124 析出強化型Al-Zn-Mg-Cu冶金(A7075)摩擦圧接継手の引張特性と硬さ分布(材料工学II)(オーガナイズドセッション(a)材料力学・材料強度に関する新展開)

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This report describes effects of friction time, diameter of the base metals and age-strengthened heat treatment after joining (ASHT) on the mechanical and metallurgical properties of Al-Zn-Mg-Cu alloy (A7075) friction weld joint. The joint tensile strength decreased with increasing friction time from 0.5 to 6s in as-welded (AW) and ASHT conditions. The strength was increased approximately 50MPa by ASHT than that of AW joint. The width of the softened region occurred during friction joining operation, i.e., solution treated region, increased with increasing friction time. The hardness of the softened regions could not recovered to that of as-received one by ASHT. There was slight difference in the distributions of the softened regions among 8, 12 and 16mm diameter joints. The hardness of the softened regions could not also recovered to that of as-received one by ASHT. This reason can be explained as the size, number and distribution (dispersion) of precipitates in crystal grains, or at grain boundaries.
一般社団法人日本機械学会の論文
2000-09-25