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93W/Ni/Ta擴(kuò)散焊接接頭的顯微結(jié)構(gòu)和力學(xué)性能
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國家自然科學(xué)基金 (11072228)；中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金 (2011-IV-038)


Microstructure and Mechanical Property of 93W/Ni/Ta Joints Welded
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    摘要:

    采用真空擴(kuò)散焊接的方法獲得了93W/Ni/Ta擴(kuò)散焊接接頭。利用萬能試驗(yàn)機(jī)測試焊接接頭剪切強(qiáng)度，通過XRD，SEM，EDS對焊接接頭的物相組成和顯微結(jié)構(gòu)進(jìn)行了分析。結(jié)果表明，93W/Ni/Ta擴(kuò)散焊接接頭剪切強(qiáng)度隨焊接溫度和保溫時間的增加而增加，最大值達(dá)到244 MPa。焊接接頭主要由Ni/Ta和93W/Ni界面組成，界面處金屬間化合物分別為hcp-Ni3Ta，fcc-Ni3Ta，Ni2Ta和Ni4W。接頭斷裂發(fā)生在Ni/Ta界面處，表明Ni/Ta界面為接頭的弱結(jié)合處。焊接接頭界面的形成主要分為物理接觸、固溶體形成、金屬間化合物形成和金屬間化合物長大4個階段

    Abstract:

    The vacuum diffusion bonding was used to weld 93W to Ta using Ni as an interlayer. Universal testing machine was used to test the shear strength of the bonded joint. The microstructure of the bonded joints was investigated by XRD, SEM and EDS. The results show that the shear strength increases with the increasing of bonding temperature and holding time, and exhibits a maximum value of 244 MPa. The joint is composed of the Ni/Ta and Ni/93W interface. The phases of hcp-Ni3Ta，fcc-Ni3Ta，Ni2Ta and Ni4W are formed in the interfaces. The fracture of the joint takes place in the Ni/Ta interface rather than the Ni/93W interface. The reaction process of the welding joints can be divided into the following stages: effective physical contact, solid solution forming, intermetallic reaction layer forming, and intermetallic layer growing.

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羅國強(qiáng),張 建,魏琴琴,沈 強(qiáng),張聯(lián)盟.93W/Ni/Ta擴(kuò)散焊接接頭的顯微結(jié)構(gòu)和力學(xué)性能[J].稀有金屬材料與工程,2014,43(1):233~236.[Luo Guoqiang, Zhang Jian, Wei Qinqin, Shen Qiang, Zhang Lianmeng. Microstructure and Mechanical Property of 93W/Ni/Ta Joints Welded[J]. Rare Metal Materials and Engineering,2014,43(1):233~236.]
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  • 收稿日期:2013-01-25
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  • 在線發(fā)布日期: 2014-04-16
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