稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2011年
2期
201-205
,共5页
彭勇宜%尹志民%雷学锋%潘清林%何振波
彭勇宜%尹誌民%雷學鋒%潘清林%何振波
팽용의%윤지민%뢰학봉%반청림%하진파
铝镁钪合金%搅拌摩擦焊%组织与性能%亚结构强化%Al3(Sc,Zr)
鋁鎂鈧閤金%攪拌摩抆銲%組織與性能%亞結構彊化%Al3(Sc,Zr)
려미항합금%교반마찰한%조직여성능%아결구강화%Al3(Sc,Zr)
Al-Mg-Sc%friction stir welding%microstrueture and properties%substructure strengthening%Al3(Sc,Zr)
采用搅拌摩擦焊对铝镁钪合金热轧板和冷轧.退火板进行焊接.测定焊接接头的硬度分布和拉伸力学性能,采用金相和透射电子显微技术分析焊缝区显微组织特征和力学性能的关系.结果表明,热轧板和冷轧.退火板搅拌摩擦焊焊接系数高达92%;焊接接头上焊核区硬度最低、拉伸断口位于焊核区;焊核区在热循环作用下发生部分再结晶导致的亚结构强化的减弱以及.Al3(Sc,Zr)粒子共格强化作用的消失是搅拌摩擦焊焊核区强度下降的主要原因.
採用攪拌摩抆銲對鋁鎂鈧閤金熱軋闆和冷軋.退火闆進行銲接.測定銲接接頭的硬度分佈和拉伸力學性能,採用金相和透射電子顯微技術分析銲縫區顯微組織特徵和力學性能的關繫.結果錶明,熱軋闆和冷軋.退火闆攪拌摩抆銲銲接繫數高達92%;銲接接頭上銲覈區硬度最低、拉伸斷口位于銲覈區;銲覈區在熱循環作用下髮生部分再結晶導緻的亞結構彊化的減弱以及.Al3(Sc,Zr)粒子共格彊化作用的消失是攪拌摩抆銲銲覈區彊度下降的主要原因.
채용교반마찰한대려미항합금열알판화랭알.퇴화판진행한접.측정한접접두적경도분포화랍신역학성능,채용금상화투사전자현미기술분석한봉구현미조직특정화역학성능적관계.결과표명,열알판화랭알.퇴화판교반마찰한한접계수고체92%;한접접두상한핵구경도최저、랍신단구위우한핵구;한핵구재열순배작용하발생부분재결정도치적아결구강화적감약이급.Al3(Sc,Zr)입자공격강화작용적소실시교반마찰한한핵구강도하강적주요원인.
The hot rolled and cold rolled-annealed plates of AI-Mg-Sc alloys were welded by friction stir welding. The hardness dis-tribution and the tensile properties of welded joints were measured; the relationships between the microstrueture and the properties of the welded joints were studied by means of optical microscopy and transmission electron microscopy. The results show that the welding coefficients of two plates are as high as 92%, the hardness and strength of their weld nugget zones are the lowest, and the fracture of their welded joints happens at weld nugget zones during tensile testing. The decrease of the substructure strengthening caused by the partial recrystallizatinn and the loss of precipitation strengthening from Al3(Sc,Zr)particles result in the decline of hardness and strength of Al-Mg-Sc alloy welded joints.