鈦基非晶填料應用於Ti-6Al-4V合金硬焊之微結構及機械性能研究;Interfacial microstructure and shear strength of Ti-6Al-4V alloy joints vacuum brazed with Ti-based amorphous filler

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题名:	鈦基非晶填料應用於Ti-6Al-4V合金硬焊之微結構及機械性能研究;Interfacial microstructure and shear strength of Ti-6Al-4V alloy joints vacuum brazed with Ti-based amorphous filler
作者:	賴承孝;LAI, CHENG-HSIAO
贡献者:	機械工程學系在職專班
关键词:	鈦基合金;非晶填料;真空硬焊;顯微組織;Ti-based alloy;Amorphous filler;Vacuum brazing;Microstructure
日期:	2022-07-20
上传时间:	2022-10-04 12:11:41 (UTC+8)
出版者:	國立中央大學
摘要:	本研究係使用本實驗室開發之Ti42Zr35Ta3Si5Sn2.5Co12.5無毒性、生物相容性佳鈦基非晶粉末，作為Ti-6Al-4V的硬焊填料進行真空硬焊。本研究分別進行了1000℃、1050℃及1100℃不同溫度的真空硬焊，可發現本非晶填料之黏度相當高，不利毛細作用將熔融填料滲入接合間隙，但使用夾心式的填料方式可得到良好的接合表面。拉伸試驗結果發現剪力強度與溫度呈正相關，在1100℃持溫45分鐘的條件下可得到最佳的剪力強度170MPa。在金相及SEM/EDS分析的部分可發現1050℃時焊道與母材之間有明顯的反應層，且組織係由α-Ti、β-Ti及Ti基介金屬化合物所組成，而1100℃下基本上皆已看不到反應層，可看到粗大的β-Ti晶界上析出針狀的α-Ti。破斷面的部分可觀察到皆為窩穴狀的韌性破斷，並無因介金屬化合物析出而造成脆性破斷。;Ti42Zr35Ta3Si5Sn2.5Co12.5 is a novel amorphous materials, which has non-toxic property and high biocompatibility in human body. In this research, this novel materials was used as the brazing filler for Ti-6Al-4V for vacuum brazing. Vacuum brazing was carried out at different temperatures of 1000 °C, 1050 °C and 1100 °C. It can be found that the viscosity of the molten amorphous filler is quite high, which is difficult for capillary action to penetrate into the joint clearance. However, a good joint can be obtained by using a sandwich-type filling method. The tensile test results show that the shear strength is positively correlated with the temperature, and the best shear strength of 170MPa can be obtained at 1100℃ for 45 minutes. It can be found that there is an obvious reaction layer between the weld bead and the base metal at 1050 ℃, and the microstructure is composed of α-Ti, β-Ti and Ti-based intermetallic compounds. While 1100℃, needle-like α-Ti could be found on the coarse β-Ti grain boundary. All the ductile fractures in the shape of dimple can be observed in the fractured surface, and there is no brittle fracture caused by the precipitation of intermetallic compounds.
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