钎焊温度对微纳米Ti-Cu-Ni-Nb-Al-Hf钎料真空钎焊γ-TiAl接头组织和抗拉强度的影响

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中文摘要：采用自主研制的新型Ti-10Cu-10Ni-8Al-8Nb-4Zr-1.5Hf微纳米钎料,在钎焊温度1160～1220 ℃、钎焊时间30 min的工艺参数下真空钎焊连接Ti-47Al-2Nb-2Cr-0.15B合金.研究TiAl钎焊接头的界面组织和形成机理,以及钎焊温度、界面组织和接头强度之间的内在联系.结果表明,钎焊温度1160和1180 ℃的TiAl接头均由三个界面反应层组成,主要物相均为α2-Ti3Al、τ3-Al3NiTi2和Ti2Ni.然而,当钎焊温度为1200和1220 ℃时,由于具有壁垒效应的连续α2-Ti3Al层被打破,导致钎缝中未见明显分层,τ3-Al3NiTi2完全取代Ti2Ni且均匀分布在钎缝中.当钎焊温度为1200 ℃时,钎焊接头的抗拉强度显著提高,最大抗拉强度为343 MPa.需特别指出的是,在不同钎焊温度下,溶解的TiAl母材中向外扩散的Al是影响钎焊接头组织演变和抗拉强度的主控因素.

外文标题：Effect of brazing temperature on micro structure and tensile strength of γ-TiAl joint vacuum brazed with micro-nano Ti-Cu-Ni-Nb-Al-Hf filler

外文摘要：A novel micro-nano Ti-10Cu-10Ni-8Al-8Nb-4Zr-1.5Hf filler was used to vacuum braze Ti-47A1-2Nb-2Cr-0.15B alloy at 1160-1220 ℃ for 30 min.The interfacial microstructure and formation mechanism of TiAl joints and the relationships among brazing temperature,interfacial microstructure and joint strength were emphatically investigated.Results show that the TiAl joints brazed at 1160 and 1180 ℃ possess three interfacial layers and mainly consist of α2-Ti3Al,τ3-Al3NiTi2 and Ti2Ni,but the brazing seams are no longer layered and Ti2Ni is completely replaced by the uniformly distributed r3-Al3NiTi2 at 1200 and 1220 ℃ due to the destruction of α2-Ti3Al barrier layer.This transformation at 1200 ℃ obviously improves the tensile strength of the joint and obtains a maximum of 343 MPa.Notably,the outward diffusion of Al atoms from the dissolution of TiAl substrate dominates the microstructure evolution and tensile strength of the TiAl joint at different brazing temperatures.

外文关键词：

γ-TiAl alloymicro-nano fillervacuum brazinginterfacial microstructuretensile strength

作者：

李力、陈昱橦、袁雷昕、罗芬、冯志雪、李小强

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作者单位：

华东交通大学材料科学与工程学院,南昌 330013

华东交通大学轨道交通基础设施性能监测与防护国家重点实验室,南昌 330013

华南理工大学国家金属材料近净成形工程技术研究中心,广州 510640

关键词：

γ-TiAl合金微纳米钎料真空钎焊界面显微组织抗拉强度

基金：

National Natural Science Foundation of ChinaNatural Science Foundation of Jiangxi Province,ChinaOpen Foundation of National Engineering Research Center of Nearnetshape Forming for Metallic Materials,ChinaScience Foundation of Educational Department of Jiangxi Province,ChinaGF Basic Scientific Research Project,ChinaCivil Population Supporting Planning and Development Project,China

项目编号：

5186501220202BABL2040402016005GJJ170372JCKY2020205C002JPPT125GH038

出版年：

2024

DOI：

10.1016/S1003-6326(24)66560-X

中国有色金属学报(英文版)

中国有色金属学会

中国有色金属学报(英文版)

CSTPCD

影响因子：1.183

ISSN：1003-6326

年,卷(期)：2024.34(8)