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Hydrogen-Induced Cracking of Two-Phase Alloy of Ni3Al+NiAl

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Journal of materials science & technology 2003年第3期19卷 259-261页

作者： Jinxu li, yanbin wang, lijie QIAO wuyang chuDepartment of materials physics and chemistry, university of science and technology beijing, beijing 100083, china dept. of Mat. Phys. and Chem. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Hydrogen-induced cracking (HIC) of two-phase alloy of Ni3AI+NiAI was in situ investigated using a WOL (wedge opening-loading) constant deflection specimen in an optical microscopy and using a notched tensile specimen in scanning electron microscopy (SEM). Results showed that the threshold stress intensity of HIC was KIH=15.7 MPa·m1/2, and (da/dt)II=0.019 mm/h. For the uncharged specimen, microcrack initiated and propagated preferentially within the NiAl phase, resulting in cleavage fracture, but for the precharged specimen with hydrogen concentration of 24.7×10-4%, hydrogen-induced crack initiated and propagated preferentially along the Ni3AI/NiAI interfaces, resulting in interphase fracture.

关键词： Ni3Al+NiAl HIC In situ extending SEM

Scalable parallel ultrafast optical random bit generation based on a single chaotic microcomb

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light(science & Applications) 2024年第4期13卷 637-644页

作者： Pu li Qizhi li Wenye Tang Weiqiang wang Wenfu Zhang Brent Elittle Sai Tek chu KAlan Shore Yuwen Qin Yuncai wang Institute of Advanced Photonics technology School of Information EngineeringGuangdong University of TechnologyGuangzhou 51006China. Key Laboratory of Photonic technology for Integrated Sensing and Communication Ministry of Education of ChinaGuangdong University of TechnologyGuangzhou 51006China. Guangdong Provincial Key Laboratory of Information Photonics technology Guangdong University of TechnologyGuangzhou 51006China. Key Laboratory of Advanced Transducers andIntelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China. State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China. Department of physics and materials science City University of Hong KongHong KongChina. School of Electronic Engineering Bangor UniversityBangorWales LL571UTUK

Random bit generators are critical for information security,cryptography,stochastic modeling,and *** and scalability are key challenges faced by current physical random bit ***,we propose a massively parallel scheme for ultrafast random bit generation towards rates of order 100 terabit per second based on a single micro-ring resonator.A modulation-instability-driven chaotic comb in a micro-ring resonator enables the simultaneous generation of hundreds of independent and unbiased random bit streams.A proof-of-concept experiment demonstrates that using our method,random bit streams beyond 2 terabit per second can be successfully generated with only 7 comb *** bit rate can be easily enhanced by further increasing the number of comb lines *** approach provides a chip-scale solution to random bit generation for secure communication and high-performance computation,and offers superhigh speed and large scalability.

关键词： resonator random chaotic

Relationship among Parameters Evaluating Stress Corrosion Cracking

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Journal of materials science & technology 2000年第5期16卷 504-508页

作者： wuyang chu+, lijie QIAO and yanbin wang (Department of materials physics, university of science and technology beijing, beijing 100083, china) Department of materials physics University of Science and Technology Beijing Beijing 100083 China

The threshold stress, σc, for sulfide stress corrosion cracking (SCC) of seven pipeline steels and five other steels, the critical stress, Sc, for seven pipeline steels and two drill rod steels with various strengths and the susceptibility to SCC, IRA or σf(SCC)/σf, for four pipeline steels, two drill rod steels and five other steels were measured. The results showed that there are no definite relationships among σc, Sc and IRA or σf(SCC)/σ*** threshold stress for hydrogen induced cracking (HlC) during charging with loading in the H2S04 solution, σc(H), decreased linearly with logarithm of the concentration of diffusible hydrogen c0, i.e., σc(H)=A-B Inco for four pipeline steels. σc(H) obtained with a special cathodic current ic, which was corresponding to the diffusible hydrogen concentration during immersing in the H2S solution, were consistent with /c for sulfide SCC for four pipeline steels. Therefore, σc for sulfide SCC can be measured using dynamically charging in the H2SO4 solution with the special cathodic current ic.

关键词： SCC Relationship among Parameters Evaluating Stress Corrosion Cracking HIC

Stress Corrosion Cracking and Passive Film-inducedTensile Stress in α-Ti

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Journal of materials science & technology 2001年第4期17卷 413-416页

作者： Hong LU Kewei GAO, Hui liU lijie QIAO and wuyang chu dept. of materials physics, university of science and technology beijing, beijing 100083, china dept. of Mat. Phys. Univ. of Sci. and Technol. Beijing Beijing 100083 China

α-Ti foil with a protective layer formed on one side was deflected during corrosion in a methanol solution containing 0.6 mol/L KCI and then a tensile stress was generated at or near the metal passive film interface. The in situ TEM observation showed that corrosion process could facil- itate dislocation emission and motion. Adding 10% H2O into the methanol solution decreased the passive film-induced stress from 320 MPa to zero, and the susceptibility to SCC measured in slow strain rate tests decreased correspondingly from 98% to zero.

关键词： Ti Stress Corrosion Cracking and Passive Film-inducedTensile Stress in SCC

Film-induced Tensile Stress during CorrosionProcess for α-Ti

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Journal of materials science & technology 1998年第4期14卷 294-298页

作者： Hong LU Kewei GAO and Wuyng chu(dept. of materials physics, university of science and technology beijing, beijing 100083, china) dept. of materials physics University of Science and Technology Beijing Beijing 100083 China

The α-Ti foil with protective layer in one side bended to corrosion surface gradually during corrosion process in 0.1 mol/L H2SO4, while the passive film was formed, i.e., a tensile stress was developed in the surface layer of the sample. The extra tensile Stress grew gradually, whose maximum value is =313 MPa (average of 5 samples), which is near or reaches the yield stress. The extra tensile stress would be added to the load Stress during SCC to facilitate the emission and motion of dislocation, so that SCC cracks could nucleate in lower Stress(or lower KI).

关键词： Film-induced Tensile Stress during CorrosionProcess for Ti SCC

X-RAY TOPOGRAPHIC STUDY OF HYDROGEN DAMAGE IN Fe-3 wt-% Si ALLOY

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Acta Metallurgica Sinica(English Letters) 1993年第8期6卷 87-91页

作者： wang yanbin wang Anrong chu wuyang XIAO Jimei university of science and technology beijing,beijing,china associate professor,Department of materials physics,university of science and technology beijing,beijing 100083,china beijing Univ of science and Technology Beijing China

The formation and aggravation of hydrogen damage in Fe-3 wt-％ Si alloy during cathodic charging Were studied by means of Lange transmission X-ray *** showed that hydrogen damage did not form in the specimens charged in 0.5 mol/L H_2S0_4 so- lution without poison,and occurred with addition of 250 mg/L As_2O_3 even at very low charge current *** charging at a certain current density,the size of the damage may enlarge up to a limit yet no more by prolonged *** damage size increased with increase of charging current density,but not so apparent at high current density. An external tensile stress could promote the formation of hydrogen damage obviously. It seems that for charging in H_2SO_4 solution containing poison,the drop of hydrogen permeation curve against time prolongation is due to the formation of hydrogen damages.

关键词： hydrogen embrittlement X-ray topography Fe-3 wt-%Si alloy

EFFECT OF COMPOSITION ON HYDROGEN EMBRITTLEMENT IN Ni-Fe FCC ALLOYS

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Acta Metallurgica Sinica(English Letters) 1992年第6期5卷 443-448页

作者： HU Wei wang yanbin chu wuyang XIAO Jimei university of science and technology beijing,china Associate Professor,Department of materials physics,university of science and technology beijing,beijing 100083,china beijing Univ of science and Technology Beijing China

The ductility loss and threshold stress intensity,K_(IH)during hydrogen charging were measured for pure Ni and four Ni-Fe fcc *** results show that ductility loss in 40Ni60Fe alloy and K_(IH)a 50Ni50Fe alloy have a minimum *** variations of the amounts of hydride, hydrogen evolution and dislocation structure with composition have been *** va- riation of hydrogen embrittlement susceptibility with composition measured by ductility loss and by K_(IH)or K_(IH)/K_C can be explained by means of the synthetical effects of amount of hydride,solutionized hydrogen and the extent of dislocation planarity on hydrogen embrittlement susceptibility.

关键词： Ni-Fe alloys hydrogen embrittlement

In situ TEM observation of magnetization-enhanced dislocation emission and motion for 60Fe40Ni alloy

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Chinese science Bulletin 1997年第24期42卷 2064-2066页

作者： li hongqi, wang yanbin, CHEN Qizhi chu wuyangDepartment of materials physics, university of science and technology beijing, beijing 100083, china Department of materials physics University of Science and Technology Beijing Beijing China

TENSILE test for pure iron in the magnetic field with the intensity of 2 400 A/m indicated thatthe lower yield stress was decreased and the upper yield point disappeared in the magneticfield. This seems to show that magnetization can reduce the resistance of dislocation mo-tion. Up to now, however, direct proof of magnetization-enhanced dislocation emission andmotion is lacking.

关键词： magnetic field dislocation magnetic domain TEM.

Effect of Hydrogen on Dezincification Layer-Induced Stress

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Journal of materials science & technology 2003年第3期19卷 287-288页

作者： wuyang chu, Kewei GAO, Yapin liU lijie QIAODepartment of materials physics, university of science and technology beijing, beijing 100083, china dept. of Mat. Phys. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The effect of hydrogen on the dezincification layer-induced stress and the susceptibility to SCC was investigated. Experimental results showed that the dezincification layer-induced stress increased with increasing hydrogen concentration, and 3x10-6 hydrogen could increase the susceptibility to SCC of brass in ammonia solution by 10%.

关键词： Brass Dezincification layer-induced stress Susceptibility to SCC Hydrogen