共查询到19条相似文献,搜索用时 156 毫秒
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Ti40合金热压缩变形过程的开裂行为研究 总被引:2,自引:1,他引:1
用渗流铸造法制备了3种特殊孔结构(宽孔径范围孔结构、层状梯度孔结构、层状周期孔结构)的Al-Si12泡沫,对其吸声性能进行了研究.结果表明,相同厚度下,层数多的层状梯度孔径结构泡沫铝的吸声性能优于层数少的梯度孔径结构泡沫铝;层数多的层状周期孔结构泡沫铝的吸声性能比层数少的周期孔结构泡沫铝的吸声性能略有提高;具有4层周期孔结构的Al-Si12泡沫铝样品具有较好的吸声性能,其平均吸声系数为0.82,比常规单一孔径结构的泡沫铝的平均吸声系数提高了0.21,其原因与扩张室结构、流阻及微型谐振腔有关. 相似文献
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用渗流铸造法制备了3种特殊孔结构(宽孔径范围孔结构、层状梯度孔结构、层状周期孔结构)的Al-Si12泡沫,对其吸声性能进行了研究。结果表明,相同厚度下,层数多的层状梯度孔径结构泡沫铝的吸声性能优于层数少的梯度孔径结构泡沫铝;层数多的层状周期孔结构泡沫铝的吸声性能比层数少的周期孔结构泡沫铝的吸声性能略有提高;具有4层周期孔结构的Al-Si12泡沫铝样品具有较好的吸声性能,其平均吸声系数为0.82,比常规单一孔径结构的泡沫铝的平均吸声系数提高了0.21,其原因与扩张室结构、流阻及微型谐振腔有关。 相似文献
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泡沫铝合金显微组织和压缩力学性能的研究 总被引:3,自引:1,他引:3
采用Si、Mg及Cu元素进行合金化处理,制备了几种不同力学性能的开孔泡沫铝,并通过准静态压缩实验,研究合金化对泡沫铝压缩力学行为与吸能特征的影响。实验结果表明:采用Si、Mg及Cu元素合金化处理显著改变了泡沫铝的应力-应变行为与吸能特征,使泡沫铝的屈服强度提高,吸能性大幅度上升。另外,还研究了渗流法制备工艺对泡沫铝微观组织和性能的影响,结果显示由于渗流法制备过程特殊的凝固条件,使得泡沫铝的微观组织比相同成分的铸造铝合金的组织明显粗大。 相似文献
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纤维增强铝基复合材料及其应用 总被引:1,自引:1,他引:0
纤维增强铝基复合材料由于具备各种特殊性能或优良的综合性能,越来越受到人们的重视。讨论了纤维增强铝 基复合材料的主要组成部分——作为增强剂的纤维,并列举了若干典型纤维增强铝基复合材料的性能,以及纤维增强铝基 复合材料应用实例。 相似文献
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In the past it has already been proven that aluminum foam is a construction material appropriate for numerous applications.
Especially in domains such as machine tool manufacturing and vehicle construction the combination of lightweight design and
vibration damping is of great importance and aluminum foam can unfold its full potential. The widespread use of aluminum foam
is still hampered by the high production costs resulting from the expensive production process and starting materials. The
present work focuses on studies of alternative, cheaper starting materials. The results of current investigations follow the
idea that aluminum chips may be successfully used as base material instead of atomized powders, without negatively influencing
the macroscopic foam structure. It could also be proven that good foaming rates can be achieved with calcium carbonate as
foaming agent for aluminum. That's why already in the near future, it will be possible to use recycling materials like aluminum
chips in the series production of aluminum foams by the powder metallurgical process (PM process). Since sorted aluminum chips
cost less than 1 €/kg, and calcium carbonate costs only a fraction of titanium hydride, a distinct price reduction for aluminum
foam, and the lowering of the inhibition threshold for its application should be possible. Further studies are required to
examine the static and dynamic properties of the foams and to compare them with conventional aluminum foams. 相似文献
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激光熔覆通过激光加热使熔覆材料与基体形成冶金结合的高质量熔覆层,是一种有效的表面改性技术。 铝合金因其硬度低、耐磨性差导致其无法满足对表面性能要求较高的领域,限制了其更广阔的发展。 激光熔覆对铝合金表面改性有着很好的研究和应用价值,已获得国内外学者的密切关注。 目前,铝合金激光熔覆技术研究呈上升趋势,然而缺乏系统的综述介绍。 以熔覆层材料体系为核心,按照金属基合金、陶瓷增强复合材料和一些新兴材料进行分类,综述了铝合金激光熔覆的背景、工艺以及组织性能,并对铝合金表面激光熔覆发展前景进行了展望。 相似文献
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It is shown that the addition of scandium considerably influences the structure and properties of aluminum and its alloys. Scandium is the strongest inoculant of the cast grain structure of aluminum alloys, the strongest suppressor of recrystallization, and the strongest hardener (per 0.1% of the additive). The addition of zirconium intensifies and stabilizes the action of scandium. Commercial aluminum alloys alloyed with scandium and zirconium and a technology for fabricating deformed semiproducts from them are presented. The combination of operating properties of scandium-bearing aluminum alloys is substantially superior to that of traditional aluminum alloys. 相似文献
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粉末压实熔化法(Powder Compact Melting,简称PCM法)是制备闭孔泡沫铝合金的方法之一。目前,通过对此方法进行改进,能够制备具有先进孔形(Advanced Pore Morphology,APM)的微型泡沫铝,所得产品内部为均匀的高孔隙率的多孔结构,并且利用所制得的微型泡沫铝,可以制备大尺寸的泡沫铝及其复合结构。综述了先进孔形微型泡沫铝及其复合结构的制备工艺,对其结构特征及力学性能进行了总结,分析了此工艺目前存在的问题,并对其发展前景进行了展望。 相似文献
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对Ce作为环境工程材料、环境降解材料、能源材料在脱硫、脱硝、汽车尾气净化、光催化、石油化工、塑料、燃料电池等环境保护领域的利用和发展现状进行了综述. 相似文献
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The calculation of thermophysical properties of stainless steel castings and its application to casting simulation is discussed. It is considered that accurate thermophysical properties of the casting alloys are necessary for the valid simulation of the casting processes. Although previous thermophysical calculation software requires a specific knowledge of thermodynamics, the calculation method proposed in the present study does not require any special knowledge of thermodynamics, but only the information of compositions of the alloy. The proposed calculator is based on the CALPHAD approach for modeling of multi-component alloys, especial y in stainless steels. The calculator proposed in the present study can calculate thermophysical properties of eight-component systems on an iron base alloy (Fe-C-Si-Cr-Mn-Ni-Cu-Mo), and several Korean standard stainless steel alloys were calculated and discussed. The calculator can evaluate the thermophysical properties of the alloys such as density, heat capacity, enthalpy, latent heat, etc, based on full Gibbs energy for each phase. It is expected the proposed method can help casting experts to devise the casting design and its process easily in the field of not only stainless steels but also other alloy systems such as aluminum, copper, zinc, etc. 相似文献