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Reaction-Diffusion Bonding of High Nb Containing TiAl Alloy
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Reaction-Diffusion Bonding of High Nb Containing TiAl Alloy
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National Basic Research Program of China (2011CB605505)；Research Fund of Harbin Institute of Technology at Weihai (HIT(WH)201208)

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    摘要:

    采用Al箔作中間層在1200 ℃/2 h條件下通過反應(yīng)擴(kuò)散連接成功實(shí)現(xiàn)了高鈮TiAl合金（TAN）的焊接，深入研究了接頭的界面微觀組織結(jié)構(gòu)和連接機(jī)理。結(jié)果表明：連接過程中Al箔熔化成液相后與高鈮TiAl反應(yīng)在接頭中形成了連續(xù)的TiAl3化合物層；在高溫?cái)U(kuò)散作用下，TiAl3化合物逐漸轉(zhuǎn)變?yōu)棣?TiAl相；最后經(jīng)焊后熱處理形成了γ+α2層片組織。另外，當(dāng)直接采用高鈮TiAl合金的熱處理工藝進(jìn)行焊接時(shí)，亦可以獲得具有層片組織的接頭

    Abstract:

    In this study, high Nb containing TiAl alloy (TAN) was welded by reaction-diffusion bonding using Al foil as interlayer at 1200 °C for 2 h. The desired full lamellar microstructure (γ+α2) was obtained across the bonding seam when the joint was heat-treated according to the heat treatment process of TAN alloy. The present paper also investigated microstructure and bonding mechanism in details. The results show that liquid Al can react with TAN to form TiAl3 intermetallic layer, and then the TiAl3 layer will transform to γ-TiAl by solid-state diffusion at high temperature, finally a full lamellar structure is formed after heat treatment. Furthermore, sound joints with full lamellar structure can be also obtained when TAN alloy is directly bonded in accordance with the heat treatment cycle of TAN alloy

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宋曉國(guó),曹 健,劉甲坤,趙立巖,馮吉才. Reaction-Diffusion Bonding of High Nb Containing TiAl Alloy[J].稀有金屬材料與工程,2014,43(1):28~31.[Song Xiaoguo, Cao Jian, Liu Jiakun, Zhao Liyan, Feng Jicai. Reaction-Diffusion Bonding of High Nb Containing TiAl Alloy[J]. Rare Metal Materials and Engineering,2014,43(1):28~31.]
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  • 收稿日期:2013-02-25
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  • 在線發(fā)布日期: 2014-04-16
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