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贺永东,曾慧楠,邢诗雨,李鹏,何蕾,赵毕文,李琛,张媛庆.氢化钛-石墨制备Al-Ti-C母合金机理与组织性能研究[J].稀有金属材料与工程(英文),2019,48(4):1345~1351.[heyongdong,zenghuinan,xingshiyu,lipeng,helei,zhaobiwen,lichen and zhangyuanqing.Mechanism and microstructure properties of Al-Ti-C mother alloy prepared by titanium hydride-graphite[J].Rare Metal Materials and Engineering,2019,48(4):1345~1351.]
Mechanism and microstructure properties of Al-Ti-C mother alloy prepared by titanium hydride-graphite
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Received:December 28, 2017  Revised:January 17, 2018
DOI:
Key words: titanium hydride  graphite  cryolite  dendritic structure  Al-Ti-C mother alloy
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目),新疆维吾尔自治区科技厅高技术发展计划项目
Author NameAffiliation
heyongdong,zenghuinan,xingshiyu,lipeng,helei,zhaobiwen,lichen and zhangyuanqing  
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Abstract:
      The microstructure and properties of Al-Ti-C master alloy prepared by titanium hydride and graphite were studied by X ray diffraction (XRD)、scanning electron microscope (SEM) and energy dispersive spectrometer (EDS).The results show that the mechanism of Al-Ti-C alloy prepared by the reaction of titanium hydride-graphite and aluminum liquid is that (1) Titanium hydride and graphite are respectively used as titanium and carbon sources, and titanium and hydrogen are obtained by thermal decomposition of titanium hydride.(2)Titanium react with aluminum and graphite to form titanium-aluminum、titanium-carbon or carbon-aluminum compounds.(3) Titanium aluminum, carbon aluminum and titanium carbon compounds have refined Al-Ti-C alloy.The phase composition of the alloy includes α(Al), Ti-Al,C-Al, Ti-C compounds and other phases. The microscopic structure is equiaxed or dendrite structure, and the average grain size is 20~40μm.There are needle like or rod like primary crystals in the alloy matrix. There are petal like primary crystals containing titanium, carbon, iron and silicon on the grain boundaries. The titanium and carbon elements distribute evenly along the grain boundaries and the grains. There is obvious titanium and carbon enrichment and segregation near the primary phase.Cryolite is conducive to the wetting and reaction of carbon and aluminum, the second phase generated more fully and uniform diffusion in the grain.