摘要
国内对航天用2A14铝合金在中-低温循环条件下力学及疲劳性能的变化规律研究不足,为掌握该材料在上述工况下的力学表现及疲劳损伤情况,对2A14铝合金开展了室温—低温(-196℃×4 h)—室温,室温—中温(150℃/180℃×0.5 h)—室温两种工况循环条件下的力学、疲劳性能及组织变化规律研究。结果表明,在上述两种工况下循环5次,2A14铝合金的晶粒尺寸、粗大相形貌及分布均无显著变化,仍保持高强度及良好的塑韧性;随着应力幅值的降低,2A14铝合金的疲劳寿命逐渐延长;应力比为-1时,2A14铝合金的疲劳极限为150~175 MPa,上述两种工况下循环5次,不会改变2A14铝合金的韧性断裂机制。
The research on the changes in mechanical and fatigue properties of 2A14 aluminum alloy used in aerospace under middle-cryogenic temperature cycling conditions in China is still insufficient.In order to understand the mechanical behavior and fatigue damage of the material under the above working conditions,the mechanical,fatigue properties and microstructure changes of 2A14 aluminum alloy under the two working conditions of room temperature-low temperature(-196℃×4 h)-room temperature and room temperature-medium temperature(150℃/180℃×0.5 h)-room temperature were studied.The results show that the grain size,coarse phase morphology and distribution of 2A14 aluminum alloy are not significantly changed under the above two working conditions for 5 cycles,and high strength and good plasticity toughness are still maintained.With the decrease of stress amplitude,the fatigue life of 2A14 aluminum alloy is gradually extended.When the stress ratio is-1,the fatigue limit of 2A14 aluminum alloy is 150-175 MPa,and the ductile fracture mechanism of 2A14 aluminum alloy is not changed under the above two working conditions for 5 cycles.
作者
马存强
曹海龙
徐方涛
李刘合
田宇兴
刘成
MA Cunqiang;CAO Hailong;XU Fangtao;LI Liuhe;TIAN Yuxing;LIU Cheng(Landspace Technology Co.,Ltd.,Beijing 100176;College of Mechanical Engineering and Automation,Beihang University,Beijing,100191;Chinalco Materials Application Research Institute Co.,Ltd.,Beijing 102209)
出处
《有色金属材料与工程》
CAS
2023年第3期49-55,共7页
Nonferrous Metal Materials and Engineering
基金
蓝箭航天创新基金资助项目(1221JS018)。
关键词
2A14铝合金
不同温度循环
力学性能
疲劳性能
2A14 aluminum alloy
different temperatures cycling
mechanical properties
fatigue properties
作者简介
第一作者:马存强(1986—),男,高级工程师。研究方向:航空航天金属材料。E-mail:macunqiang@landspace.com。
