排序方式: 共有46条查询结果,搜索用时 0 毫秒
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采用光学显微镜和扫描电子显微镜(SEM)对半固态方法制备的Al-20Sn-1Cu轴承合金的微观组织进行了分析.结果表明,Al-20Sn-1Cu轴承合金材料具有非常细小和均匀的组织.在铸件的整个断面上没有发现粗大的树枝Sn相和Sn相的偏聚.相组成主要由初生a-Al相、二次a-Al相和共晶Sn相组成.球形的初生a-Al相尺寸约为50μm.细小的共晶Sn相以连续的方式均匀地分布在晶界处,形成网状结构,该网状结构经后续的热处理变为细小弥散的Sn颗粒. 相似文献
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Effect of rod-like grain on properties and toughening mechanism of 3Y-TZP/Al2O3 ceramics 总被引:1,自引:0,他引:1
In-situ rod-like A1203 grain was prepared by adding CAS multiphase additives under the sintering condition of 30 MPa, 1 550℃ and 1 h. The sintering behaviors, microstructure, toughening mechanism and access of Al2O3 ceramics were investigated by SEM, EDS and WDW omnipotent electronic mechanical testing machine, etc, and the crack propagating model of cylindrical crystal/3Y-TZP composite toughening Al2O3 ceramics was established. The results show that the composite additives prompt the anisotropic growth of Al2O3 grain, which strengthens toughening effect of 3Y-TZP in 3Y-TZP/Al2O3 composite ceramics. Moreover, the experimental material density is near to theoretical density, bending strength is 556.35 MPa, and fracture toughness is 6.73 MPa.m1/2. The mechanical properties of the materials are obviously improved. 相似文献
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高碳低合金贝氏体抗磨钢的研制与应用 总被引:1,自引:0,他引:1
在含碳0.7-1.4%的钢另,采用多元素微量合经,提高其淬透性,经等温热处理后,可获得贝氏体与马氏体基体加弥散分布碳化物、由于贝氏体细化分割了马氏体,使试验钢具有优良的韧性,而且硬度可达到HRC55-61。在水泥球磨机与电厂球磨机中使用,显示出优良的抗磨性。 相似文献
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