检索结果-南通市图书馆

Designing New Alloys with High Strength and ductility

在线全文

学校读者我要写书评

暂无评论

材料导报 2020年第13期34卷 13003-13004页

作者： C.Suryanarayana Department of Mechanical and Aerospace Engineering University of Central FloridaOrlandoFL.32816-2450U.S.A

Materials scientists have been constantly on the lookout for materials that simultaneously exhibit high strength and good ductility,which is contrary to common wisdom[1].Earlier attempts to achieve this unusual combination have met with limited success[2].Novel approaches such as a duplex microstructure consisting of nanocrystalline and ultrafine grains yielded encouraging results[3].While the nanocrystalline structure provided high strength,the ultrafine-grained(or relatively coarse-grained)structure provided the needed ductility.

关键词： ductility grain strength

EFFECT OF Zr ON ductility OF CAST Ni_3 Al-BASE ALLOYS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1992年第6期5卷 409-413页

作者： ZHENG Zhi WU Weiwen GUO Jianting ZHU Yaoxiao Institute of Metal Research,Academia Sinica,Shenyang,China Institute of Metal Research,Academia Sinica,Shenyang 110015,China Inst of Metal Research Acad Sinica Shenyang China

Many compressive and tensile tests showed that the room temperature ductility of boron-free Ni_3Al alloy may be markedly improved by a moderate addition of Zr.The ductility of the stoichiometric Ni_3Al and even slightly enriched with Al,may be improved fairly between 400 —600℃,which behaves much better if Zr is added together with B.However,the high tem- perature ductility of Ni_3Al alloys containing Cr may be significantly increased by Zr which segregates slightly along grain boundaries.Thus,the toughening mechanism of Zr alloying seems to be different from that of B addition.

关键词： Ni_3Al Zr toughening ductility brittleness

Effects of alloy elements on ductility and thermal conductivity of compacted graphite iron

在线全文

学校读者我要写书评

暂无评论

China Foundry 2018年第3期15卷 189-195页

作者： Dong-mei Xu Gui-quan Wang Xiang Chen Yan-xiang Li Yuan Liu Hua-wei Zhang School of Materials Science and Engineering Tsinghua University Beijing 100084 China Key Laboratory for Advanced Materials Processing Technology (MOE) Tsinghua University Beijing 100084 China

The infl uence of Si, Sn, Mo and Ni on the ductility and thermal conductivity of compacted graphite iron(CGI) was investigated. Metallographic observation and Differential Scanning Calorimetry(DSC) experiments were carried out to analyze the roles of various additions in the eutectoid reaction. The experimental results showed that the ductility of CGI is proportional to the ferrite fraction, so moderate Si content could dramatically improve the ductility by increasing the ferrite fraction. DSC measurements showed that Mo has moderate inhibition on eutectoid transformation during both the heating and cooling processes, while the sample without Sn obviously broadens the three-phase region. Vermicularity and ferrite are known to improve thermal conductivity, and the former plays a more important role. Besides, among the alloy elements investigated, Sn has the greatest negative effect on conductivity, followed by Ni and Mo having the smallest effects.

关键词： compacted graphite iron ductility thermal conductivity

Fracture characteristics and ductility of cracked concrete beam post-strengthened with CFRP Sheet

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2011年第3期18卷 5-10页

作者：易富民董伟赵艳华吴智敏 The State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

The present paper concerns the fracture characteristics and ductility of cracked concrete beam externally bonded with carbon fiber-reinforced polymer (CFRP) sheet as well as the integration behaviors between CFRP/concrete interfacial debonding and concrete cracking.Three-point bending tests were carried out on the CFRP-strengthened cracked concrete beams with varying specimen depth and initial crack length.A straingauge method was developed to monitor the crack initiation and propagation in concrete,and the CFRP/concrete interfacial bonding behaviors,respectively.Clip gauges were used to measure crack mouth opening displacement (CMOD) and the deflection at midspan.Experimental results revealed that CFRP-strengthened specimen shows a higher load capacity under the same deformation level and a better inelastic deformation capacity compared with the unstrengthened one.For there are two manifest peak values in the obtained load versus displacement curve,the ductility of CFRP-strengthened concrete beams were investigated using index expressed as area ratio on the load versus displacement curve.The calculated results indicated that the contribution from CFRP sheet to the ductility improvement of specimen is notable when the deflection at midspan exceeded 10.5 times the first-crack deflection.

关键词： FRP composites cracked concrete beam fracture characteristics ductility

STRENGTH AND ductility OF Ni-Cu-BASE ALLOY MONEL K-500

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1995年第1期5卷 111-115页

作者： Wang Zhixing Xie Shishu Liu Shigui Yuan Chao Yang Hongcai(Department of Materials Science and EngineeringNortheastern University, Shenyang 110006) NORTHEASTERN UNIV DEPT MAT SCI & TECHNOLSHENYANG 110006PEOPLES R CHINA

ＳＴＲＥＮＧＴＨＡＮＤＤＵＣＴＩＬＩＴＹＯＦＮｉ－Ｃｕ－ＢＡＳＥＡＬＬＯＹＭＯＮＥＬＫ－５００Ｗａｎｇ；ＺｈｉｘｉｎｇＸｉｅ；ＳｈｉｓｈｕＬｉｕ；ＳｈｉｇｕｉＹｕａｎ；ＣｈａｏＹａｎｇ；Ｈｏｎｇｃａｉ（Ｄｅｐａｒｔｍ... 详细信息

ＳＴＲＥＮＧＴＨＡＮＤＤＵＣＴＩＬＩＴＹＯＦＮｉ－Ｃｕ－ＢＡＳＥＡＬＬＯＹＭＯＮＥＬＫ－５００Ｗａｎｇ；ＺｈｉｘｉｎｇＸｉｅ；ＳｈｉｓｈｕＬｉｕ；ＳｈｉｇｕｉＹｕａｎ；ＣｈａｏＹａｎｇ；Ｈｏｎｇｃａｉ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉ...

关键词： monel work hardening age hardening ductility

First-Principles Prediction of ductility in β-type Ti-Mo Binary Alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2011年第2期16卷 227-230页

作者：赖敏杰薛祥义周中波唐斌李金山周廉 State Key Laboratory of Solidification Processing Northwestern Polytechnical University

Recent studies suggest that the ratio of the shear modulus (G) to the bulk modulus (B) and the Poisson's ratio (ν) are good indicators of ductility.Using the method of supercell and the first-principles pseudopotential plane-wave method,the G/B and ν of the β-type Ti-Mo binary alloys with Mo molar fraction (xMo) ranging from 6.25% to 37.5% are calculated.The results show that the ductility of β-type Ti-Mo binary alloys first increases with increasing x Mo and reaches the maximum when x Mo is about 25%,and then reduces with more increasing x Mo.The charge density difference calculations suggest that the x Mo dependence of the ductility can be ascribed to the change of bonding characteristics between Ti and Mo atoms in the [111] direction.

关键词： Ti-Mo alloys first-principles ductility charge density difference

ductility ENHANCEMENT OF Al RICH Ni_3Al BY DIRECTIONAL SOLIDIFICATION

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1999年第S1期9卷 208-213页

作者： J. Chen, B. Y. Huang and X. H. Qu Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083, China Z. Q. Hu Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China

Stoichiometric (25.0% Al in mole) and hyperstoichiometric (26.5% Al in mole) Ni 3Al alloy can be made ductile by directional solidification in ceramic mould. In the stoichiometric alloy, texture formation varies between samples and more than 20% plastic elongation can be obtained. In the hyper stoichiometric alloy, strong 〈110〉 texture forms and 12% plastic elongation can be obtained. The high plastic elongation of the directionally solidified alloy is attributed to the suppression of intergranular fracture by reducing the portion of the transverse boundaries. The texture and microstructure formation mechanism were proposed.

关键词： Ni 3Al directional solidification ductility texture

Microstructure and mechanical properties of a high ductility Mg–Zn–Mn–Ce magnesium alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2013年第4期1卷 283-291页

作者： Lei Gao Hong Yan Jun Luo Alan A.Luo Rongshi Chen General Motors China Science Lab 56 Jinwan RoadPudongShanghai 201206China State Key Laboratory for Corrosion and Protections Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016LiaoningChina College of Engineering The Ohio State UniversityColumbusOH 43210USA

A high-ductility ZME200(Mg–2.3Zn–0.4Mn–0.2Ce^(1))alloy was newly developed for vehicle closure and structure applications,based on an earlier ZE20(Mg–2.0Zn–0.2Ce)alloy for extrusion applications.Previous study indicates that the hot deformation behavior of as-cast ZME200 alloy varies with processing parameters,namely temperature and strain rate.In this follow-up study,a conventional rolling process was optimized to obtain magnesium sheets with a very fine grain structure and high ductility.The microstructure,mechanical properties,and corrosion resistances of ZME200 alloy were investigated,and compared with those of commercial AZ31 magnesium alloy.It was demonstrated that the ZME200 alloy sheet exhibits extraordinarily higher ductility(36%in tensile elongation),much superior stretch formability(an Erichsen value of 9.5),lower anisotropy,comparable strength and corrosion resistance to AZ31 alloy.The unique RD–TD double split texture with remarkably reduced intensity and grain refinement gives rise to the significantly improved ductility and formability at room-temperature.

关键词： Magnesium sheet Mg-Zn-Mn-Ce ductility Texture

Influence of grain size on the tensile ductility and deformation modes of rolled Mg–1.02 wt.%Zn alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2013年第3期1卷 210-216页

作者： B.Q.Shi R.S.Chen W.Ke State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChina The University of the Chinese Academy of Sciences Beijing 100049China

The influence of grain size on the tensile deformation and ductility for Mg–1.02%Zn(wt.%)alloy was investigated.The uniform elongation is nearly insensitive to the increase of grain size,but the post-uniform elongation is significantly decreased with increasing grain size.The high ductility in the fine-grained samples is due to the lower frequency of twins and increased dynamic recovery from the enhanced activation of prismaticslip.

关键词： Magnesium ductility Texture Strain hardening rate Prismatic slip