Al-Mg系5083合金と軟鋼との摩擦圧接継手の界面強度に対する界面層の影響

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The metallographic factor controlling the strength of friction-welded interface of mild steel to Al-Mg alloy A5083 has been investigated by TEM observations. The bond strength, estimated from the tensile strength of a specimen with a circumferential notch at the interface, rose rapidly with an increase in friction time, and then reduced. A maximum strength of 311 MPa was obtained at a friction time t_1 of 2s (rotation speed=20_s^<-1>, friction pressure=40MPa, and forge pressure=230MPa). At a friction time of 1s, an interfacial layer about 100nm wide that consisted of (Fe, Mn)Al_6 and Mg_2Si was formed at the interface, and an Al oxide layer of width less than 10nm was observed between the (Fe, Mn)Al_6 layer and mild steel substrate. The joint bonded at t_1=1s was fractured mainly along the Al oxide layer. In a joint showing the highest bond strength (t_1=2s), no Al oxide layer could be detected between the mild steel substrate and interfacial layer, which consisted of (Fe, Mn)Al_6, Fe_4Al_<13>, Fe_2Al_5, and Mg_2Si. The width of the interfacial layer was increased to about 300nm at t_1=2s. The fracture occurred along the IMC layer of (Fe, Mn)Al_6, Fe_4Al_<13> and Fe_2Al_5. At t_1 of 4s, a layer of MgAl_2O_4 about 100nm in width was observed in addition to the intermetallic compounds observed at t_1=2-3s. The crack on the tensile test was propagated mainly along the MgAl_2O_4 layer. Thus the controlling phase of the bond strength was altered from the Al oxide film, intermetallic compound layer, and MgAl_2O_4 layer, depending on friction time. The formation mechanisms of the observed interfacial phases are discussed from a metallographic point of view.
社団法人溶接学会の論文
2005-08-05

Al-Mg系5083合金と軟鋼との摩擦圧接継手の界面強度に対する界面層の影響

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