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First Phase Selection in Solid Ti/Al Diffusion Couple
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First Phase Selection in Solid Ti/Al Diffusion Couple
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National Natural Science Foundation of China (50771041); New Century Excellent Talents in University (05-0350)

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    摘要:

    Ti/Al diffusion couples fabricated by hot pressing were annealed at 525, 550, 575 and 600 oC. TiAl3 was the only observed phase at the Ti/Al interface when the unreacted Al foils remained. TiAl3 grew towards Al foil side. Few Al atoms were detected in Ti foils. The first formation of TiAl3 is explained on the basis of solubility limits of terminal solid solution, lattice mismatch among Al, Ti and TiAl3, and the increasing interfacial energy caused by newly formed interface. The first saturation of Al (Ti) solid solution due to the little solubility of Ti in Al, and the slight misfit among the close-packed planes of Al, Ti and TiAl3, advance the nucleation of TiAl3. TiAl3, rather than other compounds, has the lowest increasing interfacial energy, indicating its preferential formation. The formation of other titanium aluminides is suppressed due to their growth which is kinetically unstable

    Abstract:

    Ti/Al diffusion couples fabricated by hot pressing were annealed at 525, 550, 575 and 600 oC. TiAl3 was the only observed phase at the Ti/Al interface when the unreacted Al foils remained. TiAl3 grew towards Al foil side. Few Al atoms were detected in Ti foils. The first formation of TiAl3 is explained on the basis of solubility limits of terminal solid solution, lattice mismatch among Al, Ti and TiAl3, and the increasing interfacial energy caused by newly formed interface. The first saturation of Al (Ti) solid solution due to the little solubility of Ti in Al, and the slight misfit among the close-packed planes of Al, Ti and TiAl3, advance the nucleation of TiAl3. TiAl3, rather than other compounds, has the lowest increasing interfacial energy, indicating its preferential formation. The formation of other titanium aluminides is suppressed due to their growth which is kinetically unstable

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Liu Jiangping, Su Yanqing, Xu Yanjin, Luo Liangshun, Guo Jingjie, Fu Hengzhi. First Phase Selection in Solid Ti/Al Diffusion Couple[J].稀有金屬材料與工程,2011,40(5):753~756.[Liu Jiangping, Su Yanqing, Xu Yanjin, Luo Liangshun, Guo Jingjie, Fu Hengzhi. First Phase Selection in Solid Ti/Al Diffusion Couple[J]. Rare Metal Materials and Engineering,2011,40(5):753~756.]
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  • 收稿日期:2010-05-20
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