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Fabrication and analysis of TIG welding-brazing butt joints of in-situ TiB2/7050 composite and TA2
Defence Technology ( IF 5.1 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.dt.2020.06.022
Huan-huan Sun , Yi-bo Ren , Yang Feng , Hao-qiang Ba , Dong Chen , Chun-juan Xia , Hao-wei Wang

Lightweight hybrid structures of Al MMCs and titanium alloy dissimilar materials have great prospect in the defence industry application. So, it is necessary to join Al MMCs with Ti metal to achieve this structural design. In this work, in-situ TiB2/7050 composite and TA2 were firstly attempted to join by TIG welding-brazing technique. The result was that the intact welding-brazing butt joint was successfully fabricated. The joint presents dual characteristics, being a brazing on TA2 side and a welding on TiB2/7050 side. At brazing joint side, ER4043 filler metal effectively wets on TA2 under TIG heating condition, and a continuous interfacial reaction layer with 1–3 μm is formed at welded metal/TA2 interface. The whole interfacial reaction layers are composed of Ti(AlSi)3 intermetallic compounds (IMCs), but their morphologies at the different regions present obvious distinguishes. The microhardness of the reaction layers is as much as 141–190 HV. At welding joints side, the fusion zone appears the equixaed crystal structure, and the grain sizes are much smaller than those of welded metal, which is attributed to the effect of TiB2 particulates from the melted TiB2/7050 on acceleration formation and inhibiting growth for the new crystal nucleus. The tensile test results show that average tensile strength of the optimal welding-brazing joint is able to achieve 138 MPa. The failure of the tensile joint occurs by quasi-cleavage pattern, and the cracks initiate from the IMCs layer at the groove surface of TA2 and propagate into the welded metal.



中文翻译:

制造和TIG的分析焊接钎焊的对接接头原位的TiB 2 /7050复合物和TA2

Al MMC与钛合金异种材料的轻质混合结构在国防工业中具有广阔的应用前景。因此,有必要将Al MMC与Ti金属结合起来以实现这种结构设计。在这项工作中,在原位的TiB 2 /7050复合物和TA2为首次尝试通过TIG焊接钎焊技术来加入。结果是成功地制造了完整的焊接-钎焊对接接头。关节礼物双重特性,作为上侧TA2钎焊和上的TiB焊接2 /7050侧。在TIG加热条件下,在钎焊接头侧,ER4043填充金属可有效地润湿TA2,并在焊接的金属/ TA2界面处形成1-3μm的连续界面反应层。整个界面反应层均由Ti(AlSi)组成3种金属间化合物(IMC),但它们在不同区域的形态存在明显区别。反应层的显微硬度高达141–190 HV。在焊接接头侧,熔化区出现等晶体结构,并且晶粒尺寸比焊接金属的晶粒小得多,这归因于熔化的TiB 2产生的TiB 2颗粒效应/ 7050对新晶核的加速形成和抑制生长具有抑制作用。拉伸试验结果表明,最佳的钎焊接头的平均拉伸强度能够达到138 MPa。拉伸接头的失效是由准解理图案引起的,裂纹从TA2槽表面处的IMCs层开始并传播到焊接金属中。

更新日期:2020-06-30
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