Interfacial reaction mechanism of TiBw/Ti6Al4V composites and Inconel 718 alloys by GTAW heat transmission
Interfacial reaction mechanism of TiBw/Ti6Al4V composites and Inconel 718 alloys by GTAW heat transmission
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GTAW 传热研究 TiBw/Ti6Al4V 复合材料与 Inconel 718 合金的界面反应机理
DOI：
10.1007/s11431-019-1452-8
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发表时间：
2019-11
期刊：
影响因子：
--
通讯作者：
Geng Lin
中科院分区：
文献类型：
--
作者：
Gao YaNan;Huang LuJun;Sun Yuan;An Qi;Zhang Jie;Geng Lin
采用气体钨极电弧焊（GTAW）传热，获得了TiBw/Ti6Al4V复合材料与Inconel 718合金良好的接头。对接头的界面反应机理进行了详细的研究和分析。由于热输入作用于TiBw/Ti6Al4V复合材料表面，在TiBw/Ti6Al4V复合材料与Inconel 718合金的界面处出现了固相反应层。随着热输入的增加，反应层的厚度明显增加。反应层的形成主要依赖于Ti和Ni元素在焊接过程中通过界面扩散形成固溶体和金属间化合物。反应层可分为富钛区（第2层）和富镍区（第1层）。富ni区以相对粗大的枝晶为主，富ti区以较脆的Ti2Ni等IMCs为主。反应层的显微硬度远高于母材。而在富ti区和富ni区之间，由于TiNi的形成，硬度略有下降。
A good joint of TiBw/Ti6Al4V composites and Inconel 718 alloys was obtained by Gas Tungsten Arc Welding (GTAW) heat transmission. The interfacial reaction mechanism of joint was investigated and analyzed in details. Owing to the heat input applied on the surface of TiBw/Ti6Al4V composites, a solid-state reaction layer appeared at the interface of TiBw/Ti6Al4V composites to Inconel 718 alloys. The thickness of the reaction layer was obviously increased with increasing heat input. Developing of reaction layer mainly depended on the diffusion of elements of Ti and Ni through the interface during welding to form solid solutions and intermetallic compounds (IMCs). The reaction layer can be divided into Ti-rich zone (layer 2) and Ni-rich zone (layer 1). In Ni-rich zone, relatively coarse dendrites were the predominant, however, more brittle IMCs like Ti2Ni were found in the Ti-rich zone. Micro hardness of reaction layer was much higher than that of base metal. While a slight decrease of hardness was found between Ti-rich zone and Ni-rich zone due to the formation of TiNi.
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