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reports indicated that [6-11] the precipitates show a directional distribution under the applied stress in the aging process of some aluminum alloys (such as Al-Cu alloy, Al-Cu-Mg alloy). It can be called as ‘precipitation orientation effect’. Because this effect causes the degraded material property of aluminum alloy [6,7], the application of the CAF technology has been limited in Al-Cu(-Mg......
thicknesses of theta’ precipitates in Sn-microalloyed Al-Cu [J]. Acta Materialia, 2011, 60(2): 633-644. [8] RINGER S P, SAKURAI T, POLMEAR I J. Origins of hardening in aged Al-Cu-Mg-(Ag) alloys [J]. Acta Materialia, 1997, 45(9): 3731-3744. [9] CHEN Z G, ZHENG Z Q. Microstructural evolution and ageing behaviour of the low Cu-Mg ratio Al-Cu-Mg alloys containing scandium and lithium [J]. Scripta......
Effect of Al addition on formation and mechanical properties of Mg-Cu-Gd bulk metallic glass GENG Jia-yuan(耿家源), SUN Yu-feng(孙玉峰), WANG Li-guo(王利国), ZHU Shi-jie(朱世杰), LIU Li-zhao(刘利召), GUAN Shao... with the corresponding crystalline alloys [1-3]. Mg-TM-RE (TM=Cu, Ni, Zn, Ag, Pd and RE stands for rare-earth metal such as Y) alloy systems were reported to exhibit a good glass forming ability(GFA) and high......
Zn和Mg的Al-Cu-Li系合金,目前国外发表的有关2099合金的研究文章主要集中在对合金力学性能及疲劳裂纹扩展和断裂韧性方面的研究,而关于该合金中Mg和Zn元素对其组织与性能影响和作用机理的研究未见公开详细报道,而目前国内也尚未有关于这方面的研究,因此,本研究主要从热处理制度和微观组织出发,探讨2099合金组织与性能的关系以及Mg和Zn元素的合金化作用,这 对今后该合金的发展应用具有...+δ′相+(θ′相)→T1相,强化相有δ′,θ′和T1相,合金的时效强化效果来源于这几种析出相的综合强化. 在Al-Cu-Li合金中添加Mg元素,由于Mg原子与空位以及Cu原子之间有很强的交互作用,固溶淬火后容易形成许多Cu-Mg-空位组成的团簇和Cu-Mg原子对[5],在淬火之后时效早期,这些复合团簇和原子对形成溶质偏聚区,这种成分上的起伏将成为富Cu的GP区的形核位置[6],并促使Cu原子不断......
文章编号:1004-0609(2013)07-1833-10 Mg,Ag,Zn多元微合金化对新型Al-Cu-Li合金时效行为的影响 罗先甫,郑子樵,钟继发,张海锋,钟 警,李世晨,李劲风 (中南大学 材料科学与工程学院,长沙 410083) 摘 要:通过常规拉伸性能测试,扫描电镜(SEM)和透射电镜(TEM)观察,研究少量Mg,Ag,Zn多元微合金化对一种新型Al-Cu....Mg元素微合金化的强化效果最强,同时添加Ag和Zn或单独添加Ag或Zn均能增强其强化效果；无Mg存在条件下,添加Ag,Zn对合金的强化效果较小.在T8时效态下,时效前的预变形形成的大量位错成为T1相的形核点,使合金形成细小,密集和均匀弥散分布的T1相,削弱了Mg,Ag,Zn元素对合金时效析出过程的影响. 关键词:Mg；Ag；Zn；Al-Cu-Li合金；拉伸性能；微观组织 中图分类号......
铝合金在蠕变时效过程中材料内部的应力状态与微观组织都在不断变化,且二者相互影响.为此,领域内的研究者们采用多种调控方式以获得不同铝合金的形性同步,如STARINK等[3]研究了铝合金成分改变对于下机翼壁板等耐损伤构件时效成形的适用性；JESHVAGHANI等[4]将多级热处理制度引入铝合金蠕变时效成形中,成形试样的回弹与剥落腐蚀敏感性下降而强度未减；LIN等[5]报道了Al-Cu-Mg合金的双级蠕变时效工艺可使无沉淀区宽化,在晶界处形成不连续析出相,从而提高抗腐蚀性能. 大部分高强可时效强化铝合金经应力时效后,晶内致密析出且晶界相粗大不连续,与传统的冷加工相比具有更好的强度和抗腐蚀性能[6-8].然而,作为一种航空工业中常用的可时效强化型轻质高强结构材料,2×××系铝合金的蠕变时效成形却并没有像7×××系铝合金那样在工业制造中得到大量应用.其中一个最重要的原因在于Al-Cu-Mg合金时效析......
in the high-speed railway of China which have a tensile strength of 522 MPa and an electrical conductivity of 68.6% IACS [4]. Previous report showed that the addition of Mg into Cu remarkably increased... alloys [12] etc. Deformation at cryogenic temperature can suppress dislocation activity and favor the presence of deformation twins. Furthermore, the addition of Mg into Cu significantly reduces......
Jing-hua, CHEN Jian-qing, et al. Effect of surface nanocrystallization on electrochemical corrosion behaviours of Cu-Mg alloy[J]. The Chinese Journal of Nonferrous Metals, 2017, 27(3): 477-485. [3] 贺玉...验 实验材料为厚度为5 mm 的AZ31镁合金挤压板材,其成分为(质量分数,%):Al,2.95；Zn,0.86；Mn,0.33；余量为Mg.其室温抗拉强度为275 MPa,屈服强度为183.5 MPa,断后伸长率为22.7%. 疲劳实验设备为SDS-100电液伺服疲劳试验机并配备腐蚀箱,疲劳加载频率f为10 Hz,应力比r为0.1.实验环境为3.5% NaCl溶液(模拟海洋环境),与空气(相对湿......
-Zr-Mg-Si alloy during thermomechanical treatments[J]. Materials & Design, 2012, 39: 404-409. [5] ZHANG Y, VOLINSKY A A, TRAN H T, et al. Aging behavior and precipitates analysis of the Cu-Cr-Zr...: 107-115. [9] 李华清, 谢水生, 吴鹏越, 等. Cu-Cr-Zr-Mg合金真空铸造工艺研究[J]. 特种铸造及有色金属, 2006, 26(7): 387-399. LI Hua-qing, XIE Shui-sheng, WU Peng-yue, et al. Vacuum smelting casting process for Cu-Cr-Zr-Mg alloy[J......
The chemical composition of the inert gas atomizing powders of 2024Al alloy consists of 3.53% Cu, 1.28% Mg, 0.2% Fe, 0.04% Si and balance aluminum (mass fraction). The SEM images of the 2024Al powders... with the previous reports [22-25]. The extremely rapid initial hardening reaction is attributed to the formation of Cu-Mg co-clusters. As shown in Figs. 5(a)-(f), the time for peak aging decreases......
