chosen and manufactured by spark plasma sintering at 900 ºC/7 min and 1000 ºC/15 min. The results showed that increasing the MAX phase content had positive effect on the relative density and mechanical properties, but simultaneous increasing the temperature and holding time is more effective in improvement of properties. For TiAl-15 wt% Ti3AlC2 sample, the relative density, Vickers hardness, fracture toughness, and bending strength increased from 92.3%, 3.6 GPa, 10.9 MPa.m1/2, and 206 MPa to 95.2%, 4.5 GPa, 12.0 MPa.m1/2, and 336 MPa, respectively, as the sintering temperature and holding time increased from 900 ºC/7 min to 1000 ºC/15 min. In the case of TiAl-25 wt% Ti3AlC2 sample, increasing the sintering temperature and holding time from 900 ºC/7 min to 1000 ºC/15 min led to the improvement of relative density, Vickers hardness, fracture toughness, and bending strength from 92.8%, 4.1 GPa, 11.2 MPa.m1/2, and 270 MPa to 97.5%, 4.6 GPa, 11.8 MPa.m1/2, and 340 MPa, respectively.
SPS温度和保温时间对ti3alc2掺杂TiAl复合材料性能的影响
为了研究烧结条件对tial基材料性能的影响,选择了两种不同成分(TiAl-15 wt% Ti3AlC2和TiAl-25 wt% Ti3AlC2),分别在900℃/7 min和1000℃/15 min下进行了火花等离子烧结。结果表明,增加MAX相含量对相对密度和力学性能有积极影响,但同时提高温度和保温时间对性能的改善更为有效。对于ti -15 wt%的Ti3AlC2试样,相对密度、维氏硬度、断裂韧性和抗弯强度分别从92.3%、3.6 GPa、10.9 MPa提高。m1/2, 206 MPa至95.2%,4.5 GPa, 12.0 MPa。当烧结温度和保温时间从900ºC/7 min增加到1000ºC/15 min时,试样的相对密度、维氏硬度、断裂韧性和抗弯强度分别从92.8%、4.1 GPa、11.2 MPa提高到1000ºC/15 min。对于ti -25 wt%的Ti3AlC2试样,烧结温度和保温时间从900ºC/7 min增加到1000ºC/15 min,试样的抗折强度分别为m1/2和336 MPa。m1/2, 270 MPa至97.5%,4.6 GPa, 11.8 MPa。分别为m1/2和340mpa。
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