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Dynamic recrystallization and texture development during h.t deformation of magnesium alloy AZ31

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中国有色金属学会会刊：英文版 2009年第1期19卷 55-60页

作者：杨续跃吉泽升 h. miura T. SAKAI Sch.ol of Materials Science and Engineering Central South University Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of Education Central South University College of Materials Science and Engineering Harbin University of Science and Technology Department of Mech.nical Engineering and Intelligent Systems UEC Tokyo Tokyo 182-8585 Japan

Th. dynamic recrystallization(DRX) and texture development, taking place during h.t deformation of magnesium alloy AZ31 with.a strong wire texture, were studied in compression at 673 K (0.73 Tm). Two kinds of samples were mach.ned parallelly to th. extruded and transverse directions of Mg alloy rods. New fine grains are evolved at original grain boundaries corrugated at low strains and develop rapidly in th. medium range of strain, finally leading to a rough.y full evolution of equiaxial fine grains. Kink bands are evolved at grain boundaries corrugated and also frequently in grain interiors at low strains. Th. boundary misorientations of kink band increase rapidly with.increasing strain and approach.a saturation value in h.gh.strain. Th. average size of th. regions fragmented by kink band is almost th. same as th.t of new grains evolved in h.gh.strain. Th.se ch.racteristics of new grain evolution process are not ch.nged by th. orientation of th. samples, wh.le th. flow beh.viors clearly depend on it. It is concluded th.t new grain evolution can be controlled by a deformation-induced continuous reaction, i.e. continuous dynamic recrystallization(DRX). Th. latter is discussed by comparing with.conventional, i.e. discontinuous DRX.

关键词：镁合金 AZ31合金连续动态热处理

Microstructure and mech.nical properties of AZ61 Mg alloy prepared by multi directional forging

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Transactions of Nonferrous Metals Society of Ch.na 2010年第7期20卷 1294-1298页

作者： h. miura G. YU X. YANG T. SAKAI Department of Mech.nical Engineering and Intelligent Systems University of Electro-Communications Chofu Tokyo 182-8585 Japan Sch.ol of Materials Science and Engineering Central South University Changsha 410083 China

AZ61Mg alloy was multi directionally forged(MDFed) during decreasing temperature condition from 643 K to 483 K at a true strain rate of 3×10-3 s-1 up to cumulative strain of∑△ε=4.0 at maximum.A pass strain of△ε=0.8 was *** average grain size decreased gradually with.increasing cumulative strain,th. evolution of fine-grained structure strongly depended on th. MDF *** th. condition wh.re th. temperature was h.gh.r th.n th. most adequate one,grain coarsening partially took place during *** contrast,at lower temperature,inh.mogeneous microstructure composed of th. initial coarse and newly appeared fine grains was *** straining over∑△ε=3.2(i.e.,over 4 passes of MDF) ,equiaxed ultrafine grains(UFGs) h.ving average size of about and lower th.n 1μm were uniformly *** th. MDFed alloy to∑△ε=4.0 possessed relatively h.gh.h.rdness of h. 99,and it accepted furth.r about 20%cold rolling almost with.ut *** of th. superior formability of th. UFGed AZ61Mg alloy,th. h.rdness was furth.r easily raised to h. 120 by following cold rolling.

关键词： AZ61 magnesium alloy ultrafine grain plastic deformation multi directional forging

ULTRAFINE GRAIN FORMATION IN FCC METALS DURING SEVERE PLASTIC DEFORMATION

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ULTRAFINE GRAIN FORMATION IN FCC METALS DURING SEVERE PLASTI...

Temperature Effect on Deformation Microstructures in Austenite

第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： T. Sakai h. miura Department of Mech.nical Engineering and Intelligent Systems UEC Tokyo (Th. University of Electro-Communications) Ch.fu Tokyo 182-8585 Japan

Th. evolution mech.nisms of new h.gh.angle boundaries as well as ultrafine grains in large strain were studied by means of multidirectional forging (MDF) for pure copper at low temperature and aluminum alloy at h.gh.temperature, wh.re dynamic recovery operates as a restoration process. MDF were carried out using rectangular samples with.consequent ch.nging of th. loading direction in 90o th.ough.th.ee of mutually perpendicular axes. Th. structural ch.nges can be ch.racterized by th. evolution of deformation bands such.as microsh.ar or kink bands at moderate strains. MDF accelerates th. evolution of many mutually crossing microsh.ar or kink bands developed in various directions. Th. (sub)grains become more equiaxed and th. misorientations between th.m gradually increase with.increase in cumulative strain, finally leading to th. development of a new fine-grained structure. It is concluded th.t th. dynamic grain formation can result from a kind of continuous reactions involving grain fragmentation due to deformation bands, i.e. in-situ or continuous dynamic recrystallization.

关键词： Ultrafine grained structure severe plastic deformation multidirectional forging grain fragmentation microsh.ar band dynamic recovery continuous dynamic recrystallization.

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MODELING Th. STRESS-STRAIN CURVES UNDER DYNAMIC RECRYSTALLIZATION

第二届先进钢铁结构材料国际会议

作者： A. Belyakov K. Tsuzaki h. miura T. Sakai Steel Research.Center National Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan Steel Research.Center National Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan Department of Mech.nical Engineering and Intelligent Systems The University of Electro-Communications Chofu Tokyo 182-8585 Japan Department of Mech.nical Engineering and Intelligent Systems The University of Electro-Communications Chofu Tokyo 182-8585 Japan

＜正＞A 304-type stainless steel was selected as a typical material with.relatively low stacking fault energy th.t sh.ws conventional dynamic recrystallization （DRX） beh.viour during h.t deformation. Discontinuous DRX took place during th. h.t deformation at sufficient strains, wh.n th. dynamic grain size could be related to th. flow stress with.a grain size exponent of about -0.7. In th. warm deformation conditions, th. new grains were developed as a result of continuous DRX. Th. dynamic grain size could be related to th. flow stress with.smaller grain size exponent of about -0.4. Th. fraction of h.gh.angle grain boundaries in DRX microstructures increases with.decreasing th. temperature in th. h.t deformation range, approach.ng about 70% in th. warm deformation region.

关键词： Austenitic Stainless Steel Warm to h.t Working Dynamic Recrystallization Strain-Induced Subboundaries

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Acta Metallurgica Sinica(English.Letters) 2000年第1期13卷 349-358页

作者： W. Gao T. Sakai and h. miura( Department of Mech.nical Engineering and Intelligent Systems, Th. University of Electro - Communica- tions, Ch.fu, Tokyo 182 - 8585, Japan)

An analytical model for dynamic recrystallization (DRX) is studied based on th. relative grain size model proposed by Sakai and Jonas, and th. ch.racteristic flow beh.viors under DRX are analyzed and simulated. Introducing th. variation of dynamic grain size and th. h.terogeneous distribution of disolo- cation densities densities under DRX,a simple meth.d for modeling and simulating DRX processes is developed by using Laplace transformation th.ory. Th. results derived from th. present model agree well with.th. experimental results in literatures. Th.s simulation can reproduce a number of features in DRX flow beh.viors, for example,single and multiple peak flow beh.viors followed by a steady state flow, th. transition between th.m, and so on.

关键词： dynamic recrystallization computer simulation stress - strain curve single and multiple peaks

Effect of cold-working on corrosion induced damage in lug joints

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Defence Tech.ology（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath.M.N Ch.kmath.L. Murth. h. Department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Department of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

Lug joints are preferred joineries for transferring h.avy loads to parent components in aerospace *** experience corrosion due to environmental conditions,improper surface finish.s and rubbing displacement between th. pin and *** causes damage of different sizes and sh.pes near th. *** degradation due to corrosion-induced damage is modelled as a th.ough.pit at one of th. identified critical locations th.ough.stress *** effect of th.s pit on fatigue crack initiation life is ***-h.le is pre-stressed by cold-working and th. benefits of inducing plastic wake on th. intended performance of th. lug joint during th. damages due to corrosion are brough. out and compared with.non-cold-worked *** analysis is performed on th.s lug joint with.*** results obtained h.gh.igh. th. benefits of cold-working and th. meth.dology can be extended to damage growth.and analyse th. effect of surface treatments for better structural integrity of components of aerospace veh.cles.

关键词： Lug joint Corrosion Crack initiation Cold-working Structural integrity

Editorial for th. Special Issue on Emerging Tech.ology and Advanced Application of Nondestructive Detection for Power Equipment

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Ch.nese Journal of Electrical Engineering 2024年第1期10卷 1-2页

作者： Li J. Mei h. Li S. Tianjin University China Tsingh.a Sh.nzh.n International Graduate Sch.ol China Lanzh.u Jiaotong University China

Th. rapid development of clean and renewable energy tech.ologies represented by wind and solar energy,as well as th. continuous growth.of load demand,h.ve put forward h.gh.r requirements for th. safe operation of th. power *** performance of power equipment based on traditional dielectric materials is often limited by various defects generated during molding,transportation,assembly,and operation,wh.ch.cannot meet th. reliability requirements of power systems in th. new *** detection is an essential tech.ical meth.d in industrial development,wh.ch.can detect and evaluate th. defect and damage status of in-service equipment,key components,and materials with.ut damaging th. object.

关键词： service Application operation

Th. Substructure of Elementary Particles Demonstrated by th. I-Th.ory

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Journal of h.gh.Energy Ph.sics, Gravitation and Cosmology 2024年第2期10卷 469-514页

作者： h. h. Swami Isa Ch.istoph. Dumas Global Energy Parliament Trivandrum Kerala India

Present studies in ph.sics assume th.t elementary particles are th. building blocks of all matter, and th.t th.y are zero-dimensional objects wh.ch.do not occupy space. Th. new I-Th.ory predicts th.t elementary particles do indeed h.ve a substructure, th.ee dimensions, and occupy space, being composed of fundamental particles called I-particles. In th.s article we identify th. substructural pattern of elementary particles and define th. quanta of energy th.t form each.elementary particle. We demonstrate th.t th. substructure comprises two classes of quanta wh.ch.we call “attraction quanta” and “repulsion quanta”. We create a model th.t defines th. rest-mass energy of each.elementary particle and can predict new particles. Lastly, in order to incorporate th.s knowledge into th. contemporary models of science, a revised periodic table is proposed.

关键词： I-Th.ory I-Particle Causal Subtle Gross Quanta Attraction Quanta Repulsion Quanta Elementary Particles Leptons Bosons h.dron Periodic Table Black Matter Wh.te Matter Red Matter Gravitation Strong Force Weak Force Quantum Th.ory h.at Quantum Ph.ton Neutrino

Th. Fundamental Th.ory of Artificial Intelligence—Logic Structure and Logic Engineering

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Intelligent Control and Automation 2024年第1期15卷 28-62页

作者： Dong h. Liu Sch.ol of Computer Science Guangdong Normal University of Technology Guangzhou China

Th. research.purpose of th.s dissertation is th.eefold: to innovate artificial intelligence meth.ds, to create th. intersection of artificial intelligence and biological research. and to innovate h.man meth.dology. Th. work I h.ve done in my research.includes: improving logical structure and logical engineering, using my th.ory to study th. innovation of th. development path.of artificial intelligence, using my th.ory to create biomimetic logic, a new intersection of artificial intelligence and biological research. and exploring th. innovation of h.man meth.dology th.ough.th. previous two works. Th. results of th. research.are as follows: 1) Introduction to bionic logic, incorporating simulations of people, society, and life as core principles. 2) Definition of th. logical structure as th. primary focus of research. with.logic mech.nics serving as foundational research.principles. 3) Examination of th. logical structure’s environment th.ough.logical fields and networks. 4) Study of logical structure communication via logical networks and main lines. 5) Proposal of data logic. 6) Investigation into th. logic of logical structures, employing structural diagrams of logical equations. 7) Development of a th.ory of life activity with.n logical structures, encompassing information reasoning, its corresponding control structure, and structural reasoning. 8) Introduction of th. lifecycle th.ory for logical structures and examination of th. clock equation. 9) Exploration of logical structure intelligence. 10) Study of logical structures in math.matical forms. 11) Introduction of logic engineering. 12) Examination of artificial intelligence’s significance. 13) Investigation into th. significance of h.man meth.dology.

关键词： Bionic Logic Structural Diagram of Logical Equation Data Logic Intelligence