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TiAl與Ni基合金接觸反應(yīng)釬焊接頭界面組織及性能
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中央高校基本科研業(yè)務(wù)費專項資金 (HIT.BRET1.2010006，HIT.NSRIF.2010119)；國家自然科學基金（51021002，E050803）


Interfacial Structure and Properties of Reactive Brazing Joints of TiAl/Ni-based Alloy
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    摘要:

    以Ti為中間層實現(xiàn)了TiAl與Ni基合金的接觸反應(yīng)釬焊。采用掃描電鏡和電子探針等手段對釬焊接頭的界面結(jié)構(gòu)及生成相進行分析，并對接頭剪切強度進行測試。結(jié)果表明：當釬焊溫度為960 ℃時，釬縫主要由Tiss和Ti2Ni組成；當釬焊溫度從960 ℃升高到1000 ℃時，釬縫中生成Ti-Al及Al-Ni-Ti化合物，典型界面結(jié)構(gòu)為：GH99/(Ni,Cr)ss/Ti2Ni+AlNi2Ti+TiNi/Ti3Al+Al3NiTi2/Ti3Al+Al3NiTi2/TiAl；釬焊溫度繼續(xù)升高，Ti3Al和Al3NiTi2變得粗大，導(dǎo)致接頭性能下降。當釬焊溫度為1000 ℃，保溫10 min時，接頭剪切強度達到最大值233 MPa。隨釬焊溫度的升高，釬縫厚度先增加后減小。

    Abstract:

    TiAl alloy and Ni-based alloy were joined by vacuum reactive brazing using Ti foil as the interlayer. Interfacial microstructure and formation phases of the brazed joint were investigated by means of scanning electron microscope and electron probe microanalysis, and shear strength of the joint was determined. The results show that the brazed joint is mainly composed of Tiss and Ti2Ni when brazed at 960 °C; when the brazing temperature increases from 960 °C to 1000 °C, Ti-Al and Al-Ni-Ti compounds form in the brazing seam and the typical interface structure of the brazed joint is GH99/(Ni,Cr)ss/Ti2Ni+AlNi2Ti+TiNi/Ti3Al+Al3NiTi2/Ti3Al+Al3NiTi2/TiAl. Further increasing the brazing temperature results in excessive growth of Ti3Al and Al3NiTi2 phase, which reduces the joining properties. The shear strength of the joint reaches a maximum of 233 MPa when brazed at 1000 oC for 10 min. With the brazing temperature increasing, the thickness of the brazing seam increases firstly and then decreases.

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李海新,林鐵松,何 鵬,王顯軍,馮吉才. TiAl與Ni基合金接觸反應(yīng)釬焊接頭界面組織及性能[J].稀有金屬材料與工程,2012,41(11):1945~1949.[Li Haixin, Lin Tiesong, He Peng, Wang Xianjun, Feng Jicai. Interfacial Structure and Properties of Reactive Brazing Joints of TiAl/Ni-based Alloy[J]. Rare Metal Materials and Engineering,2012,41(11):1945~1949.]
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  • 收稿日期:2011-11-08
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