共查询到19条相似文献,搜索用时 171 毫秒
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高铝锌基合金粉末冶金材料及其摩擦学特性初探 总被引:8,自引:2,他引:8
初步研究了高铝锌基合金的粉末冶金工艺及其材料的摩擦磨损性能。通过气喷气冷法制取合金粉末,用压制后真空烧结的方法制备高铝锌基合金粉末冶金材料。实验结果表明,高铝锌基合金的粉末冶金试样在干摩擦和油润滑条件下的磨损率及摩擦系数均小于同一合金的铸造试样,但其压溃强度有待提高。在实验的基础上还探讨了该材料的耐磨减摩机理 相似文献
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通过对高铝锌基合金的强度、硬度、韧性、密度、耐磨性、可加工性、性价比等进行分析,提出了高铝锌基合金轴套在WK-4电铲行走部位上应用的可行性.通过现场装机试验表明,高铝锌基合金具有比铜合金优良的使用性能,以及较高的性价比. 相似文献
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高铝锌基合金(30%—45%Al)耐磨性能的研究 总被引:5,自引:0,他引:5
研究了铝含量分别为30%、40%、45%的锌基合金在不同状态下的耐磨性能,试验结果表明:在保证铸件良好健全度的前提下,这些锌基合金的耐磨性能明显优于锡青铜ZCuSn6Zn6Pb3和铝青铜ZCuAl9Fe4;适当的铸态时效可以提高高铝锌基合金的耐磨性。此外,还分析了铸件健全度对耐磨性能的影响,并对高铝锌基合金的耐磨机理作了初步的探讨。 相似文献
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Microstructure and mechanical properties of AZ81 magnesium alloy with Y and Nd elements 总被引:2,自引:0,他引:2
The effects of rare earth(RE) elements Y and Nd (w(Y)/w(Nd)=3:2) with total content of 1%-4% on microstructures and elevated temperature mechanical properties of AZ81 magnesium alloy were investigated. The results show that, proper content of rare earth elements makes the microstructures of AZ81 magnesium alloy refine obviously and the quantity offl-MglTAll2 phases reduce, and Al2Y and Al2Nd form. After solid solution treatment, with increasing content of rare earth elements, the tensile strength and elongation of the alloys (at room temperature, 150 ℃ and 250 ℃) increase first, then decrease. When the content of rare earth elements is up to 2%, the values of tensile strength at room temperature and 150 ℃ are up to their maxima simultaneously, 282 MPa and 212 MPa, respectively. Meanwhile, the values of elongation at room temperature and at elevated temperature are also up to their maxima, 13% and 15%, respectively. 相似文献
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《Intermetallics》2007,15(5-6):727-733
The effects of rare earth elements (REEs) (like Y, Ce, Nd and Dy) on the microstructure and mechanical properties of cast NiAl–28Cr–5.5Mo–0.5Hf alloy were investigated. The results suggest that the microstructure of REEs-doped alloys gradually refines with increasing REEs addition and the appropriate addition of REEs can improve the compressive ductility and yield strength at room temperature. In addition, REEs additions increase the elevated temperature strength and deformation ability of the alloys. The elevated temperature compression deformation behavior of Nd-doped alloy can be properly described by power-law equation. 相似文献
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目的提高超高强度钢耐海洋大气腐蚀的性能。方法采用周期浸润腐蚀试验箱模拟一般条件下海洋大气腐蚀试验,通过金相显微镜和扫描电子显微镜观察低合金超高强度钢的组织和夹杂物的形貌,采用失重法和电化学阻抗技术分析腐蚀动力学规律及电化学行为规律。结果稀土在低合金超高强度钢中具有细化组织和变质夹杂物的作用,稀土增强了锈层的致密性,使得低合金超高强度钢的耐蚀性能显著提高,且随着稀土含量的增加,锈层电阻值逐渐增大,即稀土提高了锈层对基体的保护能力。结论在低合金超高强度钢中添加稀土能够细化组织、变质夹杂物。稀土低合金超高强度钢的夹杂物主要为球形稀土复合氧硫化物。稀土质量分数为0.08%的低合金超高强度钢的耐腐蚀性能最好。 相似文献
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稀土元素对高强高导铝合金的性能影响 总被引:6,自引:0,他引:6
通过在纯铝中添加混合稀土(La和Ce),研究稀土元素对高强高导铝合金性能的影响和作用机理。按照国家标准测试了试验样品的电阻率和拉伸强度,利用扫描电镜观察了样品的显微组织和化合物的分布,并用能谱对这些化合物进行分析,最后用材料科学基础和金属电子论分别解释了混合稀土对铝合金强度和电阻率的作用。结果表明:混合稀土可以净化晶粒和细化晶粒;加入0.1%~0.4%(质量)混合稀土可以在电阻率增高不大的情况下大幅提高其强度;在≥0.5%(质量)时,材料的电阻率大幅度提高,其强度反而急剧下降。 相似文献
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In this paper, the brazing mechanism of LY12 aluminum alloy at middle range temperature was presented. The CsF-AlF3 non-corrosive flux was utilized to remove the complex oxide film on the surface of LY12 aluminum alloy. The resultsrevealed that the oxide film was removed by the improved CsF-AlF3 flux accompanied with the occurrence of reaction as well as dissolution and the compounds CsF played an important role to remove the oxide film. Actually, the high activity of flux, say,the ability to remove the oxide film, was due to the presence of the compounds, such as NH4F,NH4AlF4 and composite molten salt. The production of HF was the key issue to accelerate the reaction and enhance to eliminate the oxide film by dissolution.It was found that the rare earth element La at small percentage was not enriched at the interface. Moreover, the rare earth fluoride enhanced the dissolution behavior. 相似文献
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The improvements of microstructures and properties of a high strength aluminum cast alloy were studied.The effects of rare earth elements on the microstructures and mechanical properties of the high strength cast alloy Al-Cu-Mg-Si were investigated.The result shows that the addition of rare earth elements can change the microstructures in refining the grain size of the alloy and making the needle-like and laminar eutectic Si to a granular Si.With the increase of the rare earth, the tensile strength and elongation of the alloy increase first and then fall down.The mechanical properties of the alloy will reach the highest value when the content of rare earth elements is about 0.7%. 相似文献
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采用120~130Hz的频率测试Ti-600合金光滑试样室温高周轴向应力疲劳性能。结果表明,应力比(R)为0.1时,合金的疲劳强度为475MPa,与IMI834合金相当;合金内含有较细小、薄片状的、互相交错排列的α+β相,这种细小的α+β相间的层状组织对于阻止疲劳裂纹的扩展和提高疲劳裂纹寿命有重要作用;疲劳裂纹扩展阶段,应力同为600MPa时,疲劳寿命为8.61×105的合金试样比寿命为1.78×106的疲劳条纹间距宽;合金内稀土相的尺寸由几个μm到0.2μm变化,合金中未观察到与稀土相颗粒有关的裂纹萌生。 相似文献