共搜索到23804条信息，每页显示10条信息，共2381页。用时：0小时0分0秒655毫秒
of grain growth. The inhibition of grain growth in MAed materials is not only associated with the grain boundary segregation, solute (impurity) pinning, second-phase (Zener) pinning and remnant pore... of grain growth. The stabilizing effect can be related to TiB2 precipitation and the grain boundary pinning effect of these particles. In order to estimate the effect of TiB2 phase on grain growth......
deteriorates the tensile properties. The size and distribution of the second phase at grain boundaries have influence on the degree of corrosion damage, consequently the drop percentage in the tensile properties. Key words: 7055 aluminum alloy; intergranular corrosion; exfoliation corrosion; tensile property; grain boundary second phase 7000系铝合金具有较高的比强度,一直用作飞机的主要结构材料.但在实际服役过程中,尤其是在沿海环境,该系合金往往容易发生局部腐蚀,对飞机的......
grain boundary energy based on modified spherical bicrystal model ZHANG Ming-liang1, YANG Liang1, WEI Cheng-yang1, LI Sai-yi1, 2, 3, ZHANG Xin-ming1, 3 (1. School of Materials Science and Engineering... the energy of an arbitrary grain boundary (GB) was corrected by deleting unreasonable atoms located at the boundary. This model was then applied to calculate the energies of three categories of GBs in Al......
phase boundary layer. Thus the metastable phase Fe3B forms the interpenetrating frameworks, while α-Fe phase nucleates and grows among these frameworks. In one word, Fe3B phase builds an eutectic framework, the second phase distributes within the framework. Investigations have shown that undercooling is favorable to refining the grains[12]. However, SEM micrographs show the grain size of Fe3B......
; Characterization of foreign grain on 6H-SiC facet WANG Ying-min(王英民), LI Juan(李 娟), NING Li-na(宁丽娜), GAO Yu-qiang(高玉强), HU Xiao-bo(胡小波), XU... frequently on the facets of the crystals. To characterize the foreign grain, a longitudinal and a sectional cut samples were prepared by standard mechanical processing method. Raman spectrum confirms......
Drag Effects of Solute and Second Phase Distributions on the Grain Growth Kinetics of Pre-Extruded Mg-6Zn AlloyZhaoyang Jin,Donghua Yu,Xintong Wu,Kai Yin,Kai YanCollege of Mechanical Engineering... with solute and second phase distribution were investigated.Isothermal annealing was conducted on a Gleeble-1500 thermo-mechanical simulator.The mean grain size Dg of each annealed specimen......
compression on the grain boundary segregation and precipitation behavior of M6C carbide in the Ni-20Cr-18W-1Mo superalloy was investigated by thermomechanical simulator, scanning electronic microscope (SEM... boundary region, and further rises the rapid growth of W-rich M6C as compared with the undeformed one. Key words: Ni-20Cr-18W-1Mo superalloy; hot compression; grain boundary segregation; carbide......
-mechanical processing, the alloys have ductilities of 200% to 630%, strain rate sensitivity of about 0.42, and activation energies corresponding to grain boundary diffusion or a mixture of grain boundary...; grain boundary diffusion; lattice diffusion; Al-Cu-Li 1 Introduction The AA2195 Al-Li alloy, which has advantages of high strength, very strong and rapid natural aging capability, good fracture......
Trans. Nonferrous Met. Soc. China 30(2020) 992-1004 Microstructure and grain boundary engineering of a novel Fe-Cr-Ni alloy weldment made with self-developed composition-matched weld filler metal Yu... to characterize the microstructural and textural changes. Various grain boundary engineering (GBE) processes were performed on the weldment. The yield strengths of the weldment at 973 K were obtained before......
X80管线钢的冲击断裂行为邓伟1,高秀华1,秦小梅1,赵德文1,杜林秀1,王国栋1(1.辽宁省沈阳市东北大学轧制技术及连轧自动化国家重点实验室)摘 要:在-20和-60℃对X80管线钢进行Charpy冲击实验,用SEM-EDS对断口进行形貌和夹杂物成分分析,并将断口切开进行金相和EBSD观察,研究X80管线钢的冲击断裂行为.结果表明:温度对X80管线钢最大冲击载荷影响较小,但随实验温度降低,裂纹形成功,裂纹扩展功和止裂后吸收的能量显著减小.在冲击断裂过程中强烈的拉应力作用使断口附近产生变形带,晶粒沿与主裂纹垂直......
