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University摘 要:This work discusses tribological properties of commercial pure(CP)titanium processed by multi-directional forging(MDF)up to six passes at room...Tribological Characterization of Commercial Pure Titanium Processed by Multi-Directional ForgingI.Ansarian,M.H.Shaeri,M.Ebrahimi,P.MinárikDepartment of Materials Science and Engineering, Imam......
Grain size and texture changes of magnesium alloy AZ31 during multi-directional forging YANG Xu-yue(杨续跃)1, 2, SUN Zheng-yan(孙争艳)1, XING Jie3, MIURA Hiromi3, SAKAI Taku3 1...): 681-686. [5] XING J, SOHDE H, YANG X, MIURA H, SAKAI T. Ultra-fine grain development in magnesium alloy AZ31 during multi-directional forging under decreasing temperature conditions [J]. Mater Trans, 2005......
样品放入保温炉中(炉温设定为实验温度)保温10 min,变形完成后在1.5 s内取出样品进行水淬.第1道次变形温度为623 K,随后各道次变形温度依次降低,图1(b)给出了具体工艺曲线. 图1 镁合金降温多向压缩示意图和工艺曲线 Fig. 1 Schematic diagram of multi directional forging (MDF) (Each pass...): 129-134. YANG Xu-yue, SUN Huan, WU Xin-xing, MA Ji-jun, QIN Jia, HUO Qing-huan. Evolutions of microstructure and microtexture in AZ21 Mg alloy during multi-directional forging under decreasing temperature......
Dynamic and Static Aging Precipitation of β-Mg17Al12 in the AZ80 Magnesium Alloy During Multi-directional Forging and Subsequent AgingQing-Feng Zhu1,2,Gao-Song Wang1,2,En-Ge Zhang1,2,Fan-Zheng...,Northeastern University摘 要:Dynamic and static aging precipitation of Mg17Al12 phases in AZ80 magnesium alloy was studied by multidirectional forging(MDF......
parameters of multi-directional forging 2 实验结果 2.1 铸态组织 图2所示为本实验所用高纯铜(≥99.99%)铸锭的宏观组织,由图2可以看出,其铸态组织为粗大且不均匀的柱状晶,晶粒在铸锭边部形核向心部生长,并在铸锭心部汇合,部分粗大晶粒的长度可以达到铸锭半径的一半. 2.2 多向锻后试样的形貌 经6道次锻造获得的不同终锻温度...有氧化皮.通过对锻造过程观察分析可知,铜在高温变形时容易与空气中的氧反应生产氧化皮,这些塑性差的氧化皮在变形过程中会脱落,当终锻温度高时,变形完成后试样表面会继续被氧化形成的氧化皮层;当终锻温度低时,试样表面则不易被继续氧化. 图1 多向锻造过程示意图 Fig. 1 Schematic diagram of multi-directional forging 图2......
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Trans. Nonferrous Met. Soc. China 24(2014) 1301-1306 Structure uniformity and limits of grain refinement of high purity aluminum during multi-directional forging process at room temperature Qing-feng... decreased with increasing the forging passes to 24. Key words: multi-directional forging; high purity aluminum; structure uniformity; grain refinement 1 Introduction Ultra-fine grain (UFG) material......
passes of multi-directional forging. Then, the samples were non-isothermally annealed up to 150, 200, 250, 300 and 350 °C. The evolution of dislocation density and flow stress was studied via modeling... is the source of discrepancy between the modeling and experimental flow stress. Key words: severe plastic deformation; multi-directional forging; non-isothermal annealing; dislocation density-based model......
剧烈塑性变形(Severe plastic deformation, SPD)使晶粒细化能有效提高材料的综合性能.因此,SPD技术成为获取性能优异的轻质高强材料的有效途径之一[4].多向锻造(Multi-directional forging, MDF)技术作为SPD技术的一种代表性工艺[5],其实质是对材料3个轴向反复镦粗,拔长,引入大的塑性变形,达到细化晶粒,提高性能的目的.该技术具有工艺简单,成本低,易于实现等优点,被广泛应用于钛合金组织改善过程中[6-7]. SALISHCHEV等[8]通过MDF技术制备出晶粒尺寸为135 nm的Ti-6Al-4V合金,并对其低温超塑性进行了研究.ZHEREBTSOV等[9]对大尺寸坯料Ti-6Al-4V合金进行多向等温锻造(Multi-directional isothermal forging,MDIF),获得了尺寸约为0.4 μm的均匀细晶组......
multi-directional impact forging(MDIF) was applied to a solutionized Mg-Gd-Y-Zr alloy in the temperature range of 350-500℃.Results demonstrate that the dominant deformation mode is twinning...Temperature Effects on the Microstructures of Mg-Gd-Y Alloy Processed by Multi-direction Impact ForgingS.S.A.Shah1,2,D.Wu2,R.S.Chen2,G.S.Song11. School of Material Science and Engineering,Anhui......