Behavior of Interfacial Oxide during Diffusion Bonding of Aluminum Alloys and Its Influence on Joint Strength(Materials, Metallurgy & Weldability)

概要

論文の詳細を見る
In order to investigate the interfacial phase formed during the diffusion bonding of the aluminumm alloy and to discuss its influence on the bond strength, TEM observations have been carried out for joint interfaces of commercial aluminum alloys: Al-Mg-Si alloy 6063, Al-Mg alloy 5005, and Al-Zn-Mg alloy 7N01. At the joint interfaces of these alloys, amorphous oxide films were observed and they were altered gradually to crystalline oxide particles, as the bonding temperature was increased. The bonding temperature at which the amorphous oxide film disappeared lowered with increasing the Mg content. As the area occupied by the amorphous oxide film was decreased, the tensile strength of the joints of all the alloys increased significantly, suggesting that the amorphous oxide was a major factor that decreased the bond strength. At all bonding temperatures employed, the crystalline oxides at the joint interfaces of 6063 and 7N01 alloys were identified as Al_2MgO_4 and MgO, respectively. In contrast, at the joint interface of 5005 alloy, both the crystalline oxides were observed depending on bonding temperature T_w ; i.e., Al_2MgO_4 and MgO at T_w below 853K, and Al_2MgO_4 at T_w above 853K In addition, particulate intermetallic compounds much larger than the crystalline oxides were precipitated preferentially at the joint interface even compared with the grain boundary. These precipitates observed in the joints of 6063 and 7N01 alloys were identified as Mg_2Si and MgZn_2, respectively. Although the fracture morphology of the joint suggested that these precipitates acted as initiation sites of dimples in tensile tests, it can be considered that they have much less influence on the bond strength than the amorphous oxide film, since solution treatments for dissolving these precipitates resulted in only slight improvement in the tensile strength.
大阪大学の論文

Behavior of Interfacial Oxide during Diffusion Bonding of Aluminum Alloys and Its Influence on Joint Strength(Materials, Metallurgy & Weldability)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク