共查询到18条相似文献,搜索用时 250 毫秒
1.
在Al-22Si-Zr(CO3)2体系中,用熔体原位反应法制备了内生Al2O3和Al3Zr颗粒增强铝基复合材料,用XRD、EPMA、SEM等方法对复合材料进行物相和显微组织分析;用磨损试验机测试了复合材料的室温干滑动摩擦磨损性能,并对其磨损机制进行了分析。结果表明:复合材料的磨损性能比基体合金有显著提高,随着内生Al2O3和Al3Zr颗粒体积分数的增加,复合材料的耐磨性能逐渐提高;随载荷增加,复合材料的摩擦因数呈降低趋势,且颗粒体积分数越大,摩擦因数越低;随颗粒体积分数的增大,复合材料的磨损机制由粘着磨损+磨粒磨损向磨粒磨损转变。 相似文献
2.
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
3.
4.
5.
6.
采用搅拌摩擦加工法进行了原位合成Al-Ti金属间化合物颗粒增强铝基复合材料的试验,研究了复合材料的微观组织和精细结构。结果表明,以纯Ti粉和纯铝板为原材料,采用搅拌摩擦加工的方法可以原位合成TiAl3金属间化合物颗粒增强铝基复合材料。在复合材料铝基体上,除了生成的TiAl3金属间化合物外,还存在一些纯Ti颗粒以及纯铝基体上的固溶体。经旋转摩擦挤压后,纯铝基体的晶粒得到细化,尺寸为200nm左右,生成的TiAl3晶粒尺寸约为200~300nm。 相似文献
7.
8.
在对Al-KBF4—K2TiF6-Na3AlF6反应体系进行热力学分析的基础上,用混合盐反应法原位合成了TiB2p/Al-10Sn复合材料;用XRD、SEM、硬度仪等对复合材料的物相组成、显微组织和硬度进行了分析。结果表明:该复合材料主要由α—Al、β-Sn和TiB2三相组成;内生的TiB2颗粒细小(0.8~1.5um),并弥散分布在基体α—Al晶内;在α—Al与共晶β-Sn的交界处出现颗粒团聚,并形成锡包TiB2颗粒组织;与Al—10Sn基体合金相比,复合材料的硬度显著提高。 相似文献
9.
不同铝基体SiC_p/Al复合材料切削力与刀具的磨损研究 总被引:1,自引:0,他引:1
对不同增强相体分比、颗粒尺寸和基体材料的Si CP/Al复合材料进行切削试验,分析了铝基体材料和颗粒尺寸对高、低增强相体分比Si C_p/Al复合材料切削力的影响。针对Si C_p/Al复合材料切削力的复杂性,提出用分形维数的方法定量描述切削力波动的复杂程度。对不同铝基体Si C_p/Al复合材料进行刀具磨损试验,研究铝基体对刀具磨损的影响。结果表明:随着增强相体分比和颗粒尺寸的增加,铝基体对切削力的影响减弱;随着增强相体分比增加,颗粒尺寸对于切削力影响有增大趋势;分形维数可以定量描述切削力波动性质,且Si C_p/6063Al切削力波动频率高于Si C_p/2024Al;相对于Si C_p/2024Al,切削Si C_p/6063Al时刀具前刀面粘结磨损加剧而颗粒磨损减少,刀具后刀面磨损程度相对较高。 相似文献
10.
复合材料高强度和高塑性不可兼得的难题限制了其广泛的运用,因此如何制备高强度和高塑性的复合材料是使其具有更广泛运用的关键.采用高能球磨和真空热压烧结技术制备不同体积分数纳米Al2 O3颗粒增强铝基复合材料.采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)等方法对复合材料的微观结构进行分析,通过准静态压缩测试复合材料的力学性能,并对复合材料的失效方式进行了初步分析.研究结果表明纳米Al2 O3颗粒在铝基体中分散均匀,没有发生团聚现象.随着纳米Al2 O3颗粒体积分数的增加复合材料的强度提升明显,其中15vol.%-Al2 O3/Al复合材料的最大压缩强度达到741 MPa,同时具有23.5%的失效应变,复合材料的失效方式也由脆性-韧性混合断裂转变为脆性断裂.研究结果对铝基复合材料的研究以及工业运用具有一定的参考价值. 相似文献
11.
The effects of volume fraction and size of SiCrFe, CrFeC, and Al2O3 particulates on the abrasive wear rate of compo-casted Al2024 metal matrix composites (MMCs) were studied. The process variables like the stirring speed, position and the diameter of the stirrer have affected the diffusion between particulates and matrix.The abrasive wear rate was decreased by the increase in particulate volume fraction of SiCrFe and CrFeC intermetallic reinforced composites over 80 grade SiC abrasive paper. The wear rates of the all composites decreased with aging treatment, and the best result was seen for the composite having a hybrite structure as SiCrFe and CrFeC particulates together. Nevertheless, the fabrication of composites containing soft particles as copper favors a reduction in the friction coefficient. 相似文献
12.
13.
14.
A dispersion of TiB2 particulates in an Al alloy matrix was formed via the in-situ reaction between mixtures of K2 TiF6 (K2 ZrF6 ), KBF4 and molten aluminium. The dispersion of the ceramic phase in the aluminium matrix was also achieved in some experiments by adding exogenous TiB2 particles to the fluoride melt in contact with molten aluminium.
In this work, we have examined the microstructure of the as-cast metal matrix composites using analytical electron microscopy and X-ray diffraction techniques. The phases formed as a result of the reaction between the molten fluoride flux and liquid aluminium have been identified. These were (Ti, Zr, Al)B2 , Al3 Ti and possibly AlB12 in the Al-matrix, and KAlF4 and KMgF3 in the solidified flux. The mechanism of formation of TiB2 and Al3 Ti is explained. The role of alloying elements is also explained in the context of interfacial chemistry and dispersion. 相似文献
In this work, we have examined the microstructure of the as-cast metal matrix composites using analytical electron microscopy and X-ray diffraction techniques. The phases formed as a result of the reaction between the molten fluoride flux and liquid aluminium have been identified. These were (Ti, Zr, Al)B
15.
采用Mg-TiO2-B2O3体系热爆方法制备了原位颗粒增强镁基复合材料,并对材料进行了热力学、DTA、XRD和SEM分析。结果表明:在Mg-TiO2-B2O3体系中镁的加入量小于70%(质量分数)的情况下,体系的热爆反应可以在镁液的冶炼温度自发进行,同时可原位合成MgO和TiB2颗粒。5%Mg-TiO2-B2O3体系制备的镁基复合材料的抗拉强度和布氏硬度分别比基体提高了约26%和32%。 相似文献
16.
17.
T. W. Kim S. M. Lee C. G. Kang B. M. Kim 《The International Journal of Advanced Manufacturing Technology》2009,40(3-4):242-252
A rheological forging process to fabricate engineering components of A6061 wrought aluminum alloy with a controlled liquid fraction has been proposed and mechanical properties of the products characterized. The process uses a medium pressure of below 45 MPa and electromagnetic stirring (EMS). The processing parameters such as injection velocity, injection pressure, and stirring time were optimized to obtain improved mechanical properties. It was also possible to determine injection time and stirring time by measuring the temperature of molten metal in the sleeve. After the products were manufactured by using EMS, their microstructure and mechanical properties were investigated by image analysis, comparing to parts produced without EMS. Those products fabricated by EMS had better mechanical properties and had over 20% higher globular microstructures than those fabricated without EMS. 相似文献