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机构地区:[1]北京航空航天大学,北京100191
出 处:《稀有金属材料与工程》2013年第2期400-404,共5页Rare Metal Materials and Engineering
基 金:国家自然科学基金(51071009);航空基金(2010ZF51071)
摘 要:采用粉末冶金法制备了Nb-16Si-22Ti-2Al-2Hf-2Cr合金,研究了粉末球磨时间(5、10、20h)及热压烧结温度(1500、1600℃)对合金组织和室温力学性能的影响。结果表明:热压烧结后的合金由Nb基固溶体NbSS、Ti基固溶体TiSS和硅化物Nb5Si3三相组成。随着球磨时间的延长,Nb5Si3和TiSS的含量增加,而NbSS的含量减少。室温硬度随球磨时间延长和热压烧结温度的升高而提高,20h/1600℃热压烧结合金硬度值最高,HV硬度达到11500MPa。1500和1600℃热压烧结下合金的断裂韧性随着粉末球磨时间的延长均呈下降的趋势,5h/1500℃热压烧结合金断裂韧性值最高,为10.14MPa·m1/2。Nb-16Si-22Ti-2Al-2Hf-2Cr bulk alloys have been prepared by powder metallurgy. The effects of milling time (5, 10, 20 h) of powder mixtures and hot-pressing temperatures (1500, 1600 °C) on the microstructure and room-temperature mechanical properties of the bulk alloys were investigated. It is revealed that the hot-pressed alloys are mainly composed of 3 phases including Nb solid solution (NbSS), Ti solid solution (TiSS) and Nb5Si3 silicides. With prolonging the milling time, the volume fractions of Nb5Si3 and TiSS phases increase, but that of NbSS phases decreases. The improvement in room-temperature hardness of bulk alloys is achieved with milling time and hot-pressing temperature increasing, and the bulk alloy milled for 20 h and hot-pressed at 1600 °C has the highest hardness of 11500 MPa. Moreover, the fracture toughness of the alloys hot-pressed at 1500 °C and 1600 °C both decreased with milling time prolonging. The bulk alloy milled for 5 h and hot-pressed at 1500 °C has the highest fracture toughness of 10.14 MPa·m^1/2.
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