共查询到18条相似文献,搜索用时 78 毫秒
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变形镁合金的研究与开发应用 总被引:4,自引:0,他引:4
综述了镁及其合金的特性与用途,讨论了变形镁合金的研究焦点与生产中存在主要的问题.介绍了变形镁合金的现状与进展,以及变形镁合金开发应用领域和前景。 相似文献
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镁合金作为21世纪的绿色环保工程材料,近年来已成为全球学术界的一个研究热点,并越来越受到工业界的重视。目前我国在镁合金的研究和应用上取得了很大进展,已经研制出耐热镁合金、高强高韧镁合金等新材料,在变形镁合金领域也取得了突破,本文重点介绍几种有特色和良好应用前景的高性能镁合金,以及镁合金成形加工技术的最新研究进展。高性能镁合金包括阻燃镁合金、低成本高强度铸造镁合金和高强耐热变形镁合金,成形加工技术包括镁合金涂层转移精密铸造技术、镁合金熔体复合纯净化技术、不含六价铬离子的镁合金超声阳极氧化表面处理技术、大型镁铸件低压成型技术以及镁板差温拉深工艺。镁合金的深入研究有力地推动了镁合金产业的发展。 相似文献
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含稀土镁合金的研究与开发 总被引:68,自引:12,他引:56
重点阐述了含稀土镁合金的研究,开发和应用情况,比较了稀土在铸造、变形及快速凝固镁合金中的物理化学作用,并简介了我国稀土镁合金材料的研究开发现状。 相似文献
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镁合金功能材料的研究进展 总被引:2,自引:1,他引:1
陈先华 《稀有金属材料与工程》2016,45(9):2269-2274
与其它结构金属材料相比镁合金具有质轻的显著优点,因此被广泛应用于交通运输和航空等领域。随着研究的深入和研究范围的扩大,镁合金更多的优点被开发利用:较高的理论能量密度,较大的阻尼容量和屏蔽效能以及良好的生物相容性,因此镁合金具有作为储氢材料、可再充电电池、阻尼材料、可生物降解的植入材料、电磁屏蔽材料、导热材料的潜力,但是每一种功能性材料都存在未解决的瓶颈问题,本文对近十年的大量的研究进行了概括,总结了镁及镁合金作为以上六种功能材料的主要研究方向及研究进展,讨论了未来主要的研究方向。 相似文献
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镁合金在热加工过程中的变形机制复杂,且容易受到材料初始工艺状态和变形条件影响,因此呈现出不同的应力应变关系。采用铸态和变形态的AZ31B作为研究对象,通过Gleeble-1500获取坯料的应力应变曲线随温度和应变率的变化关系,基于Arrhenius双曲正弦型函数构建两种不同工艺状态下镁合金的本构模型,分析初始加工状态对镁合金应力应变关系及变形机制的影响。实验结果表明:当应变速率大于0.1s-1,变形态镁合金在低温下由于变形织构及大量孪生产生而出现45°剪切断裂;在高温和低应变速率下两种工艺状态的镁合金变形机制相同,应力应变曲线基本相似;变形态镁合金的硬化指数n及变形激活能Q相比铸态镁合金更低。 相似文献
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镁合金成形技术的开发与应用 总被引:22,自引:2,他引:20
概述了镁工业的发展过程及现状,镁合金的基本特性和优良性能,镁合金在电子、汽车、自行车等行业的应用情况及前景,常用铸造镁合金和变形镁合金的成分、力学性能及特性,镁合金压铸技术的现状与发展前景,变形镁合金制品的生产方法和镁合金的超塑性。 相似文献
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Nowadays, a significant part of postconsumed wrought aluminum scrap is still used for the production of comparatively cheaper cast alloys, in that way losing an important part of the potential added value. The share of postconsumed scrap in wrought aluminum alloys could be increased either by sorting to fractions with the required chemical composition and/or by broadening the standard compositional tolerance limits of alloying elements. The first solution requires hand or automatic sorting of postconsumed scrap as alloys or groups of alloys to the degree of separation sufficient to enable the blending of standard compositions of wrought alloys; the second solution is much more radical, predicting changes in the existing standards for wrought aluminum alloys toward nonstandard alloys but yet having properties acceptable for customers. In this case, the degree of separation of incoming postconsumed scrap required is much less demanding. The model presented in this work enables the design of optimal (standard and nonstandard recycling-friendly) compositions and properties of wrought aluminum alloys with significantly increased amounts of postconsumed scrap. The following two routes were modeled in detail: (I) the blending of standard and nonstandard compositions of wrought aluminum alloys starting from postconsumed aluminum scrap sorted to various degrees simulated by the model and (II) changing the initial standard composition of wrought aluminum alloys to nonstandard “recycling-friendly” ones, with broader concentration tolerance limits of alloying elements and without influencing the selected alloy properties, specified in advance. The applied algorithms were found to be very useful in the industrial design of both procedures: (I) the computation of the required chemical composition of the scrap streams obtained by sorting (or, in other words, the postconsumed scrap sorting level), necessary for achieving the standard wrought alloy composition and (II) the transformation of standard to nonstandard (recycling-friendly) compositions with the key alloy properties (e.g., tensile strength and elongation) remaining the same. 相似文献
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Warm deep drawing of wrought magnesium alloy sheets produced by semi-solid roll strip-casting process 总被引:1,自引:0,他引:1
H. Watari N. Koga K. Davey T. Haga M.T. Alonso Ragado 《International Journal of Machine Tools and Manufacture》2006,46(11):1233-1237
This paper is concerned with the development of a continuous strip-casting technology to facilitate the manufacture of magnesium sheet alloys economically whilst maintaining high quality. Established in the paper is warm formability of cast magnesium alloy sheets after being hot rolled by semi-solid roll strip-casting process. It has been found that magnesium sheet with 2.0–4.0 mm thickness could be produced at a speed of 25 m/min. Hot rolling and annealing temperatures during hot rolling were also changed to examine which condition would be appropriate for producing wrought magnesium alloys with good formability. Microstructures of the crystals of the manufactured wrought magnesium alloys were observed. It has been found that a limiting drawing ratio of 2.7 was possible in a warm deep-drawing test of the cast magnesium alloy sheets after being hot rolled. 相似文献
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Magnesium alloy applications in automotive structures 总被引:2,自引:0,他引:2
Mark Easton Aiden Beer Matthew Barnett Chris Davies Gordon Dunlop Yvonne Durandet Stuart Blacket Tim Hilditch Peter Beggs 《JOM Journal of the Minerals, Metals and Materials Society》2008,60(11):57-62
The use of magnesium alloys in structural applications has great potential for the lightweighting of transportation vehicles.
Research within the CAST Cooperative Research Centre has tackled some of the important issues related to the use of magnesium
in structural applications. To this end, a new alloy with extrudability and properties similar to 6000 series aluminum alloys
has been developed. Furthermore, a method of laser heating magnesium alloys before self-piercing riveting has enabled high-integrity
joining between magnesium components or between magnesium and dissimilar metals. In this paper, new technologies and improved
understanding of the deformation behavior of wrought magnesium alloys are discussed in light of key metallurgical features
such as alloy composition, grain size, and work hardening rate.
All are part of CAST Co-operative Research Centre. 相似文献
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Microstructure and mechanical properties of wrought magnesium alloy AZ31B welded by laser-TIG hybrid 总被引:5,自引:0,他引:5
The laser-TIG hybrid welding was mainly used to weld the wrought magnesium alloy AZ31B. The tech-nical characteristics of laser-TIG hybrid welding process was investigated and the interactional mechanism between laser and arc was discussed, at the same time the microstructure and mechanical properties of the wrought magnesi-um alloy AZ31B using laser-TIG hybrid welding were analyzed by optical microscope, EPMA, SEM, tensile ma-chine, hardness machine. The experimental results show that the presence of laser beam boosts up the stability of the arc during high speed welding and augments the penetration of weld; the crystal grains of magnesium alloy weld are fine without porosity and cracks in the best welding criterion and the microstructure of HAZ does not become coarse obviously. The elements profile analysis reveals that Mg content in the weld is lower than that of the base metal, but Al content is higher slightly. Under this experimental condition, the wrought magnesium alloy AZ31B joint can be achieved using laser-TIG hybrid process and the tensile strength of the joint is equivalent to that of the base metal. 相似文献
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国内外镁合金材料专利的分析 总被引:5,自引:0,他引:5
调研了近10年来有关镁合金材料的德温特专利,分析了在高强度、耐热、耐蚀、阻燃、抗蠕变镁合金方面所取得的专利科研成果。从专利内容、专利申请国家,申请公司和申请时间分布等方面,对镁合金材料的专利情况进行了全面分析。 相似文献