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Journal of Materials Science & Technology 2022年第33期128卷 22-30页

作者： Weizong Bao Jie Chen Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

A superiority in interfacial bonding is favorable to fabricate high-strength conductive composites for electrical contact applications.In the present work,high strength and high conductivity multi-scale metallic glass composites(including micron-scale Cu Zr Al metallic glass reinforcement,hundred-nanometer-scale Cu Cr Zr crystalline grain matrix,and nano-scale precipitated phase)were fabricated by a one-step spark plasma sintering(SPS).The strength and conductivity of the bulk copper matrix metallic glass composites(BCMGCs)were enhanced simultaneously with the increase in the sintering pressure of the SPS.The excellent performance is attributed to the improved interfacial bonding between the metallic glass reinforcement and the copper alloy matrix due to the high pressure assisted by temperature and pulsed current.In particular,the precipitation of nanoprecipitates at the interface further reduces the interfacial resistance and improves the mechanical properties of the composites.This work broadens the horizon for the selection and optimization of reinforcements and manufacturing processes for high-performance electrical contact materials(ECMs).

关键词： CuZrAl metallic glass Spark plasma sintering Mechanical properties Electrical performance

Fabrication of porous TiZrNbTa high-entropy alloys/Ti composite with high strength and low Young’s modulus using a novel MgO space holder

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Journal of Materials Science & Technology 2023年第36期167卷 59-73页

作者： Tao Xiang Jie Chen Weizong Bao Shuyan Zhong Peng Du Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Stress shielding is caused by the mismatch of stiffness between bone and implant materials,which may give rise to bone resorption and loosening,thereby causing implantation failure.There is a huge gap between Young’s modulus of human bone and low Young’s modulusβTi alloys.A porous structure design can achieve the target of low Young’s modulus,and thus achieve the matching between human bone and implant materials.However,a suitable space holder(SH)that can be applied at high temperatures and sintering pressure has not been reported.In this study,the TiZrNbTa/Ti titanium matrix composite(TMC)with high strength and large ductility was used as scaffold materials and combined the SH technique with the spark plasma sintering(SPS)technique to obtain a porous structure.A novel space holder,i.e.,MgO particles was adopted,which can withstand high-temperature sintering accompanied by a sintering pressure.The porous TiZrNbTa/Ti with 40 vol.%MgO added exhibits a maximum strength of 345.9±10.4 MPa and Young’s modulus of 24.72±0.20 GPa,respectively.It possesses higher strength compared with human bone and matches Young’s modulus of human bone,which exhibits great potential for clinical application.

关键词： TiZrNbTa/Ti titanium matrix composite MgO space holder Low Young’s modulus High strength

Phase-tunable equiatomic and non-equiatomic Ti-Zr-Nb-Tahigh-entropy alloys with ultrahigh strength for metallic biomaterials

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Journal of Materials Science & Technology 2022年第22期117卷 196-206页

作者： Tao Xiang Peng Du Zeyun Cai Kun Li Weizong Bao Xinxin Yang Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The contradiction between the strength and ductility of metallic materials is a major scientific problemthat has been researched for a long time. Dual-phase equiatomic and non-equiatomic Ti-Zr-Nb-Ta highentropy alloys (HEAs) with super-high strength and excellent ductility have been successfully developedvia mechanical alloying (MA) combined with spark plasma sintering (SPS) technology. This is adjustedby altering the atomic ratios of the different phases. X-ray diffraction (XRD) and transmission electronmicroscopy (TEM) were performed to confirm the dual-phase microstructure. After the SPS process, theaverage grain size of the aforementioned equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs (134 ± 50 nm) evaluated byelectron back-scattering diffraction (EBSD) is smaller than that of the Ti-Zr-Nb-Ta HEAs (150 μm), whichwere fabricated using arc melting. According to the Hall-Petch formula, the grain boundary strengthening contribution in the Ti-Zr-Nb-Ta system is 33-fold higher than those fabricated using the arc-meltingprocess. When the alloy phase comprises the equivalent dual-phase, equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAshave good comprehensive performance compared to non-equiatomic Ti-Zr-Nb-Ta HEAs prepared usingthe same process. The yield strength of equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs (2212 ± 38 MPa) is two-foldhigher than that of Ti-Zr-Nb-Ta HEAs (1100 ± 90 MPa) fabricated via arc melting. This can be attributed tothe ultra-fine grain size. Notably, the equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs possess approximately the samebiocompatibility as commercial pure Ti (CP-Ti), indicating that the equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs areprovided with a possibility as an advanced biomaterial for the applications of the medical field.

关键词： Equiatomic Nb_(25)Ta_(25)Ti_(25)Zr_(25)HEAs Ultra-fine grain Phase-tunable Mechanical properties Biocompatibility

Laboratory Study on CR/SBS Modified Asphalt:Preparation and Performance Characterization

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Journal of Renewable Materials 2022年第6期10卷 1659-1674页

作者： Liang Song guoqiang Zhang Hongfei xie Jie Gao College of Transportation Engineering Tongji UniversityShanghai201804China Xinjiang Transportation Planning Surveying and Design Institute Urumqi830006China Xinjiang NABA Expressway Development Co. Ltd.Urumqi830006China School of Civil Engineering and Architecture East China Jiaotong UniversityNanchang330013China

Crumble rubber(CR)can be used to prepare CR and styrene-butadiene-styrene(SBS)composite modified asphalt with a good high-and low-temperature performance,meanwhile the addition of CR could work as the substitute for SBS and help reduce the content of SBS.This study contains three main parts:effect of preparation and effect of material composition as well as rheological performance characterization.Factors during the preparation,including shearing temperature,shearing time,mixing time and swelling time,were selected,while base binder,CR content,CR particle size and SBS content in material composition were considered.The effects of these factors were assessed in terms of the conventional performance(penetration,softening point,ductility and storage stability).After identifying these effects,the sample of CR and SBS modified asphalt at the selected preparing condition and material composition(CR/SBSMA)was made,and the corresponding SBS modified and CR modified asphalt(SBSMA and CRMA)were produced for the comparing reason.Subsequently,temperature sweeps from 0℃ to 80℃ were utilized to depict the viscoelasticity of these modified asphalt binders by complex modulus and phase angle.Multiple stress creep recovery tests(MSCR)at 64℃ and bending beam rheometer tests(BBR)at various low temperatures were employed to evaluate the high-and low-temperature performance,respectively.Results highlight that that CR/SBSMA could exhibit an excellent high-temperature performance(better than SBSMA),and a good low-temperature performance(reaching the level of base binder).

关键词： Crumble rubber styrene-butadiene-styrene preparation material composition high-temperature performance low-temperature performance

Optimization of mechanical properties and corrosion resistance of Zn-0.4Mn-0.8Li alloy using the hot rolling process

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Journal of Materials Science & Technology 2023年第14期145卷 136-147页

作者： Xinxin Yang Peng Du Kun Li Weizong Bao Tao Xiang Jie Chen Xingjun Liu Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Zinc-based degradable metals are considered one of the most promising biodegradable materials due to their moderate corrosion rate,excellent mechanical properties,and good biocompatibility.In this work,biodegradable Zn-0.4Mn-0.8Li alloy was fabricated and rolled in multiple passes at different tem peratures.As the hot rolling temperature increases,the grain size of Zn-0.4Mn-0.8Li alloy was found to increase cor-respondingly.Further,a multi-scale structure with the coexistence of coarse grains and fine grains was obtained.The results demonstrated that the mechanical strength and corrosion resistance were improved by increasing the rolled temperature.It was observed that Zn-0.4Mn-0.8Li alloy with a total reduction of 90%after hot rolling at 325℃ exhibited excellent mechanical and corrosion properties.The cooperation of multi-scale microstructure and twinning was found to improve the strength and guarantee the duc-tility of Zn-0.4Mn-0.8Li alloy significantly so that the 325℃ hot-rolled Zn-0.4Mn-0.8Li alloy has optimal comprehensive properties.Further,yield strength,ultimate tensile strength,and elongation were found to be 449.7±5.3 MPa,505.1±6.5 MPa,and 40.5%±7.5%,respectively.Meanwhile,Zn-0.4Mn-0.8Li al-loy via 325℃ hot-rolled processes also exhibited excellent corrosion resistance.The corrosion current density and corrosion potential were found to be 8.8×10-5 mA cm^(-2)and−0.929 V,respectively.The preliminary study indicates that Zn-0.4Mn-0.8Li alloy is a promising candidate material for medical de-vice applications.

关键词： Zn-based degradable metal Hot rolling Mechanical property Corrosion behavior

Dual phase equal-atomic NbTaTiZr high-entropy alloy with ultra-fine grain and excellent mechanical properties fabricated by spark plasma sintering

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Journal of Materials Science & Technology 2021年第31期90卷 150-158页

作者： Tao Xiang Zeyun Cai Peng Du Kun Li Zongwei Zhang Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Super-high strength NbTaTiZr high-entropy alloys(NbTaTiZr HEAs)have been successfully fabricated by the mechanical alloying(MA)with spark plasma sintering(SPS)technology,which is 2-fold compared with that of NbTaTiZr HEAs prepared by vacuum arc melting(VAM).After the SPS process,the bulk NbTaTiZr alloy samples are provided with dual-phase body-centered cubic(BCC)structure and nanoscale grain size about 500 nm that is obviously smaller than that of NbTaTiZr HEA fabricated by VAM.When the sintering temperature is 800℃,the compressive fracture strength is the highest reaching at 2511±78 MPa.When the sintering temperature is 1000℃,the fracture strain is the highest reaching at 12.8%,and compressive fracture strength and yield strength also reach at 2274±91 MPa and 2172±47 MPa,respectively.The excellent mechanical properties of bulk NbTaTiZr alloy samples are attributed to the merits of MA and SPS,and the collaboration effect of ultra-fine grains strengthening,solid solution strengthening and interstitial solid solution strengthening.

关键词： NbTaTiZr high-entropy alloys Mechanical alloying Ultra-fine grain Spark plasma sintering Mechanical properties Corrosion behavior

Mechanical properties and corrosion resistance of powder metallurgical Mg-Zn-Ca/Fe bulk metal glass composites for biomedical application

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Journal of Materials Science & Technology 2022年第8期103卷 73-83页

作者： Kun Li Luxin Liang Peng Du Zeyun Cai Tao Xiang Hiroyasu Kanetaka Hong Wu Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Graduate School of Biomedical Engineering Tohoku UniversitySendai980-8579Japan Graduate School of Dentistry Tohoku UniversitySendai 980-8575Japan State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Magnesium(Mg)alloys can be regarded as the most promising biodegradable implant materials for orthopedic and stent applications due to their good biocompatibility and low Young’s modulus which is near to that of natural bone.However,its applicability is hindered because it exhibits a high corrosion rate in the physiological environments.In this work,we fabricated Mg_(66)Zn_(30)Ca_(4)/Fe bulk metallic glass composites via spark plasma sintering(SPS).We studied the influence of different contents of Fe on the properties of the composites.The results indicated that Fe was uniformly distributed on the surface of Mg_(66)Zn_(30)Ca_(4) metallic glass(MG)as a second phase,which led to an improvement in the corrosion resistance and mechanical strength.The standard potential of Mg_(66)Zn_(30)Ca_(4)/Fe bulk metallic glass(BMG)composites increased as compared to Mg_(66)Zn_(30)Ca_(4),while their mechanical strength improved from 355 MPa to 616 MPa.Furthermore,cytotoxicity was investigated via the CCK-8 assay and calcein-AM staining,which revealed that the extraction mediums diluted 6 times(EM×6)of the Mg_(66)Zn_(30)Ca_(4) and Mg_(66)Zn_(30)Ca_(4)/Fe did not cause cell toxicity on day 3 and 5,while the EM×6 of the Mg_(66)Zn_(30)Ca_(4) showed cytotoxicity on day 1,3 and 5.Thus,Mg_(66)Zn_(30)Ca_(4)/Fe BMG composites exhibit significant potential for fabricating implants with good mechanical strength and corrosion resistance.

关键词： Mg_(66)Zn_(30)Ca_(4)/Fe bulk metallic glass composites Spark plasma sintering Corrosion behaviour Mechanical strength

Spatiotemporally mode-locked soliton fiber laser at 2.8µm

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High Power Laser Science and Engineering 2023年第5期11卷 93-97页

作者： Ying’an Chen Yicheng Zhou Zhipeng Qin Guoqiang Xie Peng Yuan Jingui Ma Liejia Qian School of Physics and Astronomy Key Laboratory for Laser Plasmas(Ministry of Education)Collaborative Innovation Center of IFSA(CICIFSA)Shanghai Jiao Tong UniversityShanghaiChina

Spatiotemporal mode-locking creates great opportunity for pulse energy scaling and nonlinear optics research in fiber.Until now,spatiotemporal mode-locking has only been realized in normal-dispersion dissipative soliton and similariton fiber lasers.In this paper,we demonstrated the first experimental realization of a spatiotemporally mode-locked soliton laser in mid-infrared fluoride fiber with anomalous dispersion.The mode-locked fluoride fiber oscillator directly generated a record pulse energy of 16.1 nJ and peak power of 74.6 kW at 2.8µm wavelength.This work extends the spatiotemporal mode-locking to soliton fiber lasers and should have a wide interest for the laser community.

关键词： mid-infrared soliton fiber laser spatiotemporal mode-locking

Temporal-filtering dissipative soliton in an optical parametric oscillator

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High Power Laser Science and Engineering 2022年第2期10卷 80-86页

作者： Hui Tong Fuyong Wang Zhipeng Qin Guoqiang Xie Liejia Qian School of Physics and Astronomy Key Laboratory for Laser Plasmas(Ministry of Education)Collaborative Innovation Center of IFSA(CICIFSA)Shanghai Jiao Tong UniversityShanghai 200240China School of Information and Electrical Engineering Hebei University of EngineeringHandan 056038China

Dissipative solitons have been realized in mode-locked fiber lasers in the theoretical framework of the Ginzburg±Landau equation and have significantly improved the pulse energy and peak power levels of such lasers.It is interesting to explore whether dissipative solitons exist in optical parametric oscillators in the framework of three-wave coupling equations in order to substantially increase the performance of optical parametric oscillators.Here,we demonstrate a temporalfiltering dissipative soliton in a synchronously pumped optical parametric oscillator.The temporal-gain filtering of the pump pulse combined with strong cascading nonlinearity and dispersion in the optical parametric oscillator enables the generation of a broad spectrum with a nearly linear chirp;consequently,a significantly compressed pulse and high peak power can be realized after dechirping outside the cavity.Furthermore,we realized,for the first time,dissipative solitons in an optical system with a negative nonlinear phase shift and anomalous dispersion,extending the parameter region of dissipative solitons.The findings may open a new research block for dissipative solitons and provide new opportunities for mid-infrared ultrafast science.

关键词： cascading nonlinearity dissipative solitons optical parametric oscillators temporal filtering

Grating-free 2.8μm Er:ZBLAN fiber chirped pulse amplifier

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High Power Laser Science and Engineering 2022年第6期10卷 60-65页

作者： Yicheng Zhou Zhipeng Qin Xiabing Zhou Guoqiang Xie School of Physics and Astronomy Key Laboratory for Laser Plasmas(Ministry of Education)Collaborative Innovation Center of IFSA(CICIFSA)Shanghai Jiao Tong UniversityShanghaiChina

We report on a grating-free fiber chirped pulse amplifier(CPA)at 2.8μm for the first time.The CPA system adopted Er:ZBLAN fiber with large anomalous dispersion as the stretcher and germanium(Ge)rods as the compressor with a compact structure.High-energy picosecond pulses of 2.07μJ were generated at the repetition rate of 100 kHz.Using highly dispersive Ge rods,the amplified pulses were compressed to 408 fs with a pulse energy of 0.57μJ,resulting in a peak power of approximately 1.4 MW.A spectral broadening phenomenon in the main amplifier was observed,which was caused by the special gain shape of the Er:ZBLAN fiber amplifier in operation and confirmed by our numerical simulation.This compact fiber CPA system at 2.8μm will be practical and meaningful for application fields.

关键词： Er:ZBLAN fiber fiber chirped pulse amplifier grating free mid-infrared