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fraction of the precipitates increase with the increase of Cu content and the size decreases. The precipitates are solute clusters in the T4 alloy.Key words:Al-Mg-Si-Cu alloy; Cu content; precipitate...Cu含量对Al-Mg-Si-Cu合金微观组织和性能的影响王芝秀1, 2, 3,李 海2, 3,顾建华2, 3,宋仁国2, 3,郑子樵1(1. 中南大学 材料科学与工程学院,长沙 410083; 2. 常州大学 材料科学与工程学院,常州 213164; 3. 常州大学 常州市先进金属重点实验室,常州 213164)摘 要:采用DSC热分析,硬度,电导率,拉伸和晶间腐蚀等测试及透射电镜组织观察......
80 MPa,峰值时效时间则推迟到77 h.J4合金的强度最低,抗拉强度仅有235.1 MPa,屈服强度仅为184.4 MPa,与J3合金的相差120 MPa,一直到196 h都没有明显的峰值时效位置. 图2 不同Cu含量合金的拉伸性能曲线 2.3 均匀化后的SEM组织特征 图3所示为不同Cu含量合金均匀化态的SEM像.从图3中可以看出,不同铜含量合金中的组织形貌差别非常大....从Al-Cu-Sc三元相图[13]也可以得到,在高铜低钪成分范围内,就会有W相形成,在低铜高钪成分范围内,不会存在W相的相区,而是存在Al3Sc相的相区.CHEN等[10]在Al-2.5Cu-0.3Sc合金中没有发现W相,这是由于上述合金体系w(Cu)/w(Sc)仅有8.3,Cu含量较低,Sc含量较高,不会形成W相.所以,在含Sc的Al-Cu合金内,当Cu含量较高时,比较容易形成W相,确切地说......
,符合抛物线关系.可见,富铜相在时效初期迅速析出后长大,但随着时间的增长,其长大速率变缓,呈现出良好的弥散强化的特点. 图4 Super304H 中富铜相在650 ℃长期时效过程中平均直径与时效时间的关系 Fig. 4 Relationship between average diameter of Cu-rich phase in Super304H and aging...识其本质的重要环节,可以为控制和优化这种过程提供实验和理论的依据.针对富Cu相的早期析出行为,由于时效初期颗粒尺寸过于细小,采用先进的三维原子层析技术(3DAP)研究元素在原子尺度的分布情况.图6所示为650 ℃时效1 h后铜原子的分布,3DAP探测区域的大小为11 nm×11 nm×120 nm.由图6可知,仅时效1 h后,Cu原子在奥氏体基体中就已经出现了明显的偏聚而形成1 nm左右的富Cu原......
anneal cannot be sufficiently effective to remove the Cu precipitates in these two regions. Key words: multicrystalline silicon; Cu precipitate; phosphorus gettering; defects; carrier lifetime 1.... The carrier lifetime after Cu contamination was measured by microwave photo-conductance decay (MW-PCD) technique with iodine-methanol solution passivation (0.1 mol/L). Then, the copper precipitate geometries......
Simulation on function mechanism of T1(Al2CuLi) precipitate in localized corrosion of Al-Cu-Li alloys LI Jin-feng(李劲风), ZHENG Zi-qiao(郑子樵), REN Wen-da(任文达) , CHEN Wen-jing(陈文敬), ZHAO Xu-shan(赵旭山... adjacent periphery. Key words: Al-Cu-Li alloy; localized corrosion; mechanism; T1(Al2CuLi) precipitate 1 Introduction Al-Li alloys, compared with traditional Al alloys, possess more excellent......
Influence of Cu addition on microstructure and hardness of near-eutectic Al-Si-xCu-alloys Muzaffer ZEREN, Erdem KARAKULAK, Serap G?M?? The Department of Metallurgical & Materials Engineering, Kocaeli University, Kocaeli 41380, Turkey Received 23 September 2010; accepted 10 January 2011 Abstract: The influence of Cu content on the microstructure and hardness of near-eutectic Al-Si-xCu (x......
Trans. Nonferrous Met. Soc. China 22(2012) 1860-1865 Precipitation behaviour of Al3Zr precipitate in Al-Cu-Zr and Al-Cu-Zr-Ti-V alloys JIA Zhi-hong1,2, Jean-Philippe COUZINI?3, Nadia CHERDOUDI3... SA, 60181 Nogent sur Oise Cedex, France Received 10 November 2011; accepted 20 June 2012 Abstract: The precipitation behaviours of Al3Zr precipitate in the Al-Cu-Zr and Al-Cu-Zr-Ti-V alloys were......
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可达98%左右,Cu直收率为97.60%,杂质元素Pb,Sb,Sn和As含量分别降至0.005 8%,1.02%,0.002 3%和0.039%,脱除率分别为99.96%,95.17%,99.94%和99.84%,除杂效果明显好于直接真空蒸馏.残余物经吹炼可得能够适用于电解的阳极铜.关键词:真空蒸馏;硫化;铜砷锑多元合金;回收CuRecovering Cu from Cu-As-Sb multi...采用硫化-真空蒸馏法从铜砷锑多元合金中回收铜杨先凯1, 2, 3,杨斌1, 3,熊恒1, 3, 4,徐宝强1, 2, 3,戴永年1, 2, 3,刘大春1, 2(1. 昆明理工大学 真空冶金国家工程实验室,云南 昆明,650093; 2. 昆明理工大学 云南省有色金属真空冶金重点实验室,云南 昆明,650093; 3. 昆明理工大学 冶金与能源工程学院,云南 昆明,650093; 4. 昆明......