【摘 要】
：
A fine-grained TiAl alloy with a composition of Ti-45Al-5Nb-1.5Cr-0.2W (mole fraction,％) with multiphases was prepared by spark plasma sintering (SPS) and heat-t
【机 构】
：
State Key Laboratory of Powder Metallurgy,State Key Laboratory of Porous Metal Materials,National En
【基金项目】
：
supported by the National Key Basic Research Program of China;国家高技术研究发展计划(863计划)
论文部分内容阅读
A fine-grained TiAl alloy with a composition of Ti-45Al-5Nb-1.5Cr-0.2W (mole fraction,％) with multiphases was prepared by spark plasma sintering (SPS) and heat-treating at 1 100 ℃ for 48 h.The relationship among sintering temperature,microstructure and fracture toughness were investigated by X-ray diffractometry (XRD),optical microscopy (OM),scanning electron microscopy (SEM) and mechanical testing.The results show that microstructure of the bulk alloy depends on the sintering temperature strongly,and the main phase TiAl and few phases Ti3Al and niobium solid solution (Nbss) are observed in the SPS bulk samples.In the heat-treatment condition,the lamellar and Nbss phase can provide significant toughening by plastic strengthening,interface decohension,crack branch and crack bridge mechanisms.The fracture mode of the SPS TiAl composite samples is intergranular rupture and cleavage fracture.
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