新的快速凝固技术

从七十年代初期以来,为了提高结构铝合金材料的强度、弹性模量、韧性、抗腐蚀性能和抗疲劳性能,冶金学家采用铸锭冶金方法(IM)进行了广泛的研究,其结果是通过改变原有合金成分、提高基体金属纯度和应用形变热处理技术,发展了一些新的IM铝合金,例如:2124、2048、7050、7149、7010合金,2324-T39和7150-T651板材,2224-T3511和7150-T6511挤压件等等。它们的综合性能比原有的2×××和7×××铝     

综合性能好的LY17铝合金

LY17铝合金是Al-Cu-Mn系中综合性能好的新型变形铝合金,它的强度高,焊接性能和耐蚀性能较好,完全满足当前空间技术对铝材性能的要求.     

未来的金属-铝

一、高强铝合金方面1.高强铝合金的特性高强铝合金是目前研究的主要项目之一.尤其是在航空工业,它占有相当重要的地位.其主要特点是,断裂韧性、疲劳性能、抗腐蚀性能良好,特别是抗应力腐蚀性能优秀.尽管如此,我们对其机械强度及其各种性能都提出了更高的标准.     

5456铝合金挤压型材生产工艺研究

5456铝合金是在A l-Mg系合金基础上,添加适量的Mn、Cr、Ti和Be元素,并严格控制Fe+S i杂质含量而发展的一种新的铝合金,它类似于5A05铝合金。通过试验,研究合金成分、挤压温度、挤压系数、拉伸率等因素对5456铝合金挤压型材组织和性能的影响规律,确定出该合金合理的挤压生产工艺参数,生产出了满足用户要求性能的产品。     

铝基非晶合金的研究进展

铝基非晶合金的研究在最近些年得到了重视,这缘于人们对高强度低密度材料的需求。与传统的晶体铝合金相比,非晶铝合金以其优异的性能令一些材料科学家将注意力转向它。主要介绍了铝基非晶合金的研究历史、主要性能、制备、成型以及发展前景等。     

美国铝业公司6013铝合金简介

介绍了美国铝业公司６０１３铝合金的化学成分，物理，力学和加工性能，热处理制度。它是一种综合性能很好的铝合金，有广阔的应用前景。     

稀土在铝合金表面处理中的应用及研究进展

评述了稀土在铝合金表面处理中的应用及研究进展,尤其是铝合金稀土表面转化膜技术和稀土对铝合金阳极氧化的影响两方面.稀土表面转化膜能够提高铝合金的耐蚀性能,工艺以化学浸泡为主;稀土对铝合金阳极氧化是有益的:它使铝合金接受极化的能力增强,同时提高氧化膜的抗蚀性.因此,稀土应用于铝合金表面处理具有良好的发展前景.     

4All铝合金活塞锻件热处理工艺研究

４Ａｌｌ铝合金是生产活塞锻件的理想材料,它具有耐磨性好、热膨胀系数小的特点。应用正交设计法找了４Ａｌｌ铝合金最佳热处理工艺制度,使活塞锻件的综合性能得到提高,避免了使用中脆性断裂现象。     

新的耐腐蚀性能好的镁合金

美刊〔先进的材料与工艺〕1989年第2期报道,新的镁合金例如AZ91 D,在盐水喷雾试验中的耐腐蚀性能虽然比标准纯度的镁合金提高了两级,但是它在使用环境下的耐腐蚀性能仍赶不上铝合金.现在,Mg-Al-Zn-Nb系合金在含盐水环境中的耐腐蚀性能与2024铝合金的相当.     

成果简报

<正>宁波材料所铝合金表面防护技术研究获进展铝合金密度小、强度高、导电导热性能优良、塑性和成型性好、易加工,被广泛应用于航空航天、军工、建筑、汽车、船舶等领域中。然而铝合金的硬度偏低,耐磨性差,耐腐蚀性较差,限制了其应用。因此,需要对铝合金的表面进行特殊处理而形成防护膜层,提高其抗蚀耐磨性能。改善铝合金表面耐磨和耐腐蚀性最有效的方法是在其表面制备一层薄膜,利用薄膜在铝合金基体和外界环境之间形成的屏障,有效地保护铝合金,扩展它     

Fatigue properties of friction stir welds of treated Al to carbon fibre-reinforced plastic

The purpose of this paper is to establish the welding technology for dissimilar materials of carbon fibre-reinforced plastic. Therefore, this study focused on friction stir spot welding, which can be simply substituted for spot welding which is widely used for welding of automobile body. In this study, friction stir spot welding was used to weld joints of carbon fibre-reinforced plastic and aluminium alloy, and the effect of aluminium alloy surface treatments on the fatigue properties and the fracture mechanism of dissimilar material joints were investigated experimentally and statistically. As a result, it is possible to create welding joints with high fatigue durability by using the surface treatments on the aluminium alloy.     

熔铝用无芯工频感应炉炉衬寿命的探讨

石英砂固有良好的热稳定性,较高的机械性能,较小的热膨胀系数,价格低廉等优点,被广泛用做中小型感应炉的炉守材料,从工频炉熔炼铝合金的工艺特点及对材料性能要求着手,分析了石英砂颗粒配比,打结,烧结对炉衬寿命的影响,用于生产,取得了较满意的效果。     

Aluminum alloys anodisation for nanotemplates application

The aim of this investigation was to reveal the processing differences in achieving nanoporous anodized aluminium from aluminium alloys and their application for cobalt nanowires electrodeposition. The following types of aluminium were tested: pure Al (99.99%), and commercial alloys: AA1050, 6082 and 6060. Because of the differences in the surface temperature and high voltages during the anodizing steps, some stresses can be built up in the material. Therefore a strict temperature control should be done to limit thermal stresses in materials. Alloying elements (Si, Mg) cause precipitates that are observed on the surface, especially for 6060 alloy. Nevertheless, a nanoporous structure can be obtained at the end of second anodization step on all aluminium alloys investigated. It was shown that the number density of pores on the surface is practically independent on the aluminium alloys used. However, the degree of hexagonal distribution of the pores depends on the type of anodized aluminium alloy. Also, a successful fabrication of Co nanowire arrays using nanoporous anodic alumina template produced on Al alloy has been demonstrated, and the uniform filling of the template by cobalt nanowires arrays is discussed.     

Galvanic corrosion of aluminium alloy members of bridge guiderails under severe atmospheric exposure conditions

ABSTRACT

Aluminium alloys are nowadays preferred as materials for bridge guiderails especially for bridges connecting oceanic islands or spanning inlets due to their inherent corrosion resistance. But because of the limited mechanical strength of aluminium alloy, fasteners of guiderail members are made from steel materials. It has been found that contact between bare steel fasteners and aluminium alloy members can cause galvanic corrosion in the aluminium alloy. Research was carried out to investigate the capability of different surface treatments on fasteners and aluminium alloy members to inhibit galvanic corrosion under atmospheric exposure for periods of one and three years. It was found, among other results, that stainless steel fasteners treated with zinc flake coating were the most effective inhibitors of galvanic corrosion on aluminium alloy members.     

铝合金复合材料在汽车轻量化上的应用

推广汽车轻量化,加大铝质配件材料的应用,是我国汽车工业发展的当务之急,对解决我国能源短缺,道路超载、运输效率低下具有很重要的意义.加大铝质配件应用是汽车轻量化的措施之一,分析了汽车轻量化的铝合金材料结构性能,阐述了轻量化以铝为首的轻质材料在汽车上的应用措施,介绍了汽车工业的快速发展将给铝质散热器带来巨大的市场前景,论述了商用车采用铝合金车轮减轻车辆的自重显著,研究了国外汽车制造商大力研发车身轻量化技术,同时指出了轻质材料是汽车安全、节能、环保核心的技术优势和轻量化措施.     

Effect of anodizing on direct joining properties of aluminium alloy and plastic sheets by friction lap joining

We have proposed a novel joining process, friction lap joining (FLJ), to join metallic material sheet directly to polymer sheet and have investigated mechanical and metallurgical properties of these dissimilar joints. The joining mechanism is discussed with an evaluation of the TEM microstructure at the joint interface between A2017 aluminium alloy and two kinds of polymer, ethylene-acrylic acid copolymer (EAA), and high density polyethylene (PE). EAA sheet was easily joined to an as-received aluminium alloy sheet by FLJ, because EAA had a polar functional group, COOH. On the contrary, PE was not able to be joined to an as-received aluminium alloy, because PE had no polar functional group. However, anodizing of aluminium alloy was effective to join these materials by the assistance of the anchor effect.     

Laser roll welding of dissimilar metal joint of titanium to aluminium alloy

Recently, the demand for dissimilar metal joints of titanium to aluminium alloy has arisen in industry, especially in the transportation vehicle industry. However, it is well known that fusion welding of titanium to aluminium alloy is difficult because of generating the brittle intermetallic compound at the joint interface. Therefore, new welding processes with high reliability and productivity for these dissimilar materials are demanded. In the present work, Laser roll welding of titanium to aluminium alloy using a 2 kW fibre laser was tried to investigate the effects of the process parameters on the formation of the interlayer and the mechanical properties of the joint. As a result, the cross-section of the joint shows partial melting of the aluminium sheet and spreading of molten aluminium alloy on the titanium sheet occurs during the welding thermal cycle. Various types of intermetallic compound were confirmed at the interlayer of the welded joint. The specimen with a bonding width of 2.8 mm failed in the base metal of titanium in the tensile shear test. In Erichsen cupping tests, the Erichsen value was 5.7 mm. This value was 89% of the base metal of aluminium sheet.     

A new austenitic alumina forming alloy: an aluminium‐coated FeNi32Cr20

The FeCrAl alloys owe their low oxidation rate to the formation of a slow growing α‐aluminium oxide scale. Therefore they are used, for example, as a substrate material in metal‐supported automotive catalytic converters. Increasing exhaust gas temperatures mean that, in addition to the oxidation properties, high temperature mechanical properties should also be improved. Compared to the ferritic FeCrAl alloys, austenitic alloys possess the required high mechanical strength at higher temperatures. However for most commercially available materials the oxidation resistance is not sufficient due to a low aluminium content. High aluminium contents are avoided in austenitic alloys, since they cause severe workability problems, even at aluminium contents, which are below the necessary amount to get a pure alumina scale. The newly developed material Nicrofer 3220 PAl (coated FeNiCrAl) consists of an austenitic FeNi32Cr20 alloy coated with aluminium on both sides. It combines the outstanding oxidation resistance of an alumina forming FeCrAl alloy with the advantage of the high temperature strength of an austenitic alloy. Additionally the oxidation is even lower than the oxidation of the commercial grade Aluchrom YHf (FeCr20Al6)—conventional homogenous FeCrAl. Aluminium coated FeNiCrAl can easily be formed into its final shape. Prior to service, an in situ heat treatment is recommended in order to optimize the properties.     

铝合金大型挤压材生产现状及应用前景

在大量调查研究工作的基础上,全面论述了国内外铝合金大、中型挤压材生产现状、市场需求和应用前景。指出,铝合金挤压型材是一种永不衰败的材料,特别是铝合金大、中型工业用结构型材更是当今世界短缺紧俏的商品之一。21世纪将是大挤压机和铝合金大、中型挤压材发展的大好时机。     

高性能铝合金厚板的生产技术及应用

介绍了高性能铝合金厚板世界生产格局,高性能铝合金的开发和发展主要是围绕提高材料的强度、塑性、韧性、耐蚀性及疲劳性等综合性能开展研究,其新型合金主要通过调整合金成分、新的合金元素、采用新的加工和制造技术等途径。高性能铝合金厚板主要应用于航空工业、船舶工业、交通运输及工具、铁路和机车业、化工、石化及轻工业等领域。我国许多研究成果达到了国际先进水平,并具备了批量生产能力,但与国外先进水平相比仍有很大差距。