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that of the SC sample. With the same forming process, the UTS of Al-14Si-2Fe-0.8Mn alloy is higher than that of Al-14Si-2Fe-0.4Mn alloy. Key words: high pressure; manganese; rheo-squeeze casting...%Mn under the same forming process. For example, with SC and under the pressure of 0, 100, 200 and 300 MPa, the UTS of M2 alloy is increased by 8.9%, 12.6%, 9.5% and 14.7%, respectively, compared......
ductile and brittle samples has been reflected on the fracture surfaces. The higher the plastic strain was, the higher the density of shear bands forming during deformation manifested by a serration... BMGs due to their high glass-forming ability at a relatively low cost of constituent elements. It is well known that Zr-based BMGs possess a high elastic limit, high strength and hardness, as well......
forming sequences 2.3 拉伸性能分析 水平布置成形时,A型结构在成形过程中从多孔层和下致密层界面处发生翘曲开裂,无法成形出拉伸样,故只对B,C型梯度结构和致密试样进行拉伸性能试验,性能测试结果如图12所示,B型结构抗拉强度可以达到979.1 MPa,与铸造钛合金相当,伸长率为4.54%,低于打印态的致密Ti-6Al-4V合金性能.结构C的拉伸性能和致密Ti-6Al-4V... manufactured by selective laser melting HUANG Chuan-shou1, XIAO Zhi-yu1, WANG Zhen1, HUANG Jia-hao2, ZHU Quan-li1 (1. National Engineering Research Center of Near-Net-Shape Forming for Metallic......
at a high anodic over-potential. Thus, different corrosion resistances of the two Mg systems are ascribed to various protective films forming on their surfaces. Key words: Mg-Li alloy; corrosion resistance...-sectional (c, d) morphologies and Raman analysis (e, f) of surface film on pure Mg (a, c, e) and Mg-14Li alloy (b, d, f) exposed to 0.1 mol/L NaCl for 8 h The surface film forming dynamically......
is of great significance to the stability of cast-rolling forming. Key words: bimetal clad strip; solid-liquid cast-rolling bonding; rolling force calculation model; kiss point; thermal-flow coupled simulation 1 Introduction Solid-liquid cast-rolling bonding for fabricating bimetal clad strips is a near-end forming process, which is a new short-flow, energy-saving, and highly efficient technology......
properties and anodic oxidation effect. Laser engineered net shaping technology has unique advantages in the integrated forming of high-performance large aircraft structural parts. The manufacturing..., and the molten material rapidly cools and solidifies layer by layer, eventually forming a three-dimensional component. Aluminum alloy structural components are required to have not only good......
junctions forming LABs dissociate at high extrusion ratios from the external stress (>981 MPa) with thermal activation by the generated heat. The correlation between grain size and Vickers hardness... forming LABs dissociate when the external stress reaches 981 MPa. In the present study, the external stress for hydrostatically extruding the Nb tubes was increased from 629 to 998 MPa by increasing......
of internal pressure on forming defects, corner radius and thickness distribution of 5A02 aluminum alloy shear hydro-bending tubes were studied by experiment. Numerical simulation was conducted... was proposed to solve the problem of forming ultra-small bending radius tube [14]. Differing from the traditional bending process of tensile-compressive deformation mechanism, shear deformation is employed......
forming technique. Completely filled die cavity and good microstructure of the part show that applied process parameters were properly selected. Key words: thixoforming; globular microstructure......
. The effects of the portholes configuration scheme on the metal flowing behaviors, extrusion load, tube temperature and forming quality were analyzed. The results show that, the area ratio of the center... of 24.8mm) ; (d) Welding and forming stage (with stroke of 26.2mm) 由图4(a)可知,在镦粗阶段的后期,坯料开始进入分流孔,但分流孔内金属流速小于挤压轴速度,主要由于镦粗和分流同时进行,导致分流速度减小. 由图4(b)可知,在分流阶段,金属在分流桥的作用下被拆分为3股进入分流孔,分流孔内金属流速远高于挤压轴速度.同时,由于挤压筒中心附近金属流动......