共查询到19条相似文献,搜索用时 78 毫秒
1.
变形镁合金的研究、开发及应用 总被引:138,自引:32,他引:138
综述了国内外主要的变形镁合金材料的基本特性、力学性能和应用领域,介绍了目前变形镁合金材料的研究现状和进展,以及制备高性能变形镁合金材料的新工艺,探讨了镁合金的合金化原理和主要合金元素在变形镁合金中的作用,重点阐述了稀土元素对变形镁合金控能的影响及稀土镁合金的研究与进展。塑性变形与热处理工艺相结合,可获得高强度和优良延展性、更多样化性能的镁合金结构材料。变形镁合金将成为21世纪重要的商用轻质结构材料。 相似文献
2.
3.
4.
5.
6.
镁合金是目前金属结构材料中最轻的材料,挤压变形是镁合金变形最常用的方法,在提高镁合金综合性能方面具有显著的作用。综述了镁合金挤压变形的传统挤压方法和非传统挤压方法,其中传统挤压方法包括正挤压、反挤压、等通道转角挤压等,非传统挤压方法包括等通道转角膨胀挤压、复合挤压、连续变截面直接挤压等;介绍了挤压变形在制备铝/镁合金复合材料等方面取得的研究进展;分析了不同挤压变形方法在细化镁合金晶粒、提高力学性能等方面的作用和机理。提出采用创新的挤压变形方法,制备出不仅具有优异的力学性能,而且兼备较高的抗腐蚀性能的铝/镁合金复合材料,将是镁合金挤压变形技术未来发展的趋势。 相似文献
7.
8.
9.
10.
11.
12.
变形镁合金中的织构及其优化设计 总被引:3,自引:0,他引:3
针对变形镁合金存在的典型织构以及织构优化设计方面的研究工作和进展进行综合评述。镁合金由于基面滑移和{1 012}孪生是最容易开动的变形模式,在变形镁合金中容易形成挤压丝织构及轧制板织构。通过引入剪切变形,改变成型过程中外加应力的取向,能够有效地改变变形镁合金的织构,同时通过添加微量稀土元素Nd、Ce和Y等,能够明显弱化或随机化变形镁合金织构。织构随机化后的镁稀土合金具有较好的强韧性,合金的变形各向异性得以改善。添加稀土元素后会改变稀土元素与Mg原子间的键能,改变稀土元素周围Mg-Mg原子之间的结合能等,增加非基面滑移的可能性,减弱基面滑移及{1 012}孪生所占的比率,有效地弱化镁合金的织构。 相似文献
13.
多向锻造对变形镁合金AZ31组织和力学性能的影响 总被引:1,自引:0,他引:1
文章采用不同锻造工艺对电磁连铸变形镁合金AZ31铸锭进行了多向锻造研究。结果表明,通过大变形的多向锻造后,变形镁合金AZ31可以得到有效细化,多向锻造有利于变形镁合金发生再结晶,锻造后变形镁合金AZ31最终得到均匀细小的等轴晶组织。工艺3得到最好的综合性能,锻造后变形镁合金AZ31硬度和抗拉强度分别提高了22.5%和33.5%,延伸率也有所提高。多向锻造后,室温拉伸试样的断口形貌出现大量的韧窝,表现为剪切断裂为主的韧性断裂。 相似文献
14.
MICROSTRUCTURE MODIFICATIONS OF WROUGHT AND CAST TiAl ALLOYS 总被引:3,自引:2,他引:1
《中国有色金属学会会刊》1999,(Z1)
1 INTRODUCTIONGammaTiAlalloyshaveattractedagreatdealofinterestsfromtheaerospaceandautomobileindustriesinChinainthepast5years.AfewTiAlcomponentshavebeenfabricatedbyeithercastingorhotworking.However,therearestillmanytechnicalissueswhichremainasbarri… 相似文献
15.
16.
The effect of hydrogen charging on the mechanical behaviour of 5083 wrought aluminum alloy 总被引:1,自引:0,他引:1
The effect of hydrogen cathodic charging on the mechanical behaviour of 5083 wrought aluminum alloy has been studied. Hardening of the surface layers of the examined alloy, due to hydrogen absorption, was observed. The tensile tests revealed that the ductility of 5083 wrought aluminum alloy decreased with increasing hydrogen charging time, for a constant value of charging current density, and with increasing charging current density, for a constant value of charging time. However, the ultimate tensile strength of the examined alloy was slightly affected by the hydrogen charging procedure. The cathodically charged 5083 wrought aluminum alloy exhibited brittle transgranular fracture at the surface layers and ductile intergranular fracture at the deeper layers of the alloy. 相似文献
17.
18.
19.
M. R. Stoudt R. E. Ricker E. A. Lass L. E. Levine 《JOM Journal of the Minerals, Metals and Materials Society》2017,69(3):506-515
The additive manufacturing build process produces a segregated microstructure with significant variations in composition and phases that are uncommon in traditional wrought materials. As such, the relationship between the postbuild microstructure and the corrosion resistance is not well understood. Stainless steel alloy 17-4 precipitation hardened (SS17-4PH) is an industrially relevant alloy for applications requiring high strength and good corrosion resistance. A series of potentiodynamic scans conducted in a deaerated 0.5-mol/L NaCl solution evaluated the influence of these microstructural differences on the pitting behavior of SS17-4. The pitting potentials were found to be higher in the samples of additively processed material than in the samples of the alloy in wrought form. This indicates that the additively processed material is more resistant to localized corrosion and pitting in this environment than is the wrought alloy. The results also suggest that after homogenization, the additively produced SS17-4 could be more resistant to pitting than the wrought SS17-4 is in an actual service environment. 相似文献