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TiAl基合金與Ni基合金釬焊連接接頭界面組織及性能
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國家自然科學(xué)基金項(xiàng)目 (50975062, 51105107, 51021002); 黑龍江省自然科學(xué)基金項(xiàng)目(QC2011C044); 高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金優(yōu)先發(fā)展領(lǐng)域課題資助項(xiàng)目(20112302130005)


Interfacial Microstructure and Properties of Brazing Joints of TiAl/Ni-Based Alloy
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    摘要:

    采用BNi2釬料實(shí)現(xiàn)了TiAl基合金與Ni基高溫合金的釬焊。采用掃描電鏡、能譜分析和X射線衍射等手段對釬焊接頭的界面組織結(jié)構(gòu)及生成相進(jìn)行分析，并對接頭的抗剪強(qiáng)度進(jìn)行測試。結(jié)果表明，釬焊接頭的典型界面結(jié)構(gòu)為：GH99/(Ni)ss (γ)+Ni3B+CrB+富Ti-硼化物/TiNi2Al/TiNiAl+Ti3Al/TiAl；隨著釬焊溫度的升高或保溫時(shí)間的延長，較多的B和Si元素?cái)U(kuò)散進(jìn)入兩側(cè)母材，導(dǎo)致釬縫中硼化物數(shù)量減少，而TiAl/釬縫界面的TiNi2Al和TiNiAl+Ti3Al金屬間化合物層厚度增加；當(dāng)釬焊溫度為1050 ℃，保溫時(shí)間為5 min時(shí)，接頭的抗剪強(qiáng)度達(dá)到最大為205 MPa，接頭主要斷裂于TiNiAl金屬間化合物層。當(dāng)釬焊溫度升高或保溫時(shí)間繼續(xù)延長時(shí)，TiNiAl厚度顯著增加，導(dǎo)致接頭強(qiáng)度下降

    Abstract:

    The BNi2 filler metal was used to join TiAl-based alloy to Ni-based alloy. Interfacial microstructure and formation phases of brazed joints were investigated by means of scanning electron, energy disperses spectroscopy and X-ray diffraction, and shear strength of the joints was determined. The results show that the typical interfacial microstructure of the joints is GH99/γ+Ni3B+CrB+rich Ti-boride/TiNi2Al/TiNiAl+Ti3Al/TiAl. With the increase of brazing temperature or holding time, more B and Si elements diffuse from the molten brazing filler metal into substrates, which decrease the amount of boride in the joint, while the thickness of TiNi2Al and TiNiAl+Ti3Al increases. When the brazing temperature T=1050 ℃ and the holding time t=5 min, the shear strength of the joints reaches a maximum of 205 MPa, and the joint is mainly fractured at TiNiAl intermetallic layer. Further increase the brazing temperature or holding time results in excessive growth of TiNiAl layer, which reduces the joining properties

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何 鵬,李海新,林鐵松,馮吉才. TiAl基合金與Ni基合金釬焊連接接頭界面組織及性能[J].稀有金屬材料與工程,2013,42(11):2248-2252~.[He Peng, Li Haixin, Lin Tiesong, Feng Jicai. Interfacial Microstructure and Properties of Brazing Joints of TiAl/Ni-Based Alloy[J]. Rare Metal Materials and Engineering,2013,42(11):2248-2252~.]
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  • 收稿日期:2012-11-20
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