彭皓云,谢洪志,白雪山,张帅,尹延广,赵天章.热处理状态对2198铝锂合金板材各向异性力学行为的影响[J].稀有金属材料与工程,2021,50(4):1398~1404.[PENG Haoyun,XIE Hongzhi,BAI Xueshan,ZHANG Shuai,YIN Yanguang,ZHAO Tianzhang.Influence of Heat Treatment on the Anisotropic Mechanical Behavior of 2198 Al-Li Alloy Sheet[J].Rare Metal Materials and Engineering,2021,50(4):1398~1404.]
热处理状态对2198铝锂合金板材各向异性力学行为的影响
投稿时间:2020-06-03  修订日期:2020-07-15
中文关键词:  铝锂合金  热处理  各向异性  力学性能  微观组织
基金项目:国家自然科学基金(51605310)和中国博士后科学基金(2019M661123)
中文摘要:
      应用铝锂合金板材生产蒙皮等大型薄壁结构零件是航空制造轻量化的重要途径,本文利用单向拉伸系统测试了不同热处理状态下2198铝锂合金板材沿着轧向(RD)、45°和横向(TD)方向的力学行为,研究了热处理对其各向异性的影响,并从晶体学织构、时效相和断口形貌分析了微观机制。结果发现,新淬火和自然时效状态的2198铝锂合金板材具有相似的各向异性,RD方向具有最高的强度、最高的硬化率和最低的延伸率,45°方向则具有最低的强度、最低的硬化率和最高的延伸率,主要原因是轧制板材存在强烈的<112>{110}织构。但是,经人工时效后的2198铝锂合金板材的各向异性因不均匀析出的T1相而发生了明显的变化,45°方向上的强度得到了较大程度的提升,具有和TD方向相同的水平,硬化率发生了明显的降低,TD方向成为硬化率最大的方向,而延伸率和断口形状的各向异性并未变化,可见T1相导致2198铝锂合金板材发生了各向异性的强化,却对断裂行为的各向异性影响较小。本文的研究旨在明确热处理对2198铝锂合金板材各向异性力学行为的影响,为开发其塑性成形工艺提供理论依据,有助于提出2198铝锂合金板材强韧化的新思路。
Influence of Heat Treatment on the Anisotropic Mechanical Behavior of 2198 Al-Li Alloy Sheet
英文关键词:Al-Li alloy  heat treatment  anisotropy  mechanical properties  microstructure
英文摘要:
      The application of Al-Li alloy sheet with high specific strength and low fatigue crack growth rate for large thin-walled structural parts such as skin is an important way to reduce the weight of aeroplane. The mechanical behaviors of 2198 Al-Li alloy sheet along the rolling direction (RD), 45° and transverse direction (TD) were tested using unidirectional tension. The effect of heat treatment on its anisotropy was studied. The crystallographic texture, aging precipitate and fracture morphology were analyzed for the micro mechanism. It was found that the new-quenched and naturally aged 2198 Al-Li alloy sheet has similar anisotropy. RD has the highest strength, the highest hardening rate and the lowest elongation. 45° direction has the lowest strength and the lowest hardening rate and the highest elongation. The main reason is the strong <112> {110} texture in the rolled sheet. However, the anisotropy of the 2198 Al-Li alloy sheet after artificial aging has changed significantly due to the inhomogeneous precipitation of the T1 phase. The strength in 45° direction has been greatly improved to the level same as TD. And the hardening rate was significantly reduced. TD becomes the direction with the largest hardening rate. The anisotropy of elongation and fracture shape did not change. It can be seen that the T1 phase caused the anisotropic strengthening of the 2198 Al-Li alloy sheet but it has little effect on the anisotropy of fracture behavior. The purpose of this study is to clarify the effect of heat treatment on the anisotropic mechanical behaviors of 2198 Al-Li alloy sheet, to provide a theoretical basis for the development of its plastic forming process and to help to propose new ideas for strengthening and toughening of 2198 Al-Li alloy sheet.
作者单位E-mail
彭皓云 沈阳飞机工业集团有限公司 137411635@qq.com 
谢洪志 沈阳飞机工业集团有限公司  
白雪山 沈阳飞机工业集团有限公司  
张帅 沈阳飞机工业集团有限公司  
尹延广 沈阳航空航天大学  
赵天章 沈阳飞机工业集团有限公司 tzzhao@alum.imr.ac.cn 
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