共查询到19条相似文献,搜索用时 93 毫秒
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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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采用电磁搅拌方法,向Al熔体中加入AlNH4(SO4)2,反应生成了Al2O3颗粒,成功制备了Al2O3/Al复合材料.采用此方法制备复合材料成本低、工艺简单.试验结果表明,生成的Al2O3颗粒小,均匀分布在Al基体上,具有显著的增强效果,复合材料的硬度远高于基体材料. 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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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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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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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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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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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