共查询到20条相似文献,搜索用时 829 毫秒
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通过在Fe3Al粉末中添加挥发性造孔剂,利用粉末冶金技术制备了Fe3Al金属间化合物多孔材料,研究了其孔隙特性和成孔机理,并通过计算分析了孔隙比表面积及平均有效孔径.结果表明:随着Fe3Al多孔材料的开孔隙率不断增加,材料比表面积不断减小,平均有效孔径不断增大;通过近似计算,得出添加25%聚甲基丙烯酸甲酯(PMMA)的试样平均有效孔径达到21.6μm,比表面积超过2000cm2·cm-3;Fe3Al多孔材料内部大孔壁上的微孔可以帮助造孔剂顺利挥发排除,也可以增加Fe3Al多孔材料比表面积和渗透性能. 相似文献
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《机械工程材料》2017,(9)
采用搅拌摩擦加工(FSP)技术制备了金属间化合物增强铝基(IMC/Al)复合材料,通过扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)和拉伸试验机等研究了分散剂SiC和CNTs对复合材料组织的均匀性、增强相含量与尺寸及拉伸强度的影响。结果表明:通过FSP制备IMC/Al复合材料时出现镍粉团聚现象,团聚体的形状主要为类条形和类椭圆形;分散剂的添加对镍粉的团聚起到抑制作用,改善了复合材料复合区组织的均匀性,其中CNTs抑制镍粉团聚的效果优于SiC的;分散剂的添加促进了铝和镍原位反应的进行,使得复合材料中增强相Al3Ni的数量增多;分散剂的添加提高了复合材料的力学性能,添加CNTs制备复合材料的最大抗拉强度为171MPa,比未添加分散剂制备复合材料的提高了15.5%。 相似文献
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采用熔体发泡法制备了孔结构均匀、孔隙率高的泡沫铝材料,系统研究了铝粉(增粘剂)含量、增粘搅拌时间、保温时间和发泡剂的含量对孔隙率和孔结构的影响。对铝粉在铝熔体中的增粘机理以及在发泡过程中对气泡的稳定作用进行了讨论。结果表明:加入质量分数5%铝粉,搅拌时间7 min,发泡剂TiH2质量分数1.5%,保温5 min的条件下,可以得到孔结构均匀、孔隙率约75%的泡沫铝硅合金材料。 相似文献
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《Wear》2004,256(7-8):705-713
The purpose of this study is to investigate the wear properties of Saffil/Al, Saffil/Al2O3/Al and Saffil/SiC/Al hybrid metal matrix composites (MMCs) fabricated by squeeze casting method. Wear tests were done on a pin-on-disk friction and wear tester under both dry and lubricated conditions. The wear properties of the three composites were evaluated in many respects. The effects of Saffil fibers, Al2O3 particles and SiC particles on the wear behavior of the composites were elucidated. Wear mechanisms were analyzed by observing the worn surfaces of the composites. The variation of coefficient of friction (COF) during the wear process was recorded by using a computer. Under dry sliding condition, Saffil/SiC/Al showed the best wear resistance under high temperature and high load, while the wear resistances of Saffil/Al and Saffil/Al2O3/Al were very similar. Under dry sliding condition, the dominant wear mechanism was abrasive wear under mild load and room temperature, and the dominant wear mechanism changed to adhesive wear as load or temperature increased. Molten wear occurred at high temperature. Compared with the dry sliding condition, all three composites showed excellent wear resistance when lubricated by liquid paraffin. Under lubricated condition, Saffil/Al showed the best wear resistance among them, and its COF value was the smallest. The dominant wear mechanism of the composites under lubricated condition was microploughing, but microcracking also occurred to them to different extents. 相似文献
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用粉末烧结法制备出了开孔型多孔铝及以Al2O3为增强相的铝基多孔复合材料,材料相对密度及孔径分别在0.25~0.40和100~400 μm范围内变化.对这两种多孔材料的压缩行为进行了研究.结果表明:Al/Al2O3复合材料有着比多孔铝更为有利的响应特征和更高的流动应力,该复合材料的压缩应力-应变曲线较为平坦,在与多孔铝相对密度相近时,屈服强度提高40%以上;经T6热处理,Al/Al2O3复合材料的屈服强度可进一步提高35%左右;此外,该复合材料的压缩行为具有明显的孔径依赖性,随孔径增大,流动应力升高,这主要与烧结过程中孔表面残留的气体有关. 相似文献
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胞状纯铝与胞状铝合金的准静态压缩性能 总被引:2,自引:1,他引:2
测量分析了新型轻质、高强度胞状铝合金(ZL111)和胞状纯铝的压缩应力应变σ-ε曲线。结果表明:胞状铝合金的压缩屈服强度以比胞状纯铝高40%以上,其σ-ε曲线呈锯齿状,平台斜率dσ/dε比后者小;胞状铝合金的能量吸收效率峰值和峰宽均大于胞状纯铝,表明胞状铝合金是一种更为优秀的吸能材料。提出了确定泡沫金属材料致密化起始点εD的方法。 相似文献
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Zhang Libin 《机械工程学报(英文版)》2001,(4):370-372
[1]Zhang Libin,Hai JintaoPlastic working and superplasticity in aluminummatrix composites reinforced with SiC particulatesJournal of Materi als Processing Technology,1998,84∶271~273
[2]Zhang Libing, Hai Jintao Metal matrix momposites in ChinaJ ournal of Materials Processing Technology,1998,75∶1~5
[3]Wei ZhengResearch on superplasticity of IM SiCp/2024 composi tes∶[Master Dissertation]Beijing Research Institute of Mechanical and Elect rical Technology,1990 相似文献
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硼酸铝晶须的优良特性,使人们逐渐开始认识到硼酸铝的价值,在金属基复合材料中的应用也越来越广泛.介绍了硼酸铝晶须增强铝基复合材料的研究现状,对其制取方式作了简要说明,并指出了进一步研究中需要解决的问题. 相似文献
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Wear behavior of nanostructured Al6061 alloy and Al6061–Al2O3 nanocomposites produced by milling and hot consolidation were investigated. The samples were characterized by hardness test, pin-on-disk wear test, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Nanocomposites containing 3 vol% Al2O3 showed a maximum hardness of 235 HV and optimum wear rate of 4×10−3 mg/m. Increasing the amount of Al2O3 up to 5 vol% resulted in decrease in hardness values (∼112 HV) and a sharp rise in wear rate (∼18×10−3 mg/m). 相似文献
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采用不同加热加载方法对机械合金化Al3Ti/Al合金的使用环境进行了模拟试验研究,考察了该合金显微组织高温稳定性。结果表明,机械合金显微组织高温稳定性。结果表明,机械合金化Al3Ti/Al合金具有细小的晶粒组织(约为0.5μm),经过各种高温变形后合金组织并未粗化,具有很好的高温稳定性。该合金在350℃下的压缩屈服强度仍能保持在247MPa。 相似文献
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在电磁搅拌条件下,通过Al-Zr(CO3)2熔体原位反应法,合成了Al2O3、Al3Zr颗粒增强铝基复合材料,对材料的组织和性能进行了研究。结果表明:由于电磁搅拌能促进铝热反应固液两相的传质和扩散,改善了原位合成动力学条件,采用电磁搅拌合成的复合材料中增强相颗粒在基体中的体积分数和弥散度都较未施加电磁搅拌时有了明显提高,浇注缺陷明显减少,铝基体得到净化;当Zr(CO3)2加入量为20%时,所获复合材料抗拉强度达202.6MPa,较未施加电磁搅拌的强度提高了34.8%。 相似文献