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: A binary Al-7Mg alloy was processed by equal channel angular pressing (ECAP) at room temperature via route Bc, combined with intermediate annealing. After 6 passes, a high hardness of 218 HV is achieved... is neglected. The high hardness of the 6 pass-treated materials comes mainly from grain boundary strengthening, which contributes about 41% to the total strength, while dislocations and Mg solid solution......
investigated. The steel possesses high hardness of 621 HV, high yield strength of 1437 MPa and good fracture toughness at room temperature. The yield strengths are still above 600 MPa at 600?C.The... and wear rate in a magnitude of 10-6 mm3/N·m below 600?C. The good tribological properties of the steels were mainly attributed to the high hardness, lubrication of graphite and stable surface oxide......
RESEARCH ON CHEMICAL COMPOSITION AND MICROSTRUCTURE OF NEWLY-DEVELOPED HIGH STRENGTH AND HIGH ELONGATION STEELS S.K.Pu1,B.F.Xu2,D.X.Luo1,X.Chen1,Z.X.Yuan2,A.M.Guo1,Y.Chen2,S.B.Zhou1,P.H.Li1...) Abstract:The different chemical composition of silicon and manganese as well as different re-tained austenite fraction ranged from 4% to 10% of the high strength and high elon-gation steels were......
Compression Molded Ultra High Molecular Weight Polyethylene-Hydroxyapatite-Aluminum Oxide-Carbon Nanotube Hybrid Composites for Hard Tissue ReplacementAnkur Gupta1,Garima Tripathi1,Debrupa... University,Miami,FL 33174,USA摘 要:<正>Ultra high molecular weight polyethylene(UHMWPE) is widely used for articulating surfaces in total hip and knee......
Microstructure and Mechanical Properties of a CoFeNi2V0.5Nb0.75 Eutectic High Entropy Alloy in As-cast and Heat-treated ConditionsLi Jiang1,Yiping Lu1,2,Wei Wu1,Zhiqiang Cao1,Tingju Li11. School...="ChDivSummary">The eutectic CoFeNi2V0.5Nb0.75 high entropy alloys(HEAs) were heated at 500, 600, 700, 800 and 1000 ℃,respectively for 6 h and subsequently quenched in the water to investigate their thermal......
. As the strain increases, the subgrains near the original grain boundary start to evolve into high angle grain boundary. 3.2 Hardness variation Fig.6 shows the microhardness variation along the depth... Microstructure evolution of AZ91D induced by high energy shot peening HOU Li-feng(侯利锋)1, 2, WEI Ying-hui(卫英慧)1, 2, LIU Bao-sheng(刘宝胜)2, XU Bing-she(许并社)1, 2 1. College of Materials Science......
are composed of highly dispersed α-Fe and γ-Fe4N, with both of them maintaining nanometer scale. The micro-hardness of them can be as high as900HV. 关键词:high nitrogen austenite; mediate temperature...Research on Mediate Temperature Decomposition of High Nitrogen Austenite HU Ming-juan1,LI Xiao-ling1,BEI Duo-hui1,ZHU Zu-chang1 (1.School of Material Science and Engineering, Shanghai Jiao Tong......
Fracture behavior of high strength Mg-Gd-Y-Zr magnesium alloy GAO Lei(高 磊)1 ,2, CHEN Rong-shi(陈荣石)1, HAN En-hou(韩恩厚)1 1. State Key Laboratory for Corrosion and Protection, Institute of Metal... in the peak-aged sample tested at 300 ?C, corresponding to the intergranular fracture. Localized plastic deformation at grain boundaries is also observed and corresponds to the high elongation at 300 ?C......
Effect of inclusion size on the high cycle fatigue strength and failure mode of a high V alloyed powder metallurgy tool steelJun Yao, Xuan-hui Qu, Xin-bo He, and Lin Zhang State Key Laboratory... strength of a high V alloyed powder metallurgy tool steel with two different inclusion size levels, tempered at different temperatures, was investigated by a series of high cycle fatigue tests......
Preparation and Properties of Ultra-fine Chromium Carbonization of High Performance Mechanical Activation田磊1,2,CHEN Lijie1,张廷安2,Lü Guozhi2,LIU Yan2,ZHANG Ying21. School of Metallurgical and Chemical... hydroxyl chromium as the raw material, a direct reduction and carburization process was used to prepare ultra-fine chromium carbonization. Through SEM and XRD, the high performance mechanical activation......
