原位生成TiCx增强Ni合金复合材料的制备及力学性能研究

Preparation and Mechanical properties of in-situ TiCx/Ni composite materials

摘要:

以Ti₃AlC₂和Ni合金粉为原料,采用原位热压烧结法制备了TiC_x/Ni合金复合材料。高温下Ni合金引起Ti₃AlC₂分解形成TiC_x,Al原子和少部分Ti原子从基体中脱离,并与Ni合金发生反应。添加20Vol%Ti₃AlC₂和40Vol%Ti₃AlC₂时,TiC_x中x的值分别为0.625和0.715。利用XRD、SEM和 EDS等表征方法对复合材料进行物相分析以及微观结构分析。研究表明,原位生成的TiC_x与Ni合金基体结合牢固,所制备的复合材料具有优异的力学性能,添加20%Ti₃AlC₂和40%Ti₃AlC₂时,复合材料的压缩强度分别达到了2.2 GPa和2.09 GPa,相应的压缩断裂应变分别为9.6%和8.5%。

Abstract:

TiC_x/Ni composite materials was prepared using Ti₃AlC₂ and Ni alloy powders as raw materials by in-situ hot-pressing sintering. Ni alloy, under the high temperature, triggers Ti₃AlC₂ dissociation, Al atoms and a small number of Ti atoms seperate from the matrix of Ti₃AlC₂ and react with Ni alloy. TiC_x in the value of x equal to 0.625 and 0.715 was formed as adding 20Vol%Ti₃AlC₂ and 40Vol% Ti₃AlC₂, respectively.XRD, SEM and EDS were used to analysize the phase composition and microstructure of composite.The interface between in situ generated TiC_x and Ni alloy combined strongly, therefore the composite materials perform excellent mechanical properties. After adding 20Vol% and 40Vol%Ti₃AlC₂, the compression strength of composite material reached to 2.09 GPa and 2.2 GPa, and corresponding compression fracture strain was 9.6% and 8.5%, respectively.#$NLKeywords: In-situ TiC_x; hot-pressing sintering; mechanical properties; microstructure