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文献标志码:A 7075铝合金是Al-Zn-Mg-Cu系可热处理强化铝合金,由于其密度低,强度高,热加工性能和耐腐蚀性能好等优点,使得7075铝合金在航空航天,车辆,建筑桥梁等领域应用广泛[1-3].但该系列铝合金存在硬度低,常温塑性差[4]等不足,研究表明,剧烈塑性变形法(Severe plastic deformation, SPD)可细化晶粒,提...,尺寸变小,弥散分布.图5(c)所示为RFE/T6态的7075铝合金BSE像,可见,经固溶时效处理后的第二相比RFE态更细小,分布较均匀.对图5(a)~(c)中的白色第二相进行EDS点扫描分析,表2所列为图5中点1~3位置的EDS点扫描结果.由表2可知,基材中的第二相成分为Al,Cu和Fe元素,结合文献[13-15]分析认为这种第二相主要是FeAl和AlCu初生金属间化合物,它们是铸锭在凝固过程中形......
evolution of 7075 Al alloy during hot deformation. The results show that the stress-strain curves under the experimental conditions belong to the type of dynamic recovery. The microstructure undergoes... size of the deformed material increases. Key words: 7075 Al alloy; microstructure evolution; dynamic recovery; hot deformation ......
. Key words: Al 7075 alloy; Mg AZ31 alloy; diffusion bonding; intermetallic compounds; interfacial transition zone; microstructure; mechanical properties 1 Introduction Aluminum and its alloys are widely... occurred between Al3Mg2 and Al12Mg17 layers. Figure 11(b) shows SEM images of fracture surface of the Al 7075 alloy. In this case, the river pattern is observable, which suggests also a brittle fracture......
control the grain growth evidently during reheating under the same condition. The average grain size of 4.4%TiCp/7075 Al matrix composites is 30?40 μm less than that of 7075 alloy, therefore it is more suitable for thixoforming. Key words: 7075 Al alloy; in-situ TiC particle; reheating; casting ......
如表1所列. 表1 7075铝合金的化学成分 Table 1 Chemical composition of 7075 aluminum alloy (mass fraction, %) 在检测连续冷却条件下的半固态7075铝合金流变性能时,采用自行设计的Couette型同轴双筒黏度计,其结构原理如图1所示. 图1 黏度计示意图 Fig. 1 ... between solid fraction of 7075 aluminum alloy and temperature 连续冷却条件下的半固态7075铝合金流变性能的检测过程如图3所示.首先将7075铝合金加热熔化至700 ℃,保温30 min,然后分别以4,2及1 ℃/min的冷却速率将7075铝合金熔体冷却；当7075铝合金熔体冷却至液相线以上某一温度时,以一定的剪切速率对其施加搅拌,同时运行采......
: continuous casting and rolling; 7075 Al alloy; roll speed difference; microstructure; mechanical properties; texture; anisotropy 1 Introduction Having high strength and good corrosion resistance, 7000 series...) operation on the mechanical properties of finally rolled 7075 Al alloy. The present research work was concerned with simultaneous continuous casting and rolling process of this alloy. With this regard......
temperature, the equivalent size of the primary α(Al) grains decreased and the shape factor increased with the increase of the number of turns. During the slurry preparation of semi-solid 7075 aluminum alloy... and near-spherical grains. Key words: 7075 aluminum alloy; semi-solid slurry; serpentine channel; primary α(Al) 1 Introduction Semi-solid metal (SSM) processing was developed by FLEMINGS et al [1......
of the rheoforming with 7075 alloy to improve the competitiveness of this emerging technology in the manufacture of wrought aluminum alloy. High quality semi-solid slurry was produced, in which primary α(Al...: 7075 Al alloy; rheoforming; semi-solid processing ......
, Ministry of Education, Northeastern University,Shenyang 110004, China) Abstract:In this study, reheating of liquidus semi-continuous east billets of 7075 Al alloy wascarried out in a resistance furnace... for thixoforming. Key words:reheating; 7075 Al alloy; liquidus casting; microstructure; [全文内容正在添加中] ......
rotation speed 图4 除气前后7075铝合金密度和密度指数的比较 Fig. 4 Comparison of densities and density index of 7075 alloy with and without degassing 图5 除气前7075铝合金试样的纵截面和对应的显微组织 Fig. 5 Sectioned...对应的显微组织 Fig. 6 Sectioned samples and corresponding microstructures of 7075 alloy after degassing 图7 7075铝合金密度和密度指数随着延长除气时间的变化 Fig. 7 Variation of densities and density index of 7075......
