Al基五元高熵合金的热力学研究

高熵合金具有高硬度、高强度、良好的耐磨性以及耐腐蚀性等优异性能。高熵合金一般由5种或5种以上金属元素组成,不同金属元素可以提高合金内部混乱程度,形成具有简单晶格结构的固溶体相。Miedema理论和几何扩展模型可以计算多组元合金固溶状态的混合焓,而混合焓对高熵合金的固溶相的形成有重要影响。本文利用扩展Miedema理论计算Alx(CuMgSi-T)1-x (T=Ag, As, Au, B, Ba, Be, Bi, C, Ca, Cd, Co, Cr, Cs, Fe, Ga, Ge, Hf, Hg,In, Ir, K, La, Li, Mn, Mo, N, Na, Nb, Ni, Os, P, Pb, Pd, Pt, Rb, Re, Rh, Ru, Sb, Sc, Sn, Sr, Ta, Tc, Ti, Tl, V, W, Y, Zn, Zr)五元合金体系固溶状态的混合焓,用已有高熵合金混合焓和原子尺寸判据来预测了Alx(CuMgSi-T)1-x五元高熵合金的成分范围。计算结果表明,Alx(CuMgSi-T)1-x(T=Ag, As, Au, Cd, Co, Cr, Fe, Ga, Ge, Hf, Hg, In, Ir, Li, Mn, Mo, Nb,Ni, Os, Pd, Pt, Re, Rh, Ru, Sb, Sc, Sn, Ta, Tc, Ti, V, W, Zn, Zr)五元体系合金混合焓和原子尺寸方均差δ参数满足相关判据,易于形成五元高熵合金。采用混合焓和δ参数判据可以预测高熵合金的成分,为高熵合金设计提供较为精确的热力学数据。     

SLD模具钢

正高耐磨性冷作模具钢,淬透性佳,热处理变形小,宜制作重负荷冷冲压模或热作修整模,易于加工。易于车削,并宜制造锋利刀口,剪刀,圆锯,五金冲压模具,成型轧辊,滚筒边,螺丝纹,线模,铣刀,冲啷模,圆型滚筒,电力变压器心冲模,切割钢皮轧刀,钢管成型滚筒,特殊成型滚筒,精密规,形状繁杂之冷压工具,冶金,锡     

Chemical behaviors of different arsenic-bearing sulphides bio-oxidated by thermophilic bacteria

1INTRODUCTION Arsenic bearinggoldoreiswidelydistributedinprovincesofYunnan,Guizhou,Sichuan,Guan gxi,Guangdong,Hunan,Jiangxi,Liaoning,Jilin,Hebei,Shanxi,Gansu,Qinghai,Xinjiang,etc.Withtheprocessdevelopmentofbacteriummetal lurgy[1,2],suchgoldoreresourcemaybereasona blyutilized,however,arsenicintheseoresishigh lytoxictotheleachingbacteriaandbecomesthe researchfocus.Arsenicisacomplexandvitalele mentofarsenic bearingmineralswiththeelectronconfigurationof4s34p3[3].WhenAslosesthree electro…     

修补用镀笔

美国Selectrons公司生产一种电镀笔,其工作原理如图所示.被镀物接直流电源负极,镀笔阳极与电源正极相连,阳极上缠有吸收棉,把所需金属镀液加入其中,接通电源就可进行电镀.电镀时阴极或阳极要进行直线往返运动或转动,不需要镀槽.金属镀液可以是Bi, Cd,Cr,Co,Cu、Fe,Pb,Ni,Sn,Zn,Au,In,Pd,Ru,Ag,Ni-W,Ni-Co,     

光谱法测定钛及钛合金中的微量杂质元素

采用发射光谱分析技术,研究了钛及钛合金中Zr,Ru,Pd,Hf,Cu,Y,V,Mo,Nb,Al,Co,Ni,Ta,Bi,Sn,Cr,Mn的光谱测定方法。结果表明,选用碳粉作为缓冲剂,使用浅孔电极和大电流激发,一次摄谱可同时测定17个杂质元素。测定下限为3×10-4%～15×10-3%,相对偏差在15%以内。     

NUMERICAL SIMULATION OF FORGING AND SUBSEQUENT HEAT TREATMENT OF A ROD BY A FINITE VOLUME METHOD

1.air-nonAtypicalindustrialmetalcoml,onentwouldoftenbemadeviatheforgingandheattreatm',ntoperationsintilenlarlufacturingstage.IntiledesignOfforgingprocesses,informationisllecesstllysuchasmaterialflowinthedies,levelofdiefill,del'ects,strain,stress,temperaturedistributioninthebarkpiecesaxltlthedies,andforgingforce.InthesubseqUentheattreatmentoperations,illf(,mlationoncolllbinationOfrnicrostructure,residualstressesanddiTocnsionalaccuracyintilel'illalproductalealsoveryimportant.Suchinformationmay…     

无苯去漆剂的研制

介绍了无苯去漆剂的配方,性能及其去除各类漆膜的实际应用效果,无苯去漆剂克服了含苯及其衍生物为原料的去漆剂毒性大,挥发性强,选择性强,适用范围窄,退漆速度慢等缺点,可用于硝基,氨基,过氯乙烯基,酚醛树脂,环氧树脂,聚氨脂,沥青,醇酸,丙烯酸等多种漆膜,适用于碳钢,不锈钢,铜,铝及木质家具等多种材料表面漆膜的去除,具有水冲洗方便,使用安全可靠,效果显著等优点。     

钛合金化学分析标准试样的研制

报导了TC1,TC4,TC6,TC10,TC11 5种牌号钛合金化学分析标准试样的研制工艺。标样包括的成份有Al,V,Mo,Zr,Si,Fe,Cu,Mn,Sn,Cr 10种合金成份和Fe,Si,C,N 4种杂质成份。     

临床试验机构研究者标准操作规程

依据SFDA《药品临床试验管理规范》,ICH GCP,WHO GCP,以及我院临床试验的实践,制订临床试验机构研究者的标准操作规程,包括研究者资格与条件,试验前的准备,受试者的招募和筛选,受试者的知情同意,方案的依从性,受试者的医疗,随机化程序和破盲,安全性报告,源文件和源数据,病例报告表,试验用药的管理,试验的终止或暂停,进展报告和总结报告,档案等。     

特集序

星横斗转,沧桑更迭,弹指之间,倏忽十载。回首往事,岁月峥嵘,物我两非,感慨万千! 众多的园丁——读者、译者、编者、同行、师友……,年复一年,日复一日,劳作不息,耕耘不辍,浇的是汗水,灌的是心血,使刊物经受了磨砺,没有凋零,没有夭折,反而葱茏挺拔,卓然而立,正所谓“艰难玉成”。所有的园丁,对自己的劳动成果,怀着同样喜悦的心情,庆祝它十周岁生日。主管部门     

依靠科技创新全面提升竞争力——记本刊理事、晋阳碳素股份有限公司总经理段学良

段学良,男,1965年生,山西省灵石县城关常青人,中共党员,大学文化,高级工程师,历任晋阳电碳厂化验室主任,质检科长,基建部长,生产部长,生产副厂长。1994年3月28日至1999年11月为晋阳碳素股份有限公司副董事长,副总经理。现任山西省晋阳碳素股份有限公司副董事长、总经理,山西省政协委员,山西省工商联合会执行员,晋中市工商联合会常委,第八届山西青联委员,省青年企业家协会会员,中国碳素行业协会理事,武汉科技大学碳素科技编辑部编委会委员。     

史记·铝君列传

<正>铝君者,百五十岁。生于西洋,初为皇家奢侈之物,民国初年传入泱泱华夏,渐入百姓之家。倭寇来袭,于伪满洲国抚顺始建工厂。至新中国成立,铝君各处相继安家。起初,铝君孱弱,进口者众,至中兴,渐次平衡,新千年历,铝君超众,如过江之鲫,一发不可收拾,若钢铁,若水泥,若造纸,若平板玻璃,更尊铝君者为剩之先也。铝君始出荣华,曾锦衣玉食,驷马之驾,横扫千秋,载誉荣光。后因江湖     

Microstructures and mechanical properties of Al-Mg and Al-Zn-Mg based alloys containing minor scandium and zirconium

1　INTRODUCTIONAddingofminorMn ,Cr ,Ti,B ,Zr ,Sc ,Agintoaluminumalloyscanremarkablychangethemi crostructuresandpropertiesofaluminumalloys[18] .Amongthem ,theeffectofminorScandZrhasre ceivedspecialattention .Onthe 1stInternationalScandiumConferenceheldinMoscowin 1994 ,Rus sianmetallurgistsdescribedtheapplicationprospectofaluminumalloyscontainingScinaerospace ,aviation ,warshipsandnuclearindustry ,whichhasstimulatedmanyindustrialcountries’researchinterestinthiskindofalloys .Atpresent…     

Investigation of exfoliation corrosion of rolled AA8090 Al-Li alloy using electrochemical impedance spectroscopy

1　INTRODUCTIONAl Lialloys ,comparedtotraditionalAlalloys ,havemoreexcellentproperties,suchaslowerdensi ty ,greaterelasticmodulusandhigherspecificstrength[1,2 ] .Inthenearfuture ,theywillbewidelyappliedtoairplanestructures.While ,exfoliation ,amainkindoflocalizedcorrosion ,lowerstheirstrength ,plasticityandfatigueproperties ,andalsodecreasestheirservicelife[35] .Soinvestigatingtheirexfoliationwillbeveryimportanttotheirapplication .　　　　　　Usually ,theexfoliationratingsareobservedbyna…     

一些材料的腐蚀性能(之三)

(五)ABS塑料: 不腐蚀介质:醋酸,硼酸,酸,碳酸钾,氯化钠,硫酸。 腐蚀介质:醇,氯,铬酸,柠檬酸,甘油,盐酸,过氧化氢,硫化氢,氯化镁,磷氢氟酸,硝酸,二氧化硫。一些材料的腐蚀性能(之三) ~~     

Influence of Ca addition on valence electron structure of Mg_(17)Al_(12)

1　INTRODUCTIONMagnesiumalloyshaveemergedaspotentiallygoodcandidatesfornumerousapplications ,especiallyinautomotive ,aerospaceandelectronicindustry .Theirgoodproperties ,suchaslowdensity ,highspe cificstrengthandgooddampingcapacity ,makethemthepromisingreplacementsforotherstructuralmate rials,forinstance ,steel,castiron ,andevenalu minum[1,2 ] .Thewidelyusedmagnesiumalloysbe longtoMg Al Zn (AZ)series ,suchasAZ91(Mg 9Al 1Zn) ,whichhaveexcellentcastability ,goodroomtemperaturemechanicalp…     

Preparation of Ir/IrO_x pH electrode based on melt-oxidation and its response mechanism investigation

1　INTRODUCTIONMetaloxideswereregardedasthealternativestoconventionalglasselectrode .VariousmetaloxideshavebeensuggestedaspHsensingelectrode ,suchasMnO2 ,PbO2 ,Co3O4 ,TiO2 ,PtO2 ,RuO2 ,RhO2 ,OsO2 ,IrO2 [16 ] .Amongthelargenumberofthereportedmateri als ,iridiumoxideistheoneofthemostpossiblecan didatesforsuchapplication[2 ] ,anditcanbepreparedbyseveralmethods ,suchaselectrochemicaloxida tion[7] ,sputtering[8] ,thermaloxidization[913] .Al thoughIrOxisoneofthebestmetaloxideforpHsensi…     

Numerical simulation of two-stage deep drawing of complex-shaped parts

1　INTRODUCTIONInrecentyears ,withtherapiddevelopmentofcomputersoftwareandhardware ,andtheintersectionandcombinationofcomputertechnology ,graphics ,mechanicsandprocessengineering ,thecomputeraid edengineering(CAE)technologybasedonnumericalsimulationhasbeenwidelyappliedinthesheetmetalformingfield[1,2 ] .Nevertheless ,untilnow ,thenu mericalsimulationisconfinedtosimulatesomebasicmodesofdeformationsuchasbending ,deepdraw ing ,bulgingandflanging .Forthedeformationofcomplexwork pieces ,forexa…     

The ancient Chinese casting techniques

In the course of Chinese civilization,which lasted more than 5,000 years,casting production has made a huge contribution.In this paper,some representative metal castings were presented.According to their forming techniques,they can be grouped into stone mould casting,clay mould casting,ablation casting,lost wax casting,stack casting,permanent mould casting,sand casting,etc.According to their materials,they can be categorized into tin bronze,bimetallic bronze,malleable cast iron,ductile cast iron,brass,cupronickel alloy (Packtong),etc.According to their surface decorative techniques they can be devided into gem inlay,gilding,gold and silver inlay,copper inlay,engraved decoration,surface tin-enrichment,mother-of-pearl inlay,burnished works with gold or silver inlay,surface coloring and cloisonné enamel,etc.     

Investigation on in-flight particle velocity in supersonic plasma spraying

0Introduction Asakindofsurfaceengineeringtechnology,thermal sprayingcanprovideprotectiveorfunctionalcoatings whicharewidelyusedinmanyindustrieslikechemistryin dustry,papermaking,electricengineering,powerplant, aviation,automobileproducing,steelmill,glass…