共查询到16条相似文献,搜索用时 93 毫秒
1.
镁合金由于具有质量轻、比强度和比刚度高以及良好的铸造性能等特点,在理论研究和实际应用上引起了人们极大的关注。近年来,世界各国纷纷致力于镁合金的研究开发。本文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舍金中的作用。 相似文献
2.
3.
4.
5.
6.
7.
8.
9.
本文研究了固溶处理和固溶+时效处理对挤压变形AM20镁合金低周疲劳性能的影响。结果表明,不同制度的热处理对挤压变形AM20镁合金循环变形抗力的影响与外加总应变幅的高低有关;不同处理状态的挤压变形AM20镁合金的塑性应变幅、弹性应变幅与疲劳断裂时的载荷反向周次之间的关系可分别用Coffin--Manson和Basquin公式来描述。此外,不同处理状态的挤压变形AM20镁合金的循环应力幅与塑性应变幅之间呈线性关系。 相似文献
10.
11.
12.
超高强韧镁合金的研发对推广镁合金在高技术领域的应用具有重要意义。镁与稀土均是我国的优势资源,因此在我国发展超高强韧稀土镁合金具有得天独厚的优势,其中Mg-Gd-Y-Zn-Zr系变形镁合金因其接近高强铝合金的超高强度和塑性,近年来受到研究者的广泛关注。综述了超高强韧Mg-Gd-Y-Zn-Zr系变形镁合金的合金成分、常规塑性变形工艺、新型剧烈塑性变形工艺和热处理工艺对该合金显微组织和力学性能的影响规律,以及该超高强韧变形镁合金的显微组织特征和强韧化机理。T5峰时效态超高强韧Mg-8.2Gd-3.8Y-1Zn-0.4Zr(质量分数)挤压合金具有双峰分布的晶粒尺寸“软-硬”复合层片微结构,以及由高密度的基面γ′纳米片状析出相和棱柱面β′纳米析出相形成的近连续网状结构,该挤压合金室温拉伸屈服强度、拉伸强度和断裂延伸率分别为466 MPa、514 MPa和14.5%。介绍了哈尔滨工业大学等单位在超高强韧Mg-Gd-Y-Zn-Zr系变形镁合金的规模化制备和应用方面的研究进展,并展望了Mg-Gd-Y-Zn-Zr系变形镁合金的发展趋势。 相似文献
13.
J. D. Robson 《Materials Science & Technology》2015,31(3):257-264
This assessment is focussed on wrought magnesium alloys for lightweight applications, particularly in the transport sector. The challenges to their wider use are summarised, including poor low temperature formability, corrosion issues, dissimilar metal joining, and limited precipitation strengthening. The fundamental origins of these challenges, and current research to address them, are highlighted. Key developments such as the use of dilute rare earth additions to manipulate texture for improved formability are discussed. Opportunities to exploit the unique properties of wrought magnesium alloys where further research is required are identified. 相似文献
14.
Intermetallic phases can be found in almost every magnesium alloy. These intermetallic compounds play a very important role in optimizing the microstructure and mechanical properties. The present paper reviews the effects of intermetallics in magnesium alloys mainly based on their stabilities: dissolvable intermetallics at low temperatures and thermal stable intermetallics at elevated temperatures. The effects of intermetallics are discussed in the age hardenable and creep resistant magnesium alloys, separately. Finally, the further investigations are remarked on the intermetallics, including their precipitation processes, crystal structures and crystallographic orientation relations with magnesium matrix. The aim is to supply useful information in developing new wrought and creep‐resistant magnesium alloys which will be used in the powertrain at elevated temperatures. 相似文献
15.
Magnesium based degradable biomaterials: A review 总被引:1,自引:0,他引:1
Magnesium has been suggested as a revolutionary biodegradable metal for biomedical applications. The corrosion of magnesium, however, is too rapid to match the rates of tissue healing and, additionally, exhibits the localized corrosion mechanism. Thus it is necessary to control the corrosion behaviors of magnesium for their practical use. This paper comprehensively reviews the research progress on the development of representative magnesium based alloys, including Mg-Ca, Mg-Sr, Mg-Zn and Mg-REE alloy systems as well as the bulk metallic glass. The influence of alloying element on their microstructures, mechanical properties and corrosion behaviors is summarized. The mechanical and corrosion properties of wrought magnesium alloys are also discussed in comparison with those of cast alloys. Furthermore, this review also covers research carried out in the field of the degradable coatings on magnesium alloys for biomedical applications. Calcium phosphate and biodegradable polymer coatings are discussed based on different preparation techniques used. We also compare the effect of different coatings on the corrosion behaviors of magnesium alloys substrate. 相似文献
16.
The commonly used hyperbolic sine constitutive equation for metal forming at elevated temperatures, with no strain incorporated,
is in principle applicable only to deformation in the steady state. However, the actual deformation processes applied to magnesium
alloys are mostly in the non-steady state. In the present research, the results of hot uniaxial compression tests of three
wrought magnesium alloys covering wide ranges of temperatures and strain rates were used for a strain-dependent constitutive
analysis. A strain-dependent constitutive relationship for these alloys was established. It appeared that the apparent activation
energy for deformation decreased with increasing the alloying content in these alloys. The constitutive parameters obtained
were used to predict flow stresses at given strains and the results were in good agreement with experimental measurements. 相似文献