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| 1 | Microstructural evolution of Au-Sn solder prepared by laminate rolling during annealing process显示文摘The microstructural evolution and interfacial reaction of the Au/Sn/Au/Sn/Au/Sn/Au couples were investigated during annealing at 453,523,and 543 K for up to 240 h.The Au/Sn combination formed a rapid diffusion system.Even in rolled Au-Sn solder,three phases,such as AuSn,AuSn2,and AuSn4,were formed.After initial annealing at 453 K,the diffusion layers of AuSn,AuSn2,and AuSn4,which were formed after rolling,expanded gradually and then fully transformed into ζ phase(containing Sn from 10% to 18.5%,mole fraction) and δ(AuSn) phase.As a whole,the microstructure of the couple was stable during annealing at 453 K.The solid-state interfacial reaction was much faster at 523 K than at 453 K.After annealing at 523 K for 6 h,the AuSn,AuSn2,and AuSn4 were fully transformed into the ζ phase and δ phase(AuSn) .In spite of the prolonged annealing time for up to 240 h,no significant change of the interfacial microstructure occurred,and the microstructure of the couple was stable during annealing at 523 K.When annealing at 543 K,however,the interfacial of Au/Sn was transformed into solid-liquid state,and the whole couple formed a eutectic structure rapidly,causing the solder to be brittle.The study results clearly demonstrate that the service temperature of the Au-Sn solder should be lower than 543 K. | WEI Xiaofeng WANG Richu FENG Yan ZHU Xuewei PENG Chaoqun | 2011 | Rare Metals2011，30，6： | 5 |
| 2 | Effect of solidification rate on the coarsening behavior of precipitate in rapidly solidified Al-Si alloy显示文摘The gas-atomized Al-Si alloy powder with different particle sizes was subjected to isothermal annealing for understanding the effect of solidification rate on precipitation and growth Si crystals. The results show that Si precipitates grew more quickly in the small samples with a large solidification rate due to high interfacial energy. Moreover, these Si crystals had a tendency to form a quasi-spherical shape after annealing at a low temperature or for a short holding time. Coarsening of the Si precipitates during annealing was examined using a LSW equation. Thermal stability of the rapidly solidified alloy was significantly influenced by its original microstructure as a result of high solidification rate. Furthermore,more serious clustering of Si-Si phase was also observed in the small samples, attributed to the rapid coarsening of the Si phases. | Zhiyong Cai Chun Zhang Richu Wang Chaoqun Peng Ke Qiu Naiguang Wang | 2016 | Progress in Natural Science:Materials International2016，26，4： | 2 |
| 3 | Growth of BeO Nanograins Synthesized by Polyacrylamide Gel Route显示文摘BeO nanoparticles were synthesized by polyacrylamide gel route.The effects of the processing parameters on the morphology and size of the synthesized BeO nanoparticles were investigated.The calcination temperature of the gel precursor containing beryllium sulfate was determined by thermogravimetry and differential scanning calorimetry(TG-DSC),which is around 690 C and 160 C lower than the general temperature.Xray diffractometry(XRD),transmission electron microscopy(TEM),and specific surface area measurements(BET) showed that the synthesized nanoparticles under 700 C were pure,globular and about ~5-20 nm with narrow distribution.Interestingly,the nanograins coalesced and grew under higher calcination temperatures and longer calcination time.The influence of calcination temperature on the morphology and growth behavior is greater than that of its duration.The activation energy for grain growth was estimated to be 24.53 kJ/mol,and the dominant growth mechanism was most likely to be related to the vapor transport in pore control mode and grain-rotation-induced grain coalescence(GRIGC) mechanism. | Xiaofeng Wang Richu Wang Chaoqun Peng Tingting Li Bing Liu | 2011 | Journal of Materials Science & Technology2011，27，2： | 2 |
| 4 | Magnetecaloric effect of alloys Gd(Al1-xCox)2 显示文摘 | Deng Jianqiu Zhu Jinming Yah Jialin Zhuang Yinghong Wang Richu | 2007 | Journal of Rare Earths2007，25，： | 1 |
| 5 | Fabrication and properties of Si/Al interpenetrating phase composites for electronic packaging显示文摘 | Wang Xiaofeng Wu Gaohui Wang Richu | | 0，，： | 1 |
| 6 | AdGvancesin wearresistanceatmosphericplasmaperformGanceofsupersonicsprayedcoating显示文摘 | Ou Xian DengChangguang Wang Richu etal | 2013 | JouralofMaterialsReview2013，27，21： | 1 |
| 7 | EFFECT OF EXTRUSION TEMPERATURE ON PROPERTIES OF Al-Fe-X ALLOY显示文摘EFFECTOFEXTRUSIONTEMPERATUREONPROPERTIESOFAl-Fe-XALLOY￥WangRichu;LiWenxian;LiShongrui;ZenYuxiao(DepartmentofMaterialsSciencea... | Wang Richu Li Wenxian Li Shongrui Zen Yuxiao(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410c83) | 1994 | 中国有色金属学会会刊:英文版1994，4，4： | 1 |
| 8 | Plastic deformation behaviors of a Mg-Ce-Zn-Zr alloy显示文摘 | Kun Yu Wenxian Li Jun Zhao Zhengqing Ma Richu Wang | 2003 | Scripta Materialia2003，48，9： | 1 |
| 9 | Rheology of aqueous BeO suspension with NH_4PAA as a dispersant | Xiaofeng Wang Richu Wang Chaoqun Peng Haipu Li | 2012 | Progress in Natural Science:Materials International2012，22，4： | 1 |
| 10 | Production and Properties of a Spray Formed 70% Si-A1 Alloy for Electronic Packaging Applications 显示文摘 | Yu Kun Li Chao Wang Richu | 2008 | Materials Transaction JIM2008，49，3： | 1 |
| 11 | Effect of hot rolling and subsequent annealing on electrochemical discharge behavior of AP65 magnesium alloy as anode for seawater activated battery显示文摘 | Naiguang Wang Richu Wang Chaoqun Peng Yan Feng Bin Chen | 2012 | Corrosion Science2012，，： | 1 |
| 12 | Determination of isothermal sections of the Co-Nb-Ni and Ni-Mo-Re ternary systems显示文摘The isothermal sections of the Co-Nb-Ni ternary system at 1373 K and the Ni-Mo-Re ternary system at 1473 K were determined by means of diffusion triple and electron probe microanalysis(EPMA).The results indicate that there are three three-phase regions found in the Co-Nb-Ni ternary system at 1373 K:(Ni,Co) + NbCo3 + Ni3Nb,NbCo3 + NbCo2 + Ni3Nb,and NbCo2 + μ + Ni3Nb;and four three-phase regions found in the Ni-Mo-Re ternary system at 1473 K:Re + Ni + χ,Ni + NiMo + σ,σ + χ + Ni,and σ + Mo + NiMo.No ternary compound is observed in the two isothermal sections.The isothermal sections are contrasted with the previous study. | FENG Yan WANG Richu YU Kun WEN Danhua | 2008 | Rare Metals2008，27，1： | 0 |
| 13 | CARBON DIFFUSION PATHS IN Ni-Ta-C SYSTEM显示文摘TaCandTa2CareimportantcarbidesusedtostrengthenNi-basedsuperaloys.KnowledgeoftheNi-Ta-Cphasediagramandthecarbideforma-tionsequ... | Wang Richu Liu Libin Jin Zhanpeng (Department of Materials Science and Engineering, Central South University of Technology, Changsha 410083, China) | 1998 | Journal of Central South University1998，10，2： | 0 |
| 14 | MICROSTRUCTURES AND MECHANICAL PROPERTIES OF RAPIDLY SOLIDIFIED Al-Fe-Cr-Zr-V-Si ALLOY AND THEIR THERMAL STABILITY显示文摘1INTRODUCTIONThemechanicalpropertiesoftheconventionalaeronauticalhighstrengthaluminiumalloysdegeneraterapidlywhenthetemper... | Xiao, Yude Li, Songrui Li, Wenxian Wang, Richu | 1998 | 中国有色金属学会会刊:英文版1998，8，3： | 0 |
| 15 | Efficient Approach for Resource Allocation in WPCN Using Hybrid Optimization显示文摘The recent aggrandizement of radio frequency(RF)signals in wireless power transmission combined with energy harvesting methods have led to the replacement of traditional battery-powered wireless networks since the blooming RF technology provides energy renewal of wireless devices with the quality of service(QoS).In addition,it does not require any unnecessary alterations on the transmission hardware side.A hybridized global optimization technique uniting Global best and Local best(GL)based particle swarm optimization(PSO)and ant colony optimization(ACO)is proposed in this paper to optimally allocate resources in wireless powered communication networks(WPCN)through coordinated operation of communication groups,in which the wireless energy transfer and information sharing take place concomitantly by the aid of a cooperative relay positioned in between the communicating groups.The designed algorithm assists in minimizing power consumption and maximizes the weighted sum rate at the end-user side.Thus the principal target of the system is coordinated optimization of energy beamforming along with time and energy allocation to reduce the total energy consumed combined with assured information rates of the communication groups.Numerical outputs are presented to manifest the proposed system’s performance to verify the analytical results via simulations. | Richu Mary Thomas Malarvizhi Subramani | 2022 | Computers, Materials & Continua2022，，7： | 0 |
| 16 | MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A EXTRUDED RAPIDLY SOLIDIFIED AIFeVSi ALLOY显示文摘MICROSTRUCTUREANDMECHANICALPROPERTIESOFAEXTRUDEDRAPIDLYSOLIDIFIEDAIFeVSiALLOY￥Zeng,Yuxiao;Li,Songrui;Li,Wenxian;Wang,Richu;Hu... | Zeng, Yuxiao Li, Songrui Li, Wenxian Wang, Richu Hu, Miao(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083) | 1995 | 中国有色金属学会会刊:英文版1995，5，3： | 0 |
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