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of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China) Abstract: The influence of retrogression and re-aging treatment (RRA...;Aging treatment conditions of 1973 aluminum alloy 2.2 晶间腐蚀 图1所示为不同时效处理后1973铝合金在晶间腐蚀液中浸蚀6 h后的纵截面晶间腐蚀金相组织形 貌.可以看出:T6处理后合金的晶间腐蚀最大深度为176 μm,如图(a)所示;经RRA 180 ℃,20 min;RRA 180 ℃,40 min和......
Microstructure and RRA Treatment of LFEC 7075 Aluminum Alloy Extruded Bars王高松,ZHAO Zhihao,CUI Jianzhong,GUO QiangKey Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University摘 要:The microstructures after casting and extruding, the mechanical properties and electrical conductivity after RRA treatment......
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. Key words: 7050 aluminum alloy; retrogression and re-aging (RRA) treatment; retrogression cooling rate; mechanical properties; intergranular corrosion 1974年,CINA[1]发明了一种回归再时效(Retrogression and re-aging... typical RRA processes 2.4.2 再时效态合金的微观组织 3种典型再时效态合金的微观组织如图5所示. 图4 不同回归冷却速率下3种典型回归态合金的TEM像 Fig. 4 TEM images of alloys after retrogression treatment at different retrogression cooling......
7000系高强铝合金的RRA处理莫志民,郑子樵,黄碧萍摘 要:介绍一种可提高7000系高强铝合金强度及抗应力腐蚀性能的最新热处理工艺--三级时效(RRA)热处理.包括其工艺流程,适用条件及相关机理等方面.并从理论上分析应用中出现的一些问题.关键词:7000系铝合金;三级时效热处理(RRA处理);应力腐蚀;......
740-750 MPa after the RRA heat treatment of 120 ℃×4 h pre-ageing+retrogressed for 30 min+120 ℃×24 h re-ageing. The intracrystalline microstructure is similar to that of T6 temper and the grain boundary... ageing at a higher temperature of 130 ℃, the alloy after RRA treatment can obtain high tensile strength above 700 MPa, but the plasticity of the alloy decreases significantly due to the effect of small......
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aluminum alloys in the T6 temper are known to be highly susceptible to stress corrosion cracking (SCC). Retrogression and re-aging (RRA) is a heat treatment by which the resistance to SCC is enhanced... of the Al matrix [2-4]. Experimental results by CINA and GAN [5] indicated that retrogression and re-aging (RRA), a multi-stage heat treatment, is a trade-off between strength in T6 temper and corrosion......
alloy [J]. Transactions of Nonferrous Metals Society of China, 2006, 16(5): 1163-1170. [10] PENG Guo-sheng, CHEN Kang-hua, CHEN Song-yi, FANG Hua-chan. Influence of repetitious-RRA treatment... with different dual-retrogression time: (a) 5 min; (b) 30 min; (c) 60 min The influences of dual-retrogression time on dual- RRA hardness and conductivity are summarized in Fig. 3. The hardness values......