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dual aging, and retrogression and reaging(RRA), were carried out in this work and they are detailed in Table 2. After heat treatment, the tension and impact specimens were prepared from both... Effects of heat treatment process on stress corrosion cracking and microstructures of 7A05 Al alloy plate CAI Gang-yi(蔡刚毅), L? Guang-shu(吕广庶), MA Zhuang(马 壮) School of Materials Science......
retrogression and re-ageing (RRA) heat treatment exhibits higher tensile strength, ductility and conductivity. Key words: Al-Zn-Mg-Cu alloy; Er; heat treatment; microstructures; mechanical properties... [3-4]. Retrogression and re-ageing (RRA) heat treatment can enhance the SCC resistance, while retaining the T6 strength of 7075 alloy [5-6], which is a popular heat treatment for Al-Zn-Mg- Cu alloys......
September 2005; accepted 6 January 2006 Abstract: The effect of retrogression and re-aging(RRA) heat treatment on the microstructure and mechanical properties of a low frequency electromagnetic casting... regime is not the optimum regime to the RRA treatment of the high-zinc content super-high strength aluminum alloy. Key words: Al-Zn-Mg-Cu alloy; retrogression; re-aging; microstructure; mechanical......
7050合金RRA沉淀析出的TEM研究 张永刚1,李永霞1,陈昌麒1,黄正1,谷亦杰1 (1.北京航空航天大学材料科学与工程系,北京,100083) 摘要:采用透射电镜(TEM)和维氏硬度计研究了回归再时效 (RRA)处理对7050合金的的影响.研究发现,7050合金受回归温度和时间影响.当回归温度为453K和473K时,回归曲线由三部分组成,回归再时效曲线由两部分组成.与在回归曲线上存在的峰值硬度相比,回归再时效峰值硬度要高.TEM观察表明,硬度谷值的产生与GP 区的回溶有关,而峰值的产生与η′和η相的沉淀析出有关.回归再时效峰值高于回归峰值,这与回归再时效过程中η和η′相沉淀析出数目增加有关.当回归温度为493K, 回归和回归再时效曲线单调下降,分析认为由于回归温度高,回归曲线上不能区分GP区的回溶,η和η′相形核,η和η′相长大及粗化这三个阶段. 关键词:7050合金; 回......
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Vacuum Furnace - Integrated "Sub zero" Treatment B.Zieger1,Hubert Schulte1 (1.SCHMETZ GmbH, Menden, Germany) 摘要:The vacuum heat treatment with overpressure gas quenching is more and more accepted... chamber and "sub zero" systems lead towards an oxidation free and low distortion vacuum heat treatment for a broad range of parts and materials. Short and energy saving processes guarantee a high......
超高强铝合金RRA热处理工艺的研究进展 宁爱林1,刘志义1,冯春1,曾苏民1 (1.中南大学材料科学与工程学院,长沙,410083;2.西南铝业(集团) 摘要:7000系超高强铝合金是航空航天工业的主要结构材料之一,T6(峰时效)状态下该系合金强度最高但对应力腐蚀(SCC)十分敏感,RRA(回归再时效)工艺兼顾了合金的强度和抗应力腐蚀性能,适应目前航空航天工业对结构材料的要求.综述了过去30年超高强铝合金RRA热处理工艺的发展和最新研究动态,并较全面地介绍了RRA热处理对超高强铝合金组织与性能的影响. 关键词:Al-Zn-Mg-Cu合金; 回归再时效; 力学性能; 抗应力腐蚀性能; 热处理; [全文内容正在添加中] ......
7050铝合金回归再时效工艺(RRA)研究罗杰,吕正风,张华,孟凡林南山铝业股份有限公司摘 要:通过对传统RRA处理路线的改进,采用正交试验法得到了27mm厚的7050铝合金可工业化生产的RRA处理的热处理制度,即:预时效120℃/24h+20min内从120℃加热至190℃并保温60min后强制水冷到室温+再时效120℃/24h.这种制度经重复性验证及TEM分析,其晶内保持类似于T6状态的显微组织结构,为细小弥散的η’相和极少量的η相.同时,晶界析出物的大小和分布特征与T74状态的类似,这样既保证了T6状态的强度又具有T74状态的抗蚀性能.关键词:7050铝合金;回归再时效;RRA;显微组织;......
The Modern Applications of Surface Duplex Treatment Technology Adam Mazurkiewicz1,Jerzy Smolik1,Jerzy Tomaszewski2,Jan Walkowicz1 (1.Institute for Terotechnology, Pulaskiego 6/10, Radom 26-600... treatment technology for creation of biocompatible diamond-like a-C:H films.The paper presents research results concerning influence of the process parameters of the a-C:H coatings creation by means......
时效和RRA处理对国产7050铝合金性能的影响宫波,赖祖涵东北工学院物理系摘 要:研究了时效热处理和RRA热处理对国产7050铝合金强度,韧性及抗应力腐蚀性能的影响.结果表明:合金经 140℃,24h 处理,强度和抗应力腐蚀性能优于传统的 T6处理;RRA 处理可使合金强度达到峰值,而抗应力腐蚀性能达到双级时效水平.分析了断裂韧性的影响因素,指出国产7050铝合金具有良好断裂韧性的原因是Fe,Si 杂质含量少,Mg,Cu 含量偏低.关键词:7050铝合金;RRA;断裂韧性;......
