Microstructure and melting properties of Ag–Cu–In intermediate-temperature brazing alloys
来源期刊：Rare Metals2015年第5期
论文作者：Xue Ma Liang-Feng Li Zu-Hua Zhang Hao Wang En-Ze Wang Tai Qiu
文章页码：324 - 328
摘 要：The microstructure and melting properties of ternary Ag–Cu–In intermediate-temperature alloys（400–600 °C） prepared by electric arc melting were investigated in this work. The melting properties, phase compositions, microstructure and hardness were characterized by differential scanning calorimetry（DSC）, X-ray diffraction（XRD）, scanning electron microscopy（SEM）and micro-hardness tester, respectively. The results show that the melting properties, phase compositions, microstructure and hardness of Ag–Cu–In brazing alloys are substantially different when adding different levels of indium. Indium element could effectively reduce the melting temperatures of（Ag–Cu28）–x In alloys, and the melting temperatures of（Ag–Cu28）–25In alloy are located at 497.86 and 617.48 °C. When the indium content varies from 5 wt% and 10 wt%, the dominant phases in the alloys are Ag-rich and Cu-rich phases, and their granular crystals are smaller than 0.5 lm. When the indium content is higher than 15 wt%, the phase compositions of the alloy are Ag4 In and Cu11In9, and the microstructure exhibits dendritic crystals with a uniform distribution. The hardness of（Ag–Cu28）–x In alloy decreases first and then increases with the content of indium increasing, and the highest hardness of（Ag–Cu28）–25In alloy is HV 266.0.
Xue Ma1，Liang-Feng Li1,2，Zu-Hua Zhang2，Hao Wang2，En-Ze Wang1，Tai Qiu3
1. School of Materials Science and Engineering, Southwest University of Science and Technology2. Centre of Excellence in Engineered Fibre Composites (CEEFC),Faculty of Health, Engineering and Sciences, University of Southern Queensland3. College of Materials Science and Engineering, Nanjing University of Technology
摘 要：The microstructure and melting properties of ternary Ag–Cu–In intermediate-temperature alloys（400–600 °C） prepared by electric arc melting were investigated in this work. The melting properties, phase compositions, microstructure and hardness were characterized by differential scanning calorimetry（DSC）, X-ray diffraction（XRD）, scanning electron microscopy（SEM）and micro-hardness tester, respectively. The results show that the melting properties, phase compositions, microstructure and hardness of Ag–Cu–In brazing alloys are substantially different when adding different levels of indium. Indium element could effectively reduce the melting temperatures of（Ag–Cu28）–x In alloys, and the melting temperatures of（Ag–Cu28）–25In alloy are located at 497.86 and 617.48 °C. When the indium content varies from 5 wt% and 10 wt%, the dominant phases in the alloys are Ag-rich and Cu-rich phases, and their granular crystals are smaller than 0.5 lm. When the indium content is higher than 15 wt%, the phase compositions of the alloy are Ag4 In and Cu11In9, and the microstructure exhibits dendritic crystals with a uniform distribution. The hardness of（Ag–Cu28）–x In alloy decreases first and then increases with the content of indium increasing, and the highest hardness of（Ag–Cu28）–25In alloy is HV 266.0.
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