共查询到19条相似文献,搜索用时 93 毫秒
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剧烈塑性变形制备超细晶金属材料是当前的研究热点。基于机制和微观组织变化综述了剧烈塑性变形制备块状超细晶材料的一些方法,特别是给出了两种新型成形技术-等截面椭圆变通道扭挤和等截面椭圆转变通道扭拉,此外还阐述了剧烈塑性变形存在的问题及未来的研究方向。 相似文献
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剧烈塑性变形(SPD)是制备超细晶材料的重要技术手段。基于国内外在钛及钛合金剧烈塑性变形领域所取得的成果,介绍了等通道转角挤压、搅拌摩擦加工、高压扭转、累积叠轧和多向锻造5种典型的剧烈塑性变形技术的基本原理和研究进展,探讨分析了剧烈塑性变形对钛及钛合金组织演变和力学性能的影响。指出了目前钛及钛合金剧烈塑性变形技术所存在的问题,并对今后的发展进行了展望。 相似文献
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剧烈塑性变形制备超细晶金属材料是当前的研究热点。基于机制和微观组织变化综述了剧烈塑性变形制备块状超细晶材料的一些方法,特别是给出了两种新型成形技术-等截面椭圆变通道扭挤和等截面椭圆转变通道扭拉,此外还阐述了剧烈塑性变形存在的问题及未来的研究方向。 相似文献
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一种椭圆截面螺旋等通道挤压制备超细晶材料的新工艺 总被引:1,自引:0,他引:1
近年来,对剧烈塑性变形法制备块体超细晶(UGF)材料的研究已成为材料科学领域的一大热点.基于剧烈塑性变形制备超细晶材料的机理研究,提出了一种新型成形技术——椭圆螺旋等通道挤压法(ECEA).本文系统地阐述了ECEA的基本原理、工艺特点和变形过程,给出了ECEA累积等效应变的解析解计算式.通过有限元模拟,分析了ECEA工... 相似文献
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综述了采用剧烈塑性变形技术制备块体超细品和纳米晶结构金属的主要方法,如等通道转角挤压、高压扭转、累积轧合与往复挤压.并介绍了两种完全有别于传统的剧烈塑性变形制备超细晶和纳米晶金属材料的最新工艺,如大应变切削和大应变挤压切削.系统地阐明了这些方法的基本原理、变形特点及应用,分析其优缺点并提出改进措施与发展方向. 相似文献
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《特种铸造及有色合金》2017,(8)
综述了大塑性变形法制备超细晶材料的研究进展,主要介绍了等通道角挤压和高压扭转法两种主要的变形工艺,探讨了超细晶的晶粒细化原理,分析了大塑性变形加工对材料力学性能和腐蚀性能的影响,展望了利用大塑性变形技术制备超细晶结构金属材料的应用前景。 相似文献
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Terry C. Lowe Ruslan Z. Valiev 《JOM Journal of the Minerals, Metals and Materials Society》2004,56(10):64-68
Severe plastic deformation (SPD) has emerged as a promising method to produce ultrafine-grained materials with attractive
properties. Today, SPD techniques are rapidly developing and are on the verge of moving from lab-scale research into commercial
production. This paper discusses new trends in the development of SPD techniques suchas high-pressure torsion and equal-channel
angle pressing, as well as new alternative techniques for introducing SPD. The paper also contains a comparative analysis
of SPD techniques in terms of their relative capabilities for grain refinement, enhancement of properties, and potential to
economically produce ultrafine-grained metals and alloys.
For more information, contact Terry C. Lowe, Science and Technology Base Programs, Los Alamos National Laboratory, Los Alamos,
NM 87545; (505) 667-7824; fax (505) 665-3199; e-mail tlowe@lanl.gov. 相似文献
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大塑性变形制备超细晶复合材料的研究进展 总被引:3,自引:1,他引:2
介绍了等径角挤压(ECAP)、往复挤压(CEC)、高压扭转(HPT)和累积叠轧(ARB)4种技术的加工原理,系统阐述了大塑性变形(SPD)制备铝基、镁基、铜基超细晶(UFG)复合材料的研究进展,指出SPD技术是细化复合材料基体、均匀弥散增强相从而提高强度、硬度和塑性的有效手段,并展望了其研究范围将由有色金属基复合材料拓宽到铁基、陶瓷基、聚合物基等复合材料。 相似文献
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综述了大塑性变形工艺制备超细晶铝锂合金的显微组织及其力学性能,分析了大塑性变形过程中铝锂合金的组织演变及其影响因素。铝锂合金的强化机制主要是基于析出强化,结合大塑性变形得到的超细晶粒组织可以显著提高强度和塑性,并得到优异的超塑性。表明大塑性变形加工铝锂合金,尤其是等通道挤压制备的超细晶铝镁锂合金在超塑性工业具有广阔的发展前景。 相似文献
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In recent years, materials with ultrafine grain size(UFG) have attracted much attention. By using severe plastic deformation(SPD) techniques, materials with fine grain size as small as 200 - 250 nm have been obtained.However, the nature of the grain boundaries has not been theoretically understood. It is still an unsolved question whether or not finer grain sizes down to 100 nm could he reached. A semi-quantitative model for the evolution of dislocation cells in plastic deformation was proposed. The linear stability analysis of this model leads to some interesting results, which facilitate the understanding of the formation of cell structures and of the factors determining the lower limit of the cell size of SPD materials. 相似文献
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Igor V. Alexandrov 《Metals and Materials International》2001,7(6):565-571
The results of a detailed microstructural characterization of bulk SPD processed nanostructured materials, and their interpretations
obtained by application of the modem techniques of structural analysis are presented. It is shown that the application of
advanced X-ray methods as well as TEM investigations results in evaluation of rather comprehensive information on the microstructure
of SPD materials. This information includes values of the crystal lattice parameter, coherently scattering domain size, elastic
microdistortions, atomic displacements, crystallographic texture, etc. 相似文献
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Bulk Nanostructured Metals for Innovative Applications 总被引:1,自引:0,他引:1
Ruslan Z. Valiev Ilchat Sabirov Alexander P. Zhilyaev Terence G. Langdon 《JOM Journal of the Minerals, Metals and Materials Society》2012,64(10):1134-1142
Nanostructuring of various materials is a key for obtaining extraordinary properties that are very attractive for different structural and functional applications. During the last two decades, the production of bulk nanostructured materials (BNMs) by severe plastic deformation (SPD) techniques has attracted special interest since it offers new opportunities for the fabrication of commercial nanostructured metals and alloys for various specific applications. Very significant progress has been made in this area in recent years, which is evident by the first production of advanced pilot articles from nanostructured metals with new functionality. These aspects of innovations of BNMs processed by SPD are discussed in this overview. 相似文献