摘要
随着铝锂(Al-Li)合金在航空航天领域的应用愈发广泛,对其各向异性研究有助于Al-Li合金的进一步开发利用。采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、电子背散射衍射(EBSD)等对T3态2050 Al-Li合金板材进行显微观察,通过拉伸实验对合金板材轧制方向、垂直轧制方向、厚度方向的拉伸力学性能三维各向异性进行研究。结果表明:T3态2050 Al-Li合金轧制板材轧向中间层强度最高,屈服强度为370 MPa,抗拉强度为465 MPa,而伸长率最小,为9.6%;合金板材横向表面层强度最低,屈服强度为325 MPa,抗拉强度为431 MPa,伸长率最高为19.2%。合金板材不同厚度层断口形貌、晶粒大小不同;2050 Al-Li合金板材不同厚度层各向异性程度不同:0T(表面层)、0.25T(中间层)屈服强度和抗拉强度各向异性强,伸长率各向异性弱;而0.5T(中心层)屈服强度和抗拉强度各向异性弱,伸长率各向异性强。2050 Al-Li合金板材不同厚度层各向异性主要由晶粒取向、织构引起,0T和0.5T厚度层最强织构类型均为{011}〈211〉黄铜织构。
With the increasing application of Al-Li alloy in the aerospace field,the study of its anisotropy is conducive to the further development and utilization of Al-Li alloy.Scanning electron microscope,transmission electron microscope,X-ray diffractometer and electron back-scattered diffraction were used to observe the microstructure of 2050 Al-Li alloy with T3 status.The three-dimensional anisotropy of tensile mechanical properties of alloy plates was studied by tensile test.The results show that the strength of the rolling middle layer of 2050 Al-Li alloy plate with T3 status is the highest,the yield strength is 370 MPa,The tensile strength is 465 MPa,the elongation is the lowest at 9.6%.The transverse surface strength of alloy plate is the lowest,the yield strength is 325 MPa,the tensile strength is 431 MPa,and the elongation is the highest at 19.2%.The fracture morphology and grain size in different thickness of alloy plate are different.The grains in the surface region are thin and compact with small size,while the grains in the middle region are wide and flat with large size.The anisotropy of different thickness of 2050 Al-Li alloy plate is different:the anisotropy of yield strength and tensile strength in surface and middle region is strong,and the anisotropy of elongation is low,while the anisotropy of yield strength and tensile strength in central region is low,the anisotropy of elongation is strong.The anisotropy of different thickness of 2050 Al-Li alloy rolled plate is mainly formed by the grain orientation and texture.The strongest texture type of surface area and central area is{011}〈211〉brass texture.
作者
胡锦龙
邱义
钱锋
韩启飞
闫杨予
王俊升
郭跃岭
Jinlong HU;Yi QIU;Feng QIAN;Qifei HAN;Yangyu YAN;Junsheng WANG;Yueling GUO(School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2023年第9期97-106,共10页
Journal of Materials Engineering
基金
国家自然科学基金(52105319)。
