Si含量对Ti-Al-Si合金显微组织和性能的影响
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摘要
采用粉末冶金法在多段位真空烧结炉中制备了Ti-20Al-xSi(x=0%、1%、2%、3%、4%、5%)合金。利用光学显微镜(OM)、X射线衍射(XRD)表征分析了合金的组织和物相,并测试了合金的密度和布氏硬度。结果表明,烧结温度为1 400℃时,Ti-20Al-xSi合金组织均匀、细小; Si的添加使合金组织细化、分布更均匀;合金中除Ti_3Al相外,还有Ti_5Si_3和Ti_5Si_4相;当Si的含量为3%,致密度和硬度比未添加时分别提高了19. 89%和47%。
Ti-20 Al-xSi alloys( x = 0%,1%,2%,3%,4%,5%) were prepared in multi grade vacuum sintering furnace by powder metallurgic method. The microstructure and phase of the alloy were characterized by optical microscope( OM) and X-ray diffraction( XRD),and the density and Brinell hardness of the alloy were tested. The results show that the microstructure of Ti-20 Al-xSi alloy is uniform and fine when the sintering temperature is 1 400 ℃. The microstructure of the alloy can be finer and more evenly distributed by adding Si. In addition to the Ti_3 Al phase,the alloy also contains Ti_5 Si_3 and Ti_5 Si_4 phase. The density and hardness of the alloy were increased by 19. 89% and 47% respectively with the content of Si 3% than without Si.
Ti-20 Al-xSi alloys( x = 0%,1%,2%,3%,4%,5%) were prepared in multi grade vacuum sintering furnace by powder metallurgic method. The microstructure and phase of the alloy were characterized by optical microscope( OM) and X-ray diffraction( XRD),and the density and Brinell hardness of the alloy were tested. The results show that the microstructure of Ti-20 Al-xSi alloy is uniform and fine when the sintering temperature is 1 400 ℃. The microstructure of the alloy can be finer and more evenly distributed by adding Si. In addition to the Ti_3 Al phase,the alloy also contains Ti_5 Si_3 and Ti_5 Si_4 phase. The density and hardness of the alloy were increased by 19. 89% and 47% respectively with the content of Si 3% than without Si.
引文
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[2]LIU Z C,LIN J P,LI S J,et al. Effects of Nb and Al on the microstructures and mechanical properties of high Nb containing Ti Al base alloys[J]. Intermetallics,2002,10(7):653-659.
[3]宋晓国,司晓庆,倪浩晨,等. Ni-34Ti钎料钎焊Ti Al合金接头界面结构及性能[J].焊接学报,2017,38(7):13-16.
[4]赵瑞峰,吴泽恩,吴珺,等. Ti Al合金中的氧扩散及恒温氧化研究现状[J].宇航材料工艺,2017,47(3):10-13.
[5]柳雨红,张莉. Si对Ti-46Al-5Hf-0. 6B合金凝固组织的影响[J].哈尔滨理工大学学报,2010,15(3):115-117.
[6]张熹雯,朱春雷,李海昭,等.微量Si改善铸造Ti Al合金定向层片组织持久性能研究[J].航空材料学报,2014,34(1):11-15.
[7]董利民,崔玉友,杨锐,等.元素Si对Ti Al合金抗氧化性能的影响[J].金属学报,2004,40(4):383-387.
[8]喻利花,薛安俊,董松涛,等. Si含量对Ti-Al-Si-N薄膜微结构与力学性能的影响[J].材料热处理学报,2010,31(7):140-145.
[9]张茜.石墨烯对粉末冶金Ti Al合金组织性能的影响[D].哈尔滨:哈尔滨工业大学,2015.
[10]马晓光,刘相法,丁海民.铝合金中Si含量对Al-Ti-C细化效果的影响[J].铸造,2008,57(5):491-493.
[11]王军,邵慧萍,郭志猛.低温真空扩散反应制备高性能Ti Al合金粉[J].稀有金属材料与工程,2013,42(6):1264-1267.
[12]戴景杰,张丰云,王阿敏,等. Nb掺杂对Ti-Al合金化层抗高温氧化性能的影响[J].材料工程,2017,45(2):24-31.
[13]陈树海. Ti/Al异种合金激光熔钎焊工艺与连接机理[D].哈尔滨:哈尔滨工业大学,2009.
[14]李东辉,吴玉程,李云,等.机械球磨与不同温度烧结下的Ti Al合金研究[J].合肥工业大学学报:自然科学版,2006,29(8):969-971.
[15]陈玉勇,杨非,孔凡涛,等.烧结温度对Ti Al合金块体材料组织和性能的影响[J].材料工程,2010(4):1-4.