Brazing of Aluminum Alloys with Titanium Alloys Using Rare-Earth Containing Aluminum Filler Metals

• Main Authors: Si-Min Mao, 毛璽閔
• Other Authors: Shih-Ying Chang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/33739211027418767197

碩士 === 國立雲林科技大學 === 機械工程系碩士班 === 97 === In the research, low-melting-point aluminum brazing filler metals based on Al-12Si were developed and used to join 6061 aluminum alloy with Ti6Al4V. The effects of the addition of copper, germanium, zinc and rare earth elements in Al-Si alloys upon the joining of aluminum alloy with titanium alloy were investigated. By way of differential thermal analysis (DTA), the melting points of Al-Si-Cu, Al-Si-Cu-Ge and Al-Si-Cu-Zn filler metals were determined. The results showed that the addition of Cu from 10 wt.% to 20 wt.% into the Al-Si eutectic alloy caused of the liquidus of Al-Si-Cu alloys decreased the from 570℃ to 535℃. An addition of 10 wt.% Ge into the Al-Si-Cu ternary alloys causes their liquidus temperatures about 22℃. Metallographic observations indicated that the addition of Cu and Ge into the Al-Si-Cu alloys would form Al2Cu intermetallic phase, Al-Si eutectic phase, silicon particles, Al-rich phase, and Si-Ge solid solution phase. An addition of 10 wt.% Zn and 0.1 wt.% Mm into the Al-Si-Cu ternary alloys have an average solidus temperature about 502℃. An addition of 0.1 wt.% Mm into the Al-Si-Cu-Zn filler metals formed an Al-La intermetallic compound. The shear strengths of 6061 aluminum alloy and Ti6Al4V joints using the Al-Si-Cu-Ge alloys were obviously higher than using the Al-Si-Cu-Zn alloys. Moreover, using the 0.1 wt.% Mm containing Al-Si-Cu-Ge to join 6061 aluminum alloy with Ti6Al4V, the shear strengths were higher than using Al-Si-Cu-Ge or Al-Si-Cu-Zn alloys. The average bonding shear strength of the 6061 aluminum alloy / Ti6Al4V joints brazed with Al-8.4Si-20Cu-10Ge-0.1Mm filler metal was above 50 MPa.