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. The grain refining of surface layers and the reduced stress concentration at weld toe are main factors which improve the mechanical properties of MB8 magnesium alloy welded joints. Key words: ultrasonic impact; welded joint; surface microstructure; tensile strength; grain refining Foundation item: Project(51265013) supported by the National Natural Science Foundation of China; Project......
practice for refining microstructure and elevating the mechanical properties of magnesium alloys. It is an essential and fundamental approach, since grain size significantly influences the mechanical... inoculation process is a practical method as one of the grain refinement processes. Carbon powder, Al4C3, C2Cl6 and other compounds containing carbon were used for refining the grain and improving mechanical......
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process and the corrosion resistance of NC Ni decreases with refining grain size. The distinct experimental results of NC Ni in corrosion behavior can be reasonably explained by the positive... A/dm2 and pH 5.0. The anode was pure Ni plate and the cathode was a steel sheet (C1008, AISI). The saccharin was added as a grain-refining agent during the deposition. Four Ni samples with different......
and the melt is agitated for 3-5 min, the grain size becomes smaller, which indicates that the carbon powders have effect on refining the grain. Within 20 min, the grain size decreases with the holding... grain remelted only. It is widely accepted that the aluminum carbide (Al4C3) is the compound largely responsible for AZ91D alloy refining effects[3, 16-17], as the heterogeneous nucleation particle......
alloy are markedly improved by 0.5 wt pct Y. The refining mechanism of Y on the morphology and the grain size of the primary α-Al in semi-solid Al7Si0.3Mg alloy are delved.关键词:...Refining mechanism of yttrium on primary α-Al in semi-solid Al alloyZheng LIU 1,2), Yongmei HU 2,3) and Xiaomei LIU 1) 1) Faculty of Mechanical and Electronic Engineering, Jiangxi University......
and prospects of ECAP were presented. Key words: ECAP; pure-shear deformation; grain refinement; refining mechanism; influence factors 钛性能优良,储量丰富,且具有两个最为显著的优点:比强度高和耐腐蚀性好,因此,钛及钛合金在航空,航天,舰船,兵器,核能等领域有着广泛用途. 等通... by pure-shear deformation, which can effectively refine the grain of alloy and obtain ultra-fine grained materials with high strength and excellent superplasticity. An overview of the grain refinement......
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to study the formation of grain refining structure with ultrasonic stirring. The cooling curves of ingots with ultrasonic were measured and compared with those without ultrasonic. At the same time, the effect of the time of ultrasonic stirring on solidification structure of ingots was investigated. The influence of ultrasonic on the grain-refining efficiency of ingots was analyzed. In order to well......
