ZLD102合金熔炼工艺的改进

ＺＬＤ１０２合金熔炼工艺的改进ＺＬＤ１０２合金主要成分为１０．０～１３．０％Ｓｉ，余为Ａｌ。熔炼ＺＬＤ１０２合金之类Ａｌ－Ｓｉ合金的常规工艺是，先将纯Ｓｉ破碎成２０～５０ｍｍ的纯Ｓｉ块，在高温下加入铝熔体中，制成Ａｌ－Ｓｉ中间合金锭；用Ａｌ－Ｓｉ中间...     

铸造Al-Si合金熔体处理——晶粒细化

对亚共晶Ａｌ－Ｓｉ铸造合金进行细化处理已成为一种基本操作。中间合金（Ａｌ－Ｔｉ,Ａｌ－Ｔｉ－Ｂ和Ａｌ－Ｂ合金）在亚共晶Ａｌ－Ｓｉ铸造合金中与在工业纯铝和变形铝合金中的晶粒细化行为存在较大的差异。Ａｌ－３Ｔｉ－３Ｂ,Ａｌ－３Ｂ中间合金在Ａｌ－Ｓｉ铸造合金中表现出优异的晶粒细化效应,Ｓｉ与晶粒细化剂的交互作用在其中扮演着重要的角色。通过炉前对熔体进行快速热分析可以对晶粒细化效果和变质程度进行评价和预测,继而控制熔体处理的质量。对于亚共晶Ａｌ－Ｓｉ铸造合金,归纳起来有四种晶粒细化机理：包晶反应理论、共晶反应理论、硼化物颗粒理论和超形核理论。仅对Ａｌ－Ｓｉ铸造合金细化处理的最新进展、Ｓｉ与晶粒细化剂的交互作用和晶粒细化机理进行综合评述     

Al—12%Si合金α—Al晶粒细化剂的研究

研究了Ａｌ－５Ｔｉ－１Ｂ和Ａｌ－３Ｂ中间合金对铸造铝合金Ａｌ－１２％Ｓｉ的α－Ａｌ晶粒的细化效果。结果表明，Ａｌ－３Ｂ中间合金的细化能力和抗延时衰减性能皆优于Ａｌ－５Ｔｉ－１Ｂ中间合金。分析认为，ＡｌＢ２和ＴｉＢ２相质点均为铸造Ａｌ－Ｓｉ合金中α－Ａｌ潜在的结晶核心，而Ａｌ３Ｔｉ相易被Ｓｉ原子毒化，失去作为结晶核心的作用。     

第三组元对Al-Bi偏晶合金凝固组织的影响

采用控制铸造技术制备了减摩轴瓦材料Ａｌ－Ｂｉ偏晶合金,并通过活加第三组元的方法,研究了Ｓｉ,Ｓｎ、Ｐｂ对Ａｌ－Ｂｉ合金凝固组织的影响,合金加热至１０００℃后采用控制铸造技术制蜊均匀铸锭,金相分析结果显示,第三组元Ｐｂ、Ｓｎ对偏晶合金中Ｂｉ粒子的尺寸及形有很大的影响。     

原位TiC粒子增强Al－Si合金的组织及性能

采用新工艺方法──熔铸直接接触反应法制取原位ＴｉＣ粒子增强铸造Ａｌ基复合材料．该方法是将Ａｌ－５．６ｗｔ－％Ｓｉ合金升温至７５０℃，再把Ａｌ－４０ｗｔ－％Ｔｉ－１０ｗｔ－％Ｃ粉末压制块压入，使Ｔｉ和Ｃ在Ａｌ－Ｓｉ合金液中直接反应生成直径为０．１－１．０μｍＴｉＣ颗粒，并均匀地分布在α－Ａｌ基体中，晶界上无明显颗粒聚集，制成品性能优异．     

铸造Al—Si合金熔体处理——晶粒细化

对亚共晶Ａｌ－Ｓｉ铸造合金进行细化处理已成为一种基本操作,中间合金（Ａｌ－Ｔｉ,Ａｌ－Ｔｉ－Ｂ和Ａｌ－Ｂ合金）在亚共晶Ａｌ－Ｓｉ铸造合金中与在工业纯铝和变形铝合金中的晶粒细化行为存在较大的差异,Ａｌ－３Ｔｉ－３Ｂ,Ａｌ－３Ｂ中间合金在Ａｌ－Ｓｉ铸造合金中表现出优异的晶粒细胞化效应,Ｓｉ与晶粒细化剂的交互作用在其中扮演着重要的角色,通过炉前对熔体进行快速热分析可愉对晶粒细化效果和变质程度进行评价和预     

用溶体直接轧制法试制Al—Si合金薄带坯

采用轧制区宽度为４０ｍｍ的封闭孔型的轧机，成功地把Ａｌ－Ｓｉ合金多融状态直接轧制成薄带坏。但当Ｓｉ含量超过１２％或轧制速度超过临界值时会产生表面缺陷。直接轧制带坯的国学性能（抗拉强度和伸长率）优城铸造带的，这是由于轧制带坯的显微组织晶粒较细，并且由于快速凝固和大的压下率而不产生缺陷。亚共晶Ａｌ－Ｓｉ合金直接轧制带坯在厚度上Ｓｉ浓度的分布是不均匀的，可能是由于富Ｓｉ的融液受到压挤所致。     

铸造铝合金现状及未来发展

综述了传统铸造铝合金,Ａｌ－Ｓｉ系,Ａｌ－Ｃｕ系等的研究现状和发展,介绍了先进铸造铝基复合材料的研究和应用前景。提出面对２１世纪的挑战,铸造铝合金的研究和应用必须与先进的制造技术、工艺技术结合起来,使铸造铝合金这种传统的金属材料在新世纪焕发新的光彩。与此同时,随着现代工业的飞速发展,尚需不断地开发研究新合金。     

铝硅合金变质机理的新发展和新观点（上）

铝硅合金变质机理的新发展和新观点（上）上海交通大学黄良余自２０年代初发现Ａｌ－Ｓｉ合金变质现象能明显提高合金的力学性能、切削性能以来，已过去７０余年，为揭开Ａｌ－Ｓｔ合金的变质机制，世界各国的冶金工作者进行了大量的试验研究工作，随着现代测试技术的出现...     

船舶用铝合金材料

本文介绍了船用铝合金的种类，特性，状态，用途实例和产品种类，船用铝合金主要分为船体用铝合金和舾装铝合金，船体用铝合金主要为Ａｌ－Ｍｇ系合金和部分Ａｌ－Ｍｇ－Ｓｉ系合金，舾装用铝合金为工业纯铝，Ａｌ－Ｍｍ系合金，Ａｌ－Ｍｇ－Ｓｉ系合金和ＡＣ系铸造铝合金，而Ａｌ－Ｚｎ－Ｍｇ系合金也可能在造船中得到发展。     

Al—Si—Mn—Fe高电阻率铝合金的研究

试验研究了ＡｌＳｉＭｎＦｅ 合金的金相组织、电阻率和力学性能。为高转矩、高转差率的电机转子找到了一种既满足电阻率要求，又具有好的铸造性能和好的力学性能的铝合金配方，并在电机生产中得到了验证和应用。     

铝合金在海洋环境中的腐蚀研究(Ⅱ)--海水全浸区16年暴露试验总结

总结了铝合金在青岛海域海水全浸区暴露16年的腐蚀结果，防锈铝LF2Y2，LF6M（BL），F21M，180YS在海水全浸区有好的耐蚀性，工业纯铝L4M，锻铝LD2CS的耐蚀性较差，无包铝层的硬铝LY12CZ和超硬铝LC4CS在海水中的耐蚀性很差，硬铝，超硬铝的包铝层起牺牲阳极作用，使基体受到保护，海生物污损对铝合金在海水中的腐蚀有明显影响，镁、锰能提高铝的耐海水腐蚀性，硅明显降低铝的耐蚀性，铜严重损害铝的耐蚀性，腐蚀电位较负的铝合金耐海水腐蚀性较好，腐蚀电位较正的铝合金耐海水腐蚀性较差。     

Influence of La on microstructures of hypereutectic Al-Si alloys

1　INTRODUCTIONThemicrostructureofhypereutecticAl Sialloys ,preparedbyconventionalcastingroutines ,usuallyconsistsofcoarseSicrystals[112 ] ,leadingtothepoorextrudability ,machinability ,strengthandductili ty[1315] .Therefore ,structuralmodificationmustbedonethroughtwo generalways :1)alloyingaddi tions ,and /or ;2 )syntheticalternatives .Accordingtothedimensionalconditionofaneffectivemodifier ,theradiusratiooftheagenttoSishouldbeabout1.6 5 [16 ] ,La ,withtheratioof 1.5 9,ispossiblycon sid…     

铝合金在海洋环境中的腐蚀研究（Ⅰ）：——海水潮汐区16年暴露试验总结

总结了铝合金在青岛海域海水潮汐区暴露16年的腐蚀试验结果，防锈铝LF2Y2、LF6M（BL）、F21M、180YS在海水潮汐区有好的耐蚀性，工业纯铝L4M、锻铝LD2CS的耐蚀性较差，硬铝LY11CZ（BL）、LY12CZ（BL）和超硬铝LC4CS（BL）的包铝层起着牺牲阳极作用，使基体受到保护，海生物污损对铝合金的腐蚀有明显影响，镁，锰能提高铝在海水潮汐区的耐蚀性，硅明显降低铝的耐蚀性，铜严重损害铝的耐蚀性。     

Al-Si基铸铝合金阳极氧化

Al-Si合金由于其良好的性能已在工业中得到了广泛的应用.阳极氧化成为铝合金铸件表面处理的一种重要方式,而阳极氧化膜色差直接影响到铸件的表面质量、使用寿命及外观要求.探讨了影响铸铝阳极氧化的因素,研究了铸铝合金的表面预处理和阳极氧化工艺,讨论了铸铝合金的表面预处理和工艺条件对阳极氧化膜性能的影响,据此优化工艺,获得了合适的表面预处理方法和阳极氧化最佳工艺条件.该工艺操作简便,节约能源,生产效率高,易于推广应用.     

Effects of magnesium content on phase constituents of Al-Mg-Si-Cu alloys

1 Introduction The heat-treatable Al-Mg-Si-Cu(6000 series) alloys used as automotive body sheet materials are being brought to practical use more and more in North American and Europe, and becoming optimal materials caused by mass reduction of automotive …     

Melt flow in a mushy zone – barrier effect of intermetallic phases

Abstract

Iron and manganese are common impurity elements in cast aluminium alloys, especially in secondary aluminium. During casting Fe/Mn-containing intermetallics are formed between the aluminium dendrites, which cause porosity and shrinkage defects. In this paper an experimental study on the influence of controlled convection during solidification on the spatial arrangement of intermetallic phases and their interaction with the dendritic microstructure in Al–7Si–1Fe (AlSiFe) and Al–7Si–1Mn (AlSiMn) alloys (wt-%) is presented. Forced convection is induced by a rotating magnetic field. The alloys are solidified directionally over a range of constant solidification velocities (0·015–0·18 mm s^–1) at a constant temperature gradient G of 3 K mm^–1. The results indicate that the primary spacing and the secondary dendrite arm spacing are affected by the presence of Fe and Mn intermetallic phases. In samples solidified under forced convections the primary dendrite arm spacing did not depend on the solidification velocity and no obvious fluid flow effect on the secondary spacing could be detected. These observations are in contrast to Fe and Mn free alloys. It seems that the intermetallics act as a barrier for the flow into the mushy zone.     

Effect of cooling rate on air gap formation in aluminium alloy permanent mould casting

Abstract

Displacements of the casting surface and the mould surface at the casting/mould interface were experimentally measured during the solidification of aluminium alloys in a permanent mould. Temperatures of the casting and mould surfaces at this interface were also recorded and correlated with displacement measurements. Four different commercial Al–Si alloys were investigated at varying cooling rates. These results are compared with available data on the effect of cooling rate on solid fraction evolution and consequently strength development during solidification. The temperature of the casting surface at the moment of air gap initiation was found to decrease with increasing cooling rate, although this relationship was confirmed at the 95% confidence level for only one of the alloys, AC601, for which sufficient data points were available. The solid fraction at the casting surface at gap initiation in this alloy is shown not to change with cooling rate. In all hypoeutectic alloys, the gap formed before the solid fraction at the casting surface reached 1·0 at slow cooling rates. For the near eutectic alloy BA401 it occurred at almost 1·0. Casting surface contraction rates following gap formation are also presented both as a function of time and casting surface temperature. It is shown that contractions predicted using the linear thermal expansion coefficient provide a reasonable approximation.     

Rendering wrought aluminium alloys castable by means of minimum composition adjustments

Wrought alloys have low fluidity and are prone to hot tearing, which make them difficult to cast. The presence of eutectic-forming elements in the alloy composition lessens these effects. For this reason, the constituents of casting alloys tend to include a eutectic portion. Typically, silicon is added to aluminium alloys to provide casting ability by forming the aluminium–silicon eutectic. However, the presence of silicon in aluminium alloys is associated with a number of issues that do not allow these alloys to reach their full potential. In this publication we report results of our investigation of three alternative eutectics: Al–6.1Ni, Al–1.8Fe, and Al–1.75Fe–1.25Ni. Our results indicate that these eutectics have satisfactory fluidity and resistance to hot tearing and higher strength than the aluminium–silicon eutectic. We also found that introducing these eutectic compositions into 7075 wrought alloy results in a castable composition with yield strength comparable to that of the wrought alloy.     

Sr+B联合熔体处理对Al-Si-Mg合金组织和力学性能的影响

考察了A1—lB中间合金对0．030％Sr变质的A1—11．6％Si0．4％Mg合金组织和力学性能的影响。发现A1—B中间合金在近共晶铸造A1—Si合金中具有优异的枝晶细化能力。通过比较3种不同熔体处理条件下(末变质 未枝晶细化处理、0．030％Sr变质处理、0．030％Sr 0．028％B联合熔体处理)合金铸态和T6状态下的力学性能并对断口形貌进行分析，可以得出在近共晶铸造A1—Si合金中同时加入Sr，B进行枝晶细化和共晶Si变质联合处理是十分必要的。