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在温度为910℃,压力为3.4MPa条件下对TC4钛合金板材进行了扩散焊接,对获得的扩散焊接头取样进行金相观察,仅在接近接头表面材料深度为1mm范围内发现未焊合缺陷,其余部分焊合较好,表明在给定工艺下可获得质量良好的焊接头.随后对TC4扩散焊接头的力学性能进行了试验研究,分别开展了静拉伸试验、断裂韧性试验及焊缝附近区域的纳米压痕试验.试验结果表明,所制得的TC4扩散焊接头屈服强度为887MPa,抗拉强度为948MPa,断裂韧性为101.9MPa·m~(1/2),均与原材料的性能相差不大.纳米压痕试验的结果显示,接头焊缝区和母材区的显微弹性模量分别为180.2GPa和178.0GPa.
TC4 titanium alloy sheet was diffusion welded at the temperature of 910 ℃ and pressure of 3.4MPa. The obtained samples of diffusion welded joints were observed metallographically, and the unwelded defects were found only in the range of 1mm near the surface of the joint , The rest of the welding is good, indicating that in a given process to obtain good quality welded joints.Then the mechanical properties of TC4 diffusion welded joints were studied, respectively, the static tensile test, fracture toughness test and weld Nanoindentation test in the vicinity of the test results show that the obtained TC4 diffusion welded joint yield strength of 887MPa, tensile strength of 948MPa, fracture toughness of 101.9MPa · m ~ (1/2), both with the performance of raw materials The results of nano-indentation test showed that the micro-elastic modulus of joint weld zone and base metal zone were 180.2GPa and 178.0GPa respectively.