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Electron beam surface heating-diffusion bonding:An effective joining method for aluminum alloy metal-matrix composite with high SiC volume

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Journal of Materials Science & Technology 2021年第29期88卷 109-118页

作者： Guoqing Chen Qianxing Yin Jian Cao Ge Zhang Gongbo Zhen Binggang Zhang State Key laboratory of Advanced welding and Joining Harbin Institute of TechnologyHarbin150001China

As a novel method to reduce the temperature during electron beam welding,and to subsequently inhibit interfacial reaction between SiC and Al matrix,the electron beam surface heating-diffusion bonding is proposed for joining SiC particle reinforced aluminum alloy metal-matrix composite of 45 vol.%SiC/2024 *** defocused electron beam was used to heat the base metal surface,and the simultaneous pressure was applied to the butt surface to achieve *** base metals were successfully joined by *** maximum temperature of the whole joint was effectively decreased to less than 650°*** Gibbs free energy change of interfacial reaction was calculated,meaning a positive value reaching 218 kJ/mol and a consequently prominent inhibitory effect on the formation of brittle Al_(4)C_(3)that was proved by microstructural *** tensile strength for the bonded joint was increased by 35%compared to that for ordinary welded *** the TC4 layer was added,TiC strengthening particles were formed with the deficiency of Al_(4)C_(3),corresponding to the significantly increased tensile strength of 63%of base metal(154 MPa).

关键词： 45 vol.%SiC/2024 Al Electron beam surface heating-diffusion bonding Interfacial reaction inhibition Gibbs free energy change

Microstructure and mechanical properties of GTA-based wire arc additive manufactured AZ91D magnesium alloy

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Journal of Magnesium and Alloys 2024年第8期12卷 3180-3192页

作者： Xiaoyu Cai Fukang Chen Bolun Dong Sanbao Lin Chunli Yang State Key laboratory of Advanced welding and Joining Harbin Institute of TechnologyHarbin 150001China

Wire arc additive manufacturing offers advantages in producing large metal *** current research on GTA-based wire arc additive manufacturing(GTA-WAAM)of magnesium alloys is focused on deformed magnesium alloys,mainly on the Mg-Al alloy ***,there is little research on GTA-WAAM for casting magnesium *** study investigates the microstructural characteristics and mechanical properties of AZ91D magnesium alloy(AZ91D-Mg)deposited by ***-pass multilayer thin-walled components were successfully *** results show that equiaxed grains dominate the microstructure of the deposited *** the remelting process,the precipitated phases dissolve into the matrix,and they precipitate and grow from the matrix under the thermal effect of the subsequent thermal *** mechanical properties in the vertical and horizontal directions are similar,showing higher overall mechanical properties than the casting *** average yield strength is 110.5 MPa,the ultimate tensile strength is 243.6 MPa,and the elongation is 11.7%.The overall hardness distribution in the deposited sample is relatively uniform,and the average microhardness is 59.6 HV_(0.2).

关键词： GTA Additive manufacturing AZ91D magnesium alloy Microstructure Mechanical properties

One-step PDA coating strategy on pure Zn for blood-contacting engineering

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Journal of Materials Science & Technology 2022年第28期123卷 78-91页

作者： Xiaoyun Qi Shicheng Zhou Hui Fang Shuhan Yang Chunjin Hang Yanhong Tian Chenxi Wang State Key laboratory of Advanced welding and Joining Harbin Institute of TechnologyHarbin 150001China

The mechanical performance degradation caused by pitting corrosion and the insufficient biocompatibility induced with ion release inhibit the application of Zn as the new biodegradable metallic materials for blood-contacting intervention *** work successfully coats a uniform polydopamine(PDA)layer on pure Zn via a one-step deposition process without introducing heavy metal elements or detrimental *** corrosion resistance and uniform corrosion have been performed on PDA coated Zn with corrosion products and pits reduced significantly than pure Zn during in vitro *** could be prohibited by anticoagulation performance with prothrombin time and activated partial thromboplastin time prolonged after co-incubation,and an almost 40%decrease of platelets adhesion,indicating the improved blood compatibility of coated ***,the poly(lactic-co-glycolic acid)(PLGA)is filmed on PDA coated Zn to realize a smooth double-coated structure with superior mechanical performance under stress loading to stably serve the multifunctional application,such as drug *** strategy not only represents a facile and biological friendly method for Zn surface modification but also puts forward new ideas on preparing PDA-based coatings on active biodegradable alloys,which are beneficial for better blood-contacting engineering.

关键词： Biodegradable Pure Zn Uniform corrosion Blood compatibility Doubled-coated structure

Microstructure Evolutions and Properties of Al-Cu Alloy Joint in the Pulsed Power Ultrasonic-Assisted GMAW

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Acta Metallurgica Sinica(English Letters) 2020年第10期33卷 1397-1406页

作者： Chao Chen Chenglei Fan Zeng Liu Xiaoyu Cai Sanbao Lin Yimin Zhuo State Key laboratory of Advanced welding and Joining Harbin Institute of TechnologyHarbin 150001China

The pulsed power ultrasonic-assisted gas metal arc welding(PU-GMAW)is a new development hybrid welding *** influences of the pulsed power ultrasonic on the microstructure evolution of the welded joint of Al-Cu alloy were investigated by using scanning electron microscopy,transmission electron microscope and electron back scattering *** results showed that the efficient heat input in the PU-GMAW was increased by above 100%compared with the traditional *** grain and eutectic of the PU-GMAW weld seam were refined compared with that of the *** and acoustic streaming induced the dendrite fragmentation(α-Al)and heterogeneous nucleation,which were the main reasons for the grain *** microhardness of the PU-GMAW welded joint was improved compared with that of the GMAW owing to the change of the eutectic and grain.

关键词： Pulsed power ultrasonic Al-Cu alloy Microstructure Cavitation Acoustic streaming

An additively manufactured Al-14.1Mg-0.47Si-0.31Sc-0.17Zr alloy with high specific strength,good thermal stability and excellent corrosion resistance

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Journal of Materials Science & Technology 2021年第8期67卷 23-35页

作者： Jiang Bi Zhenglong Lei Yanbin Chen Xi Chen Nannan Lu Ze Tian Xikun Qin State Key laboratory of Advanced welding and Joining Harbin Institute of TechnologyHarbin 150001China

A novel Al-14.1 Mg-0.47 Si-0.31 Sc-0.17 Zr alloy was applied in the printing process of selective laser melting(SLM),and the corresponding microstructural feature,phase identification,tensile properties and corrosion behavior of the Al Mg Si Sc Zr alloy were studied in *** fabricated at 160 W and 200 mm/s,the Mg content of bulk sample decreased to 11.7 wt%due to the element vaporization at high energy density,and the density of this additively manufactured Al Mg Si Sc Zr alloy was 2.538 g/cm^(3),which is4.2%8.5%lighter than that of other SLM-processed Al *** heat-treated(HT)at 325℃and 6 h,the microstructure was almost unchanged with an alternate distribution of fine equiaxed crystals and coarse columnar ***-sized Al3(Sc,Zr)and Mg_(2)Si phases precipitated dispersedly in the Al matrix,and the tensile strength increased from 487.6 MPa to 578.4 MPa for precipitation strengthening and fine grain *** a fine grain size of 2.53μm,an excellent corrosion resistance was obtained for the as-printed(AP)Al Mg Si Sc Zr *** the corrosion resistance of HT sample decreased slightly for the formation of non-dense oxide layer and pitting corrosion induced by diffuse precipitation *** SLM-printed Al Mg Si Sc Zr alloy with high specific strength,good thermal stability and excellent corrosion resistance has broad prospects for the aerospace and automotive applications.

关键词： Additive manufacturing AlMgSiScZr alloy Microstructural feather Specific strength Corrosion resistance Thermal stability

Additively Manufactured Flexible Electronics with Ultrabroad Range and High Sensitivity for Multiple Physiological Signals'Detection

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Research 2022年第4期2022卷 707-717页

作者： Huanhuan Feng Yaming Liu Liang Feng Limeng Zhan Shuaishuai Meng Hongjun Ji Jiaheng Zhang Mingyu Li Peng He Weiwei Zhao Jun Wei Sauvage laboratory for Smart Materials Shenzhen Key Laboratory of Flexible Printed Electronics TechnologyHarbin Institute of Technology(Shenzhen)China State Key laboratory of Advanced welding and Joining(Shenzhen) Harbin Institute of Technology(Shenzhen)China State Key laboratory of Advanced welding and Joining Harbin Institute of TechnologyChina

Flexible electronics can be seamlessly attached to human skin and used for various purposes, such as pulse monitoring, pressure measurement, tensile sensing, and motion detection. Despite their broad applications, most flexible electronics do not possess both high sensitivity and wide detection range simultaneously;their sensitivity drops rapidly when they are subjected to even just medium pressure. In this study, ultrabroad-range, high-sensitivity flexible electronics are fabricated through additive manufacturing to address this issue. The key to possess high sensitivity and a wide detection range simultaneously is to fabricate flexible electronics with large depth-width ratio circuit channels using the additive manufacturing inner-rinsing template method. These electronics exhibit an unprecedented high sensitivity of 320 kPa^(−1) over the whole detection range, which ranges from 0.3 to 30,000 Pa (five orders of magnitude). Their minimum detectable weight is 0.02 g (the weight of a fly), which is comparable with human skin. They can stretch to over 500% strain without breaking and show no tensile fatigue after 1000 repetitions of stretching to 100% strain. A highly sensitive and flexible electronic epidermal pulse monitor is fabricated to detect multiple physiological signals, such as pulse signal, breathing rhythm, and real-time beat-to-beat cuffless blood pressure. All of these signals can be obtained simultaneously for detailed health detection and monitoring. The fabrication method does not involve complex expensive equipment or complicated operational processes, so it is especially suitable for the fabrication of large-area, complex flexible electronics. We believe this approach will pave the way for the application of flexible electronics in biomedical detection and health monitoring.

关键词： fatigue additive stretching

Optimization of cold spray additive manufactured AA2024/Al_(2)O_(3) metal matrix composite with heat treatment

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Journal of Materials Science & Technology 2022年第11期106卷 211-224页

作者： Dong Wu Wenya Li Kun Liu Yang Yang Sijie Hao State Key laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi’an 710072China

In this study,the effects of annealing and solution aging heat treatment on the microstructure and mechanical properties of cold spray additive manufactured(CSAMed)AA2024/Al_(2)O_(3) composite were *** results showed that both annealing and solution aging enhanced the interfacial bonding between the deposited AA2024 particles in the *** tensile properties of CSAMed AA2024/Al_(2)O_(3) composite were significantly improved by 13.8%for ultimate tensile strength and 47.8%for elongation after solution *** examination and fractographic analysis showed that the fracture mechanism between the adjacent AA2024 particles changed from brittle to ductile-dominant mode after heat ***,the interfacial bonding between the AA2024 and Al_(2)O_(3) particles cannot be *** the improvement of mechanical properties,the solution aging was slightly better than *** addition,low-temperature annealing greatly reduced the anisotropy of the mechanical properties of CSAMed AA2024/Al_(2)O_(3) composite.

关键词： Cold spray additive manufacturing Aluminum matrix composite Mechanical property Heat treatment

Microstructural Evolution and Mechanical Properties of Inconel 625 Alloy during Pulsed Plasma Arc Deposition Process

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Journal of Materials Science & Technology 2013年第5期29卷 480-488页

作者： Fujia Xu Yaohui Lv Yuxin Liu Fengyuan Shu Peng He Binshi Xu State Key laboratory of Advanced welding and Joining Harbin Institute of Technology National Key laboratory for Remanufacturing Academy of Armored Forces Engineering

Pulsed plasma arc deposition （PPAD）, which combines pulsed plasma cladding with rapid prototyping, is a promising technology for manufacturing near net shape components due to its superiority in cost and convenience of processing. In the present research, PPAD was successfully used to fabricate the Ni-based superalloy Inconel 625 components. The microstructures and mechanical properties of deposits were investigated by scanning electron microscopy （SEM）, optical microscopy （OM）, transmission electron microscopy （TEM） with energy dispersive spectrometer （EDS）, microhardness and tensile testers. It was found that the as-deposited structure exhibited homogenous columnar dendrite structure, which grew epitaxially along the deposition direction. Moreover, some intermetallic phases such as Laves phase, minor MC （NbC, TiC） carbides and needle-like δ-Ni3Nb were observed in y-Ni matrix. Precipitation mechanism and distribution characteristics of these intermetallic phases in the as-deposited 625 alloy sample were analyzed. In order to evaluate the mechanical properties of the deposits, microhardness was measured at various location （including transverse plane and longitudinal plane）. The results revealed hardness was in the range of 260- 285 HVo.2. In particular, microhardness at the interface region between two adjacent deposited layers was slightly higher than that at other regions due to highly refined structure and the disperse distribution of Laves particles. Finally, the influence of precipitation phases and fabrication strategies on the tensile properties of the as-deposited samples was investigated. The failure modes of the tensile specimens were analyzed with fractography.

关键词： Pulsed plasma arc deposition Inconel 625 components Microstructure Mechanical properties

Solder Anisotropic Conductive Films for Prospective Wearable and 5G/Artificial Electronics

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材料导报 2020年第14期34卷 14001-14002页

作者： ZHANG Shuye State Key laboratory of Advanced welding and Joining Harbin Institute of TechnologyHarbin 150001China

Wearable electronics in future necessarily assemble integrated circuits(ICs)on printed circuit board(PCB)or flexible printed circuit(FPC)substrates[1].Before that,flex-on-board(FOB)assembly is to attach thin-film adhesives between rigid and flexible substrates in current wearable electronics,such as smart watches[2].FOB is an alternative interconnection for the conventio-nal socket-type interconnection[3],by achieving a thinner package size,a higher electrical property,a fine-pitch capability and a higher long-term reliability[4].

关键词： interconnection Anisotropic socket