2195鋁鋰合金摩擦攪拌焊接頭組織
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-06-03
采用圓柱形攪拌頭和帶螺紋攪拌頭，制備2195-T8鋁鋰合金摩擦攪拌焊接頭，研究攪拌頭前進速度與旋轉速度對接頭孔洞缺陷的影響，分析接頭的顯微組織特征。
2195鋁鋰合金摩擦攪拌焊接頭組織Structure of friction-stir welding joint of 2195 Al-Li alloy采用圓柱形攪拌頭和帶螺紋攪拌頭，制備2195-T8鋁鋰合金摩擦攪拌焊接頭，研究攪拌頭前進速度與旋轉速度對接頭孔洞缺陷的影響，分析接頭的顯微組織特征。結果表明:當圓柱形攪拌頭旋轉速度與前進速度比值不當時，在接頭前進側下部容易產生貫穿整個接頭的隧道型缺陷(連續(xù)孔洞);采用帶螺紋攪拌頭可以消除接頭的這種缺陷，有效提高接頭抗拉強度。2195-T8鋁鋰合金基材中強化相包括T1相(Al2CuLi)和θ′相(Al2Cu);熱機影響區(qū)所有θ′相及大部分T1相溶解;而焊核區(qū)T1相和θ′相均完全溶解，并在焊核區(qū)產生較多位錯。熱影響區(qū)和基材為沿軋制方向的板條狀晶粒;熱機影響區(qū)晶粒發(fā)生偏轉和變形;焊核區(qū)晶粒均發(fā)生再結晶，但焊核區(qū)邊緣近熱機影響區(qū)再結晶晶粒尺寸較小，而中心焊核區(qū)再結晶晶粒長大。
The friction stir welding (FSW) joints of 2195-T8 Al-Li alloy were prepared by straight cylindrical pin and threaded cylindrical pin. The effect of rotational speed and welding speed on the hole defect was investigated, and the microstructure of the FSW joint was observed. The results show that when the straight cylindrical pin is used at an inappropriate ratio of rotational speed to welding speed, continuous hole (or tunnel) at the bottom of advancing side forms. Meanwhile, this defect can be eliminated by the threaded cylindrical pin, and the joint strength is effectively enhanced. The strengthening precipitates of 2195-T8 Al-Li alloy consist of T1 (Al2CuLi) and θ′(Al2Cu). In thermo-mechanically affected zone (TMAZ), all θ′ precipitates but most T1 precipitates are dissolved. While, all the θ′ and T1 precipitates in nugget zone (NZ) are dissolved, and a lot of dislocations generate. The TMAZ grains under go deflection and deformation during the welding process. The NZ grains are recrystallized, and the recrystallized grains of the NZ close to the TMAZ are larger than those of the NZ center.
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