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FATIGUE CRACK PROPAGATION IN Al-Li ALLOY 8090

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Acta Metallurgica sinica(English Letters) 1992年第6期5卷 436-442页

作者： WANG Zhongguang ZHANG Yun HU Zhuangqi State Key Laboratory for Fatigue and Fracture of Materials,Institute of Metal Research,academia sinica,shenyang,ChinaHE Shiyu LI Qingjian Harbin Institute of Technology,Harbin,China Professor Institute of Metal Research Academia SinicaShenyang 110015China

Fatigue crack growth rates of Al-Li alloy 8090 in air were found to be strongly dependent up- on the aging *** naturally aged and underaged specimens showed the highest re- sistance to the fatigue crack *** fatigue crack growth resistance of the overaged specimen is the lowest and that of the peakaged specimen in *** compared to air, 3.5% NaCl solution does not change the effect of aging conditions on the fatigue crack growth,but causes a decrease of the resistance to the fatigue crack growth under the same ag- ing *** short cracks from notch and physically short cracks showed much higher rates of fatigue crack propagation in comparison with long cracks under the same aging condi- tion and stress intensity *** growth behavior of the short crack depends on its *** growth rate of short crack from notch decreases first to a minimum and then increases with in- creasing △***,the physically short crack grows at a progressively increasing rate. The effects of aging conditions are explained in terms of the slip planarity of dislocations and the cyclic slip *** observed short crack behavior is considered to be dependent on the crack closure and the local plasticity near the crack tip.

关键词： Al-Li alloy fatigue crack closure effect slip planarity

Interpretation of the Giant Magnetoresistance Oscillation with the Thickness of Ferromagnetic Layer in Magnetic Multilayers

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Chinese Physics Letters 1995年第8期12卷 485-488页

作者： ZHAO Pingbo LI Bozang PU Fuke Institute of Physics Academia SinicaBeijing 100080 also International Center for Materials Physics Academia SinicaShenyang 110015

In virtue of Mott mechanism,we calculate the giant magnetoresistance(GMR)in Fe/Cr *** results show that the GMR oscillations with the thickness of the ferromagnetic layer is due to the finite size effect of magnetic i... 详细信息

关键词： magnetic ferromagnetic finite

Sputtering Angular Distributions of Individual Elements for Low-Energy Ar Ion Irradiation of PtCu Alloy

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Chinese Physics Letters 1991年第1期8卷 44-47页

作者： ZHENG Liping LI Risheng LI Mingyao SHEN Weizu LIN Junying ZOU Zhiyi Shanghai Institute of Nuclear Research Academia SinicaShanghai 201800 Institute of Metal Research Academia SinicaShenyang 110015

The dynamic Monte Carlo program including a bombardment-induced Gibb-sian segregation process was used to^calculate angular distributions of individual elements from 3putlcrcd Cuq^PIq^alloy in the Ar ion energy range between 0.2 and 1.5ke *** results show that for each investigated incident energy,the angular distribution of the Pt element is more forward-pointed than that of the Cu one;the reason may be that different percentage of sputtered atoms(37-45% of Pt and 12-19% of Cu)come from beneath the topmost layer.

关键词： alloy beneath angular

SiC_(w)/2124Al COMPOSITE FABRICATED BY POWDER METALLURGY TECHNIQUE

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Transactions of Nonferrous Metals Society of China 1992年第2期2卷 68-71,75页

作者： Bi Jing Ma Zongyi Lu Yuxiong Shen Hongwei Gao Yinxuan Institute of Metal Research Academia SinicaShenyang 110015China

Microstructure and properties of SiCw/2124Al composite fabricated by powder metallurgy technique were systematically *** results indicate that the matrix in the composite preserves the microstructural characteristics of microcrystalline aluminum *** whiskers are uniformly distributed in the matrix and the interFacial bonding is *** of the addition of SiC whisker the strength and modulus of the composite increase by 45%and 76%respectively,and the coefticient of thermal expansion decreases by 35%.

关键词： microstructure properties Al composite powder metallurgy

Nonlinear Correction to Stark Ladders

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Science China Mathematics 1994年第1期37卷 81-86页

作者：赵宪庚 International Centre for Materials Physics Academia SinicaShenyang 110015PRCand Institute of Theoretical PhysicsAcademia SinicaBeijing 100080PRC

The problem of a band electron in a crystal with alternating hoppings is investigated in the presence of a uniform electric *** solutions for the energy spectrum and the wave functions are obtained with the help of SU(2) *** is found that the energy spectrum contains all orders of the reciprocal of the applied electric field besides the usual Stark ladders.A theoretical analysis shows that in the weak field regime,such nonlinear terms will dominate the localization behavior of the band *** in the strong field regime am the Wannie-Stark localization be observed *** onset magnitude of the electric field strength for the occurrence of the Wannie-Stark localization is about 2×105V/m for common semiconductor superlattices,which is consistent with experimental observations.

关键词： Stark ladder nonlinear correction onset magnitude

EFFECT OF RARE EARTH ON CONDUCTANCE OF ALUMINUM WIRE

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Transactions of Nonferrous Metals Society of China 1992年第1期2卷 89-92页

作者： Gao Guozhong He Weiyong Chen Jizhi Institute of Metal Research Academia SinicaShenyang 110015China

Effects of Rare Earth(Hereafter RE)on the conductance of high-purity and industrial-purity aluminum wires have been *** increases the resistivity of the high-purity *** evidence has been found that RE will decrease the resistivity of industrial-pure aluminum under various RE content including 0.3%*** individual role of RE and its combined effects with Fe and Si have been discussed too.

关键词： aluminum wire conductance resistivity rare earth(RE) Ce

Effects of Yttrium and Cerium on Compression Properties of Ni_3Al-Base Alloys

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Journal of Rare Earths 1992年第1期10卷 44-48页

作者：李辉郭建亭孙超王淑荷谭明晖 Institute of Metal Research Academia SinicaShenyang 110015China

The effects of yttrium and cerium on the compression properties of Ni_3Al-base alloys have been *** results reveal that the addition of about 0.1 wt% Y to Ni_3Al-B alloy is effective for improving the ductility at 1100℃.A ductility increase of about 100% is observed for this Y doped *** yttrium re- fines grains of the *** YNi_5 phase is found to be precipitated on the grain boundaries in the alloy con- taining 0.3 wt% Yor *** about 0.1 wt% Ce to Ni_3Al-B-Cr-Zr alloy obviously improves the ductility of the alloy at 1100℃.A ductility increase of about 50% is obtained for this *** added cerium also pre- vents the formation of γ+γ' eutectic and refines *** bulk phase of CeNi_4 appeares at the front of the eutectic in the alloys containing 0.1 wt% Ce or more.

关键词： Yttrium Cerium Compressive properties Ni_3Al CeNi_4

Periodic Wave Solution and Its Stability in Antiferromagnet KCuF_(3)

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Chinese Physics Letters 1995年第2期12卷 106-109页

作者： LIU Wuming ZHOU Benlian International Center for Materials Physics Academia SinicaShenyang 110015 CCAST(World Laboratory) P.O.Box 8730Beijing 100080 Institute of Metal Research Academia SinicaShenyang 110015 Institute of Physics Academia SinicaBeijing 100080

Introducing the coherent state ansatz and the time-dependent variational principle,we obtain the two partial different equations of motion from *** the method of multiple scales,we reduce these equations into the envelope function equation and find the amplitude function satisfied a nonlinear Schrödinger *** get the periodic wave solution and analyse its stability antiferromagnet KCuF_(3).

关键词： equation. Periodic function

Solitary Magnon Localization in Antiferromagnet Ni( C_(2)H_(8)N_(2))_(2)NO_(2)C1O_(4)

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Chinese Physics Letters 1994年第7期11卷 447-450页

作者： LIU Wuming ZHOU Benlian International Center for Materials Physics Academia SinicaShenyang 110015 and CCAST(World Laboratory)P.O.Box 8730Beijing 100080 Institute of Metal Research Academia SinicaShenyang 110015

Employing the Holstein-Primakoff transformation and the coherent state ansatz,we obtain two partial differential equations of motion from *** the method of multiple scalar,we reduce these equations into a nonlinear Schrodinger equation and get the single soliton *** results show that solitary magnon localization in antiferromagnet Ni( C_(2)H_(8)N_(2))_(2)NO_(2)C1O_(4) is possible.

关键词： solution soliton equations