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phases in different thicknesses of Al-Si samples were investigated. The results show that the size distributions of β phases obey the logarithmic normal distribution. The Brinell hardness tests were also carried out. The tested hardness results show that the hardness distribution of the casting cooled in water is evener than that cooled in air, and its averaged value is higher than that cooled in air......
TRIBOLOGICAL AND HIGH SPEED TURNING PERFORMANCE IN Ti1-xAlxN COATINGS PREPARED BY CLOSE-FIELD UNBALANCED MAGNETRON SPUTTERING Y.G. Shen1,Z.F. Zhou1,T.H. Wong1,K.Y. Li1,M. Escursell1,P.W. Shum1... by sliding against steel and WC-6wt%Co balls, while the turning performance was evaluated by a conventional turning machine at high cutting speeds without using coolants. In the tribological tests......
Effects of solution treatment on grain coarsening and hardness of laser welds in UNS N10003 alloy contained different carbon contentKun Yu1,2,Xianwu Shi1,2,Zhenguo Jiang3,Chaowen Li1,Shuangjian... and Joining,Harbin Institute of Technology摘 要:Microstructure and microhardness evolution of laser welds in low carbon UNS N10003 alloy(LC alloy)and high carbon UNS......
理后,合金的固溶程度提高,时效驱动力因此增加,时效析出细小弥散分布的第二相能够有效强化合金[22]. 图6 不同固溶工艺处理后合金120 ℃时效24 h的硬度 Fig. 6 Hardness of alloys at different solution treatments after aging at 120 ℃ for 24 h 7xxx铝合金为时效强化铝合金,其强...淬火敏感性,实验合金较好的双级固溶工艺为(450 ℃,0.5 h)+(490 ℃,0.5 h),对再结晶抑制效果最佳,淬火后过饱和程度最高. REFERENCES [1] 杨守杰, 杨 霞. 高强度铝合金的研究进展[J]. 粉末冶金工程, 2010, 20(5): 47-52. Yang Shou-jie, YANG Xia. Progress in high-strength aluminum......
deposited on WC-Co cemented carbides by cathode arc evaporation and then annealed at 900℃ in vacuum for 0.5-4h. X-ray diffraction (XRD) and Vickers hardness tester were used to study the effect of Al content on the structure, hardness and thermal stability of TiAlN coatings. The results show Ti0.5Al0.5N and Ti0.45Al0.55N exhibit single-phase face-centered cubic structure, while Ti0.4Al0.6N......
at periodic bias is of smoother surface with roughness of 0.1nm, high sp3 content of 66.8%, and higher hardness of 80GPa. The mechanism for depositing the DLC films was also discussed in detail. Key words: periodic bias; high-quality DLC films; magnetic filtered plasma; hardness 类金刚石膜(DLC)为非晶硬碳膜, 由无定形碳, 石墨, 金刚石组成, 为sp1, sp2和sp3键共存[1-3]. 它在硬度, 电学性能, 光学性能及化学稳定性等方面与金刚石类似, 而制备技术较金刚石膜简单且要求的条件也较低. 因此, 近年来倍受关......
lubricant retained between the sliding surfaces, then well mitigating the wear process. In addition, the HVAS 321/Al coating has a relatively low mean hardness and high friction coefficient under... such as moderate hardness but high wear resistance and chemical stability. References [1] SAN Jin-fu, DU Zhi, BI Zhi-fu. Study on the wear resistance of arc spray stainless steel coating [J]. Tribology, 1998......
to the hardness and proportional to the normal load. In addition, compared with Cu-15Ni-8Sn alloy, Cu-15Ni-8Sn-0.2P alloy has better wear resistance under high load, and the minimum friction coefficient is 0.65... Cu-15Ni-8Sn合金和Cu-15Ni-8Sn-0.2P合金400 ℃时效不同时间的硬度曲线 Fig. 1 Hardness curves of Cu-15Ni-8Sn and Cu-15Ni-8Sn-0.2P alloys aged at 400 ℃ for different time 图2所示分别为70%冷轧后Cu-15Ni-8Sn合金和Cu-15Ni-8Sn-0.2P合......
High temperature oxidation resistance of plasma sprayed NiCrAl+(ZrO2+Y2O3) gradated coating on stainless steel surface CHEN Fei(陈 飞)1, 2, ZHOU Hai(周 海)1, L? Tao(吕 涛)1 1... by the plasma spraying technique. The phase structure and morphology of the gradated coating were analyzed by means of X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The high temperature......
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