2060合金FSW接頭微觀組織與力學(xué)性能Microstructures and mechanical properties of 2060 alloy FSW joint

利用金相顯微鏡、顯微硬度測(cè)試、拉伸性能測(cè)試、掃描電鏡、透射電鏡等手段對(duì)2060T8合金攪拌摩擦焊(FSW)接頭的微觀組織和力學(xué)性能進(jìn)行研究。結(jié)果表明：焊接頭的抗拉強(qiáng)度為441 MPa，屈服強(qiáng)度為320 MPa，伸長(zhǎng)率為6.9%，但焊接強(qiáng)度系數(shù)達(dá)到82.9%；經(jīng)過(guò)攪拌摩擦焊，母材的織構(gòu)類型以及強(qiáng)度發(fā)生了變化，由黃銅織構(gòu)變?yōu)楦咚箍棙?gòu)且強(qiáng)度變?nèi)酰粺嵊绊憛^(qū) T1 相(Al2CuLi)部分發(fā)生了溶解，析出了 δ′相(Al3Li)，熱機(jī)影響區(qū)內(nèi) T1 相大部分溶解，S′相(Al2CuMg)發(fā)生了粗化，焊核區(qū)析出相全部溶解。

The 2060T8 FSW joint was studied by means of metallographic microscope, microhardness test, tensile test, SEM and TEM on the microstructure and mechanical properties. The results show that the tensile strength is 441 MPa, the yield strength is 320 MPa and the elongation is 6.9%. But the joint strength coefficient is 82.9%. The texture type and intensity of base material change after FSW, and the texture type changes from Bass texture to Gauss texture and the intensity decreases. T1 precipitates partly dissolve and δ′ precipitates are found in heat affected zone (HAZ). More T1 precipitates dissolve and S′ precipitates are coarsen in thermo mechanically affected zone (TMAZ). The precipitates absolutely dissolve in nugget zone (NZ).

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