6016T4铝合金回溶状态下的高温变形行为  

High⁃temperature deformation behavior of 6016T4 aluminum alloy under reversion ageing state

作　　者：付璐琪 何俊 刘萌 高文 曹以恒 刘春辉 FU Luqi;HE Jun;LIU Meng;GAO Wen;CAO Yiheng;LIU Chunhui(Light Alloy Research Institute,Central South University,Changsha 410083,China;Chongqing National Innovation Institute of Light Alloys Co.,Ltd.,Chongqing 400039,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]重庆国创轻合金研究院有限公司,重庆400039

出　　处：《轻合金加工技术》2024年第9期26-31,共6页Light Alloy Fabrication Technology

基　　金：中铝高端制造重点研发项目(zlgd-zdyf-2022-12)。

摘　　要：6016铝合金具有较强的室温停放效应,严重影响其成形能力。自然时效达到稳定状态的6016铝合金屈服强度为146 MPa,比固溶态的强度增加了57%。通过提高变形温度可以显著降低合金强度,实现成形性能的提高。采用Gleeble热模拟试验机拉伸测试6016T4铝合金在回溶状态下的高温应力应变曲线,260℃下合金的屈服强度仅有78 MPa,接近室温淬火态合金的强度。然而,由于水冷夹具导致的温度梯度使试样变形过程中产生非均匀应变场。使用15 mm的有效标距长度可以获得更加精确的力学性能,为未来热-机械测试新标准的制定提供了试验数据。6016 aluminum alloy has a significant natural ageing effect at room tempera-ture,which seriously affects sheet formability.The yield strength of 6016 aluminum alloy in the stable state after natural ageing is 146 MPa,which is a 57%increase over the strength of the alloy in the water-quenched(W)temper.Increasing deformation temperature can significantly reduce strength and improve formability.The high-temperature deformation be-havior in reversion ageing state was investigated with a Gleeble thermo-mechanical simulator system.Yield strength at 260℃isonly 78MPa,closeto thatof6016W aluminumalloy at room temperature.However,the temperature gradient due to the water-cooled grips results in a heterogeneous strain field during the deformation process.More accurate mechanical properties can be obtained with a effective gauge length of 15 mm.The study provides exper-imental data for the development of new standards for thermo-mechanical tests in the future.

关 键 词：6016T4铝合金 自然时效 高温变形 温度梯度 

分 类 号：TG146.21[一般工业技术—材料科学与工程]