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microstructural Evolution and Service Performance of Cold-drawn Pure Aluminum Conductor Wires

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Journal of materials Science & Technology 2017年第9期33卷 1039-1043页

作者： X.m.Luo Z.m.song m.L.Li Q.Wang G.P.Zhang Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of Sciences

microstructures and service performance(mechanical and electrical properties) of the commercially pure Al conductor wires subjected to different cold drawing strains were investigated. The results show that the microstructures of the cold-drawn Al wires along the radial direction were inhomogeneous, i.e. the texture in the center region was strong and weak components, while that in the surface region shifted from the initial cubic texture to a component and finally developed into a strong component. The volume fraction of the high angle grain boundaries in the surface region was higher than that in the center region. The cold-drawing process greatly enhanced the yield strength of the pure Al wires while retained the acceptable electrical resistivity. The strengthening mechanism and the variation of electrical conductivity of the cold-drawn Al wires are discussed through correlating with microstructure evolution.

关键词： Cold drawing Aluminum microstructure Strength Conductivity

microstructure Dependent Fatigue Cracking Resistance of Ti-6.5Al-3.5mo-1.5Zr-0.3Si Alloy

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Journal of materials Science & Technology 2012年第7期28卷 614-621页

作者： Z.m. song L.m. Lei B. Zhang X. Huang G.R Zhang Shenyang National Laboratory for materials Science Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China AVIC Commercial Aircraft Engine Co. Ltd. Shanghai 200241 China Titanium Alloys Laboratory Beijing Institute of Aeronautical Materials Beijing 100095 China Key Laboratory for Anisotropy and Texture of materials of ministry of Education School of Materials and MetallurgyNortheastern University Shenyang 110819 China

Fatigue cracking behavior from a notch was investigated at room temperature for ***-3.5mo-1.5Zr- 0.3Si （TClI） alloys with four different microstructures obtained at different cooling rates from the β transus temperature. It was found that the alloy with lamellar structures consisting of α/β lamellae or acicular α＇ martensite laths had a higher fatigue crack initiation threshold from the notch, while the bimodal structure with coarse a grain had a lower fatigue cracking resistance. The alloy with α/β lamellar structure showed a higher fatigue crack growth resistance. The length scales of the microstructures were characterized to correlate with fatigue cracking behavior. Fatigue cracking mechanism related to microstructures was discussed.

关键词： Ti alloy Fatigue crack initiation Crack propagation microstructure

Geometrical Scale-Sensitive Fatigue Properties of Ti-6.5Al-3.5mo-1.5Zr-0.3Si Alloys With α/β Lamellar microstructures

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Journal of materials Science & Technology 2014年第12期30卷 1284-1288页

作者： B.Zhang Z.m.song L.m.Lei L.Kang G.P.Zhang Key Laboratory for Anisotropy and Texture of materials Ministry of Education Northeastern University Shenyang National Laboratory for materials Science Institute of Metal Research Chinese Academy of Sciences AVIC Commercial Aircraft Engine Co. Ltd.

Fatigue properties of the Ti-6.5Al-3.5mo-1.5Zr-0.3Si alloy sheets containing different numbers of α/β Widmansttten colonies in the thickness direction of the sheets were investigated by tensionetension fatigue testing. It is found that fatigue properties of the Ti alloy either in low- or high-stress amplitude regimes become more sensitive to the sheet thickness of the Ti alloy as the sheet thickness is comparable to the length scale of the Widmansttten colonies. The basic mechanism of such length scale-sensitive fatigue properties in the Ti alloy was elucidated.

关键词： Fatigue Ti alloy microstructure Size effect

Toward developing Ti alloys with high fatigue crack growth resistance by additive manufacturing

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Journal of materials Science & Technology 2023年第1期132卷 166-178页

作者： F.Wang L.m.Lei X.Fu L.Shi X.m.Luo Z.m.song G.P.Zhang Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China AECC Commercial Aircraft Engine Co. Ltd.Shanghai 201306China

Fatigue crack growth behaviors were investigated by three-point bending tests for TA19 alloy fabricated by laser metal deposition and four kinds of heat-treated *** crack growth resistance of the TA19 samples in the near-threshold regime and Paris regime was evaluated through the experimental characterization and theoretical analysis of the interaction between fatigue crack andα/βphase inter-face,columnar prior-βgrain boundary and colony *** results show that in the near-threshold regime,the fatigue crack propagation threshold and resistance increase with the increase of widths of lamellarαp phases and colonies,and the decrease of the number ofαlaths with an angle(ϕ)relative to the applied stress direction ranging from 75°to 90°.In the Paris regime,the fatigue cracking path can be deflected at colony boundaries or columnar prior-βgrain *** larger the deflection angle,the more tortuous the cracking path and the lower the fatigue crack growth *** angle(γ)of the columnar prior-βgrain growth direction relative to the build direction affects not onlyϕof differentαvariants,but also the fatigue cracking path deflection angle(θij)at columnar prior-βgrain *** optimal combination ofγ=0°-15°-0°-15°for several adjacent columnar prior-βgrains is derived from the theoretical analysis,and that can effectively avoidϕbeing in the range from 75°to 90°and makeθij as large as *** findings provide a guide for the selection of scanning strategies and process parameters to additively manufacture Ti alloys with high fatigue damage tolerance.

关键词： Ti alloy Fatigue crack growth Additive manufacturing Phase interface Grain boundary

On Temperature and Strain Rate Dependent Strain Localization Behavior in Ti-6.5Al-3.5mo-1.5Zr-0.3Si Alloy

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Journal of materials Science & Technology 2013年第3期29卷 273-278页

作者： B.Zhang L.m.Lei X.L.Jiang Z.m.song X.Huang G.P.Zhang Key Laboratory for Anisotropy and Texture of materials(ministry of Education) Northeastern University Titanium Alloys Laboratory Beijing Institute of Aeronautical Materials AVIC commercial Aircraft Engine Co. Ltd. Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of Sciences

Deformation behaviors of Ti-6.5Al-3.5mo-1.5Zr-0.3Si alloys with α/β lamellar structure were investigated systematically at different temperatures from room temperature to 950 ~C and different strain rates. Results reveal that when the deformation temperature is higher than a critical temperature of 600℃, an evident transition of deformation behavior from localized shear banding to α/β lamella kinking, flow softening and temperature/strain rate-dependent peak flow stress occurred in the alloy. The critical conditions for the occurrence of internal cracking and strain localization behavior associated with temperature and strain rate were determined.

关键词： Titanium alloy Hot working Temperature Strain rate Shear band

monetary Policy and Corporate Investment:Evidence from Chinese micro Data

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China & World Economy 2012年第5期20卷 1-20页

作者： Ying Sophie Huang Frank m.song Yizhong Wang College of Economics Zhejiang University School of Economics and Finance University of Hong Kong

This paper investigates how a firm＇s characteristics restrict the influence of monetary policy changes on its investment behavior. Focusing on China＇s listed companies for a sample period from the first quarter of 2002 to the first quarter of 2011, we find that quantity- oriented and price-based monetary policies have heterogeneous impacts on corporate investment behavior, but the influence of monetary policies is constrained by the liquidity, inventory, size and asset-liability ratio of a firm. Firms with higher liquidity, lower inventory level and lower asset-liability ratios are less sensitive to the impact from two kinds of monetary policies. The larger the size of the firm, the less it is subject to influenee from quantity-oriented monetary policy; it responds more to price-based monetary poliey. The policy implication is that the monetary authorities should pay attention to the importance of policy-making based on the monetary demand of mieroeconomie entities.

关键词： micro-transmission mechanism monetary policy

Interest Rate Pass-through in a Dual-track System:Evidence from China

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China & World Economy 2014年第4期22卷 21-39页

作者： Xuejun Jin Frank m.song Yizhong Wang Yi Zhong College of Economics Zhejiang University School of Economics Peking University College of Economics and Academy of Financial Research Zhejiang University

Using the Phillips-Loretan approach, this paper verifies the degree and speed of pass- through and rigidity of different interest rates in China, as well as the response of private loan interest rates to other interest rates during 2002-2012. The results indicate that the long-term pass-through from the interbank offered rates and deposit and loan interest rates to the treasury bond rate is incomplete, but that the long-term pass-through to private loan interest rates is overshooting. The long-term pass-through from the deposit and loan interest rates to the overnight interbank offered rate is incomplete, while that to the interbank offered rates of other maturities is complete. The short-term passthrough and adjustment speed of interest rates exhibit asymmetry. Therefore, before considering a full liberalization of interest rates, it is important to further enhance the competition of the financial system and the function of different interest rate systems, such as the interhank market and bond market.

关键词： interest rate liberalization interest rate pass-through rigidity

Atypical osteochondroma of the lumbar spine associated with suprasellar pineal germinoma:A case report

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World Journal of Orthopedics 2021年第9期12卷 720-726页

作者： Patrik Suwak Scott A Barnett Bryant m song michael J Heffernan Department of Orthopaedic Surgery Louisiana State University Health Sciences CenterNew OrleansLA 70112United States Department of Orthopaedic Surgery Children's Hospital New OrleansNew OrleansLA 70118United States

BACKGROUND Osteochondromas are the most common benign bone tumor,accounting for 36%of benign bone *** found within the appendicular skeleton,osteochondromas of the spine are rare,comprising 4%to 7%of primary benign spinal *** SUmmARY We report a case of a solitary lumbar osteochondroma in an 18-year-old male with a history of a suprasellar pineal germinoma treated with combined chemotherapy and *** underwent mass excision and partial laminectomy with the ultrasonic bone scalpel(misonix,Farmingdale,NY,United States)at the L5 Level without the use of *** patient returned to work and full activities without back pain at 3 mo *** Osteochondromas are common tumors of the appendicular skeleton but rarely occur within the *** case discussion supplements current osteochondroma literature by describing an unusual presentation of this tumor.

关键词： Spine osteochondroma Lumbar osteochondroma Laminectomy Radiationinduced osteochondroma Spine surgery Case report

AB INITIO CALCULATION OF THE ELASTIC AND OPTICAL PROPERTIES OF Al3Sc COmPOUND

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Acta metallurgica Sinica(English Letters) 2007年第6期20卷 425-428页

作者： m. song D.H. Xiao State Key Laboratory of Powder metallurgy Central South UniversityChangsha 410083 China

The ab initio method has been performed to explore the elastic and optical properties of Al3Sc compound, based on a plane wave pseudopotential method. It can be seen that the calculated equilibrium lattice parameter and elastic constants are in reasonable agreement with the previous experimental data. The elastic constants satisfy the requirement for mechanical stability in the cubic structure of the Al3Sc compound. The optical property calculations show that a strong absorptive peak exists from O-15eV and a relative small absorptive peak exists around 30eV. The form is caused by the optical transitions between high s, p, and d bands, and the latter results from the optical transitions from high s, p, and d bands to the low 2p band.

关键词： intermetallic compound Al3Sc, elastic property optical property ab initio calculation