Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy
Jin Hao1,2; Jia Qing1; Liu Ronghua1; Xian Quangang1; Cui Yuyou1; Xu Dongsheng1; Yang Rui1
Corresponding AuthorYang Rui(
AbstractButton ingots were prepared by arc melting and feed bars for directional solidification were prepared by optimized drop casting technique. The Ti-43Al-3Si directionally solidified bars with lamellar boundaries perpendicular to the growth direction were prepared at the growth rate of 180 mm/h in an optical floating zone furnace. Cylindrical sections were cut from these perpendicular lamellae with appropriate direction and then fixed on polycrystalline TiAl bars by mechanical setting method to serve as the initial seeds. The ultimate Ti-43Al-3Si seeds with parallel lamellar microstructure were successfully prepared from these initial seeds at the growth rate of 5 mm/h. To avoid the nucleation of stray grains, drop-cast bars with the shape of frustum of a cone were used for the preparation of ultimate seeds. At the growth rates of 5 and 180 mm/h, the primary phase of Ti-43Al-3Si alloy was always the a phase. Polysynthetically twinned (PST) crystals of Ti-47Al alloy were obtained from the Ti-43Al-3Si ultimate seeds and the seeding process was studied by microscopic analysis. Lamellar microstructure of the seed kept stable and recrystallization of the seed was not found. Lamellar orientation of Ti-47Al PST crystals was successfully controlled by the ultimate Ti-43Al-3Si seed.
KeywordTiAl alloy polysynthetically twinned crystal seed technique directional solidification optical floating zone furnace
Funding OrganizationNational Natural Science Foundation of China
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[51701209]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000497774900005
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYang Rui
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Jin Hao,Jia Qing,Liu Ronghua,et al. Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy[J]. ACTA METALLURGICA SINICA,2019,55(12):1519-1526.
APA Jin Hao.,Jia Qing.,Liu Ronghua.,Xian Quangang.,Cui Yuyou.,...&Yang Rui.(2019).Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy.ACTA METALLURGICA SINICA,55(12),1519-1526.
MLA Jin Hao,et al."Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy".ACTA METALLURGICA SINICA 55.12(2019):1519-1526.
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