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Effect of micro-alloying Ca on microstructure,texture and mechanical properties of Mg-Zn-Y-Ce alloys

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Progress in Natural Science:Materials International 2020年第2期30卷 213-220页

作者： Xiaofang Liu Xianhua Chen Jianbo Li Chunquan Liu Di Zhao renju cheng Fusheng Pan International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Academy of Science and Technology Shenyang Notional Laboratory for Materials Science Chongqing University

Microstructure,texture and mechanical properties of Mg-5 Zn-0.3 Y-0.2 Ce alloys with the addition of trace xCa(x=0,0.3,0.6 wt%) were systematically investigated in this *** results revealed that more secondary eutectic phases and smaller grain size of as-cast microstructure could be found with increasing Ca *** hot extrusion,the Ca-free alloy showed a uniformly recrystallized grain structure,while the Ca-containing alloys possessed a bimodal grain structure composed of fine dynamic recrystallized(DRXed) grains with a size of several microns and un-recrystallized coarse *** analysis showed that the three extruded alloys had a fiber texture of(0001) basal plane aligned with the extrusion *** intensity of the DRXed region was weaker than the deformed *** extruded alloy with the addition of 0.6 wt% Ca exhibited the highest yield strength of 321 MPa due to the smallest DRXed grain size,the deformed region with strong basal texture and dense nanosized precipitates.

关键词： Ca micro-alloying Extrusion Microstructure Texture Mechanical properties Mg–Zn–Y–Ce alloy

High strength and ductility of cast Mg-9Gd-1.5Y-0.8Zn-0.3Zr alloy achieved by microstructural regulation

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Progress in Natural Science:Materials International 2023年第6期33卷 797-803页

作者： Daiyi Deng renju cheng Zhihua Dong Bin Jiang Mingbo Yang Haijun Wang Chuntang Yu Yanlong Ma Fusheng Pan College of Materials Science and Engineering Chongqing University of Technology College of Materials Science and Engineering Chongqing University

This work reports a high strength and ductility as-casted Mg-9Gd-1.5Y-0.8Zn-0.3Zr(wt.%) alloy by using the optimized heat treatment of a lower solid-solution temperature of 480°C and then aging at 200°C for 48 h with the ultimate tensile strength and yield strength reached 374(±2.0) MPa and 270.5(±5.5) MPa, respectively,whilst a high elongation of 10.1(±1.3) % was achieved. The high strength and ductility are found to emerged primarily from the synergic influence of long period stacking ordered(LPSO) phases and the nano-β’precipitates:at lower temperature of 480°C the alloy preserved a large number of block and lamellar 14H-LPSO phases at the grain boundaries and the smallest size of β’precipitates led to a better ductility and higher strength. While at higher temperatures solid-solution treatment of 500°C and 520°C, the strength and ductility declined slightly due to the lamellar or filminess LPSO formed in the grains, and especially the precipitation of cubic-shaped REenriched phases and rod-like Zn–Zr compounds. Particularly when the solid solution temperature reached as high as 520°C, the strength was significantly reduced due to the increase of the cubic-shaped RE-enriched phases. We suppose that the efficiency of the morphology and position of LPSO phases on the ductility strengthening of the alloy is block and lamellar LPSO phases in the grain boundaries > lamellar or filminess LPSO phases in the grains.

关键词： Mg-Gd-Y-Zn-Zr alloy High strength and ductility Magnesium alloy LPSO phase Heat treatment

Interfacial Reaction of Ti6Al4V Lattice Structure-Reinforced VW92 Alloy Matrix Composites

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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 570-576页

作者： Haijun Wang renju cheng Xianhua Chen Mingbo Yang Daiyi Deng Lirui Liu Yongfeng Zhou Yanlong Ma Kaihong Zheng Fusheng Pan College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China

A novel melting infiltration by ultrasonic vibration was investigated and applied to fabricate Ti6Al4V(TC4)lattice structure-reinforced Mg-10Gd-2Y-1Zn-xZr(refer to VW92 hereafter,x=0,0.5 wt%)alloy matrix *** edge-to-edge matching model indicates that the well-matching and possible orientation relationships(ORs)between theα-Mg andα-Ti,[10-10]_(α-Mg)//[11-23]_(α-Ti) in(0002)_(α-Mg)//(10-10)_(α-Ti) possesses the smallest misfit of 0.4%(f_(r)),and thus theα-Mg grains can nucleate on the TC4 lattice *** reaction occurred in the TC4/VW92+0.5 wt%Zr composites,and the reaction product was confirmed to be Al_(2)Zr_(3),AlZr_(2) andα-Ti(Zr)particles formed by continuous solution of *** the interfacial products,the AlZr_(2) phase is a brittle phase with high-volume fraction,which is not conducive to the load *** generally speaking,theα-Ti(Zr)and theα-Mg tend to form a coherent interface,which is beneficial for improving the interfacial bonding strength of composites.

关键词： TC4 VW92 composites TC4 lattice structure Interfacial reaction Mismatch

Strain hardening behavior of Mg-Y alloys after extrusion process

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Journal of Magnesium and Alloys 2019年第4期7卷 672-680页

作者： Chaoyue Zhao Ziyan Li Jiahui Shi Xianhua Chen Teng Tu Zhu Luo renju cheng Andrej Atrens Fusheng Pan The State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400045China Chongqing Academy of Science and Technology Chongqing 401123China School of Mechanical and Mining Engineering The University of QueenslandSt Lucia4072 QldAustralia

The strain hardening is an effective mode of enhancing mechanical properties in *** this work,the strain hardening behaviors of Mg-xY(x=1,2,and 3 wt%)after extrusion process was investigated using uniaxial tensile *** suggest that the Mg-xY alloys are composed ofα-Mg with a little amount of Mg24Y5 *** average grain size reduces from 19.8μm to 12.2μm as the Y content adds from 1 wt%to 2 wt%.Nevertheless,when Y content reaches 3 wt%,the grain size reaches to 12.9μm,which is close to that of *** strain hardening rate decreases from 883 MPa to 798 MPa at(σ-σ0.2)=40 MPa,and Mg-2Y and Mg-3Y have the similar strain hardening ***,Mg-1Y shows an obvious ascending stage after the steep decreasing stage,which is mainly caused by the activation of *** strain hardening behavior of Mg-xY is explained based on understanding the roles of the deformation mechanisms via deformation microstructure analysis and Visco-Plastic Self Consistent(VPSC)*** variation of strain hardening characteristics with increasing Y content is related to the effects of grain size and texture.

关键词： Mg-Y alloy Strain hardening Texture Twinning VPSC

Sr和Sb变质AZ61-0．7Si合金的铸态组织和力学性能

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稀有金属材料与工程 2008年第10期37卷 1737-1741页

作者：杨明波潘复生程仁菊赵玮霖重庆工学院重庆400050 重庆大学重庆400030

Mg2Si相的变质和细化被认为是改善含Si镁合金力学性能的关键因素之一。研究了Sr和Sb变质AZ61-0.7Si镁合金的铸态组织和力学性能。研究结果表明:添加0.4%(质量分数)Sb对AZ61-0.7Si镁合金中的汉字状Mg2Si相有一定细化作用,但没有明显变质... 详细信息

Mg2Si相的变质和细化被认为是改善含Si镁合金力学性能的关键因素之一。研究了Sr和Sb变质AZ61-0.7Si镁合金的铸态组织和力学性能。研究结果表明:添加0.4%(质量分数)Sb对AZ61-0.7Si镁合金中的汉字状Mg2Si相有一定细化作用,但没有明显变质效果。相反,添加微量Sr对AZ61-0.7Si合金中的汉字状Mg2Si相有明显变质和细化作用。在AZ61-0.7Si合金中添加0.03%～0.09%Sr(质量分数)后,合金中的Mg2Si相从粗大汉字状形貌变为细小的颗粒状和/或多边形状。相应地,合金的抗拉性能和蠕变性能得到显著提高。

关键词：镁合金 AZ61—0.7Si合金 Sr元素 Sb元素 Mg2Si相

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我国锂辉石矿选矿技术研究现状及展望

矿产综合利用 2021年第5期42卷 1-8页

作者：李成秀程仁举刘星中国地质科学院矿产综合利用研究所中国地质调查局金属矿产资源综合利用技术研究中心四川成都610041

锂辉石矿高效选矿是锂资源开发利用产业重要的一环。本文主要介绍了锂辉石矿选矿工艺和浮选药剂的研究现状及发展趋势。联合选矿法是当前选别锂多金属矿的主要工艺,开发新型高效捕收剂是提高锂辉石浮选指标的有效手段。加大联合工艺研究... 详细信息

锂辉石矿高效选矿是锂资源开发利用产业重要的一环。本文主要介绍了锂辉石矿选矿工艺和浮选药剂的研究现状及发展趋势。联合选矿法是当前选别锂多金属矿的主要工艺,开发新型高效捕收剂是提高锂辉石浮选指标的有效手段。加大联合工艺研究,注重绿色环保耐低温浮选药剂的开发与应用是锂辉石矿选矿发展的重要方向。

关键词：锂辉石矿选矿工艺浮选药剂

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川西某伟晶岩型锂辉石矿浮选试验研究

矿产综合利用 2020年第6期41卷 153-157页

作者：程仁举李成秀刘星邓伟周雄中国地质科学院矿产综合利用研究所中国地质调查局金属矿产资源综合利用技术研究中心中国地质调查局稀土资源应用技术创新中心四川成都610041

川西某伟晶岩型锂多金属矿主要目的矿物为锂辉石,伴生有少量的铌钽铁矿,脉石矿物主要有长石,石英和云母类矿物。在磨矿细度-0.074 mm 72%的条件下,采用一粗一扫三精的浮选闭路流程,最终获得了Li_2O品位5.80%、Nb_2O_5含量530 g/t、Ta_2... 详细信息

川西某伟晶岩型锂多金属矿主要目的矿物为锂辉石,伴生有少量的铌钽铁矿,脉石矿物主要有长石,石英和云母类矿物。在磨矿细度-0.074 mm 72%的条件下,采用一粗一扫三精的浮选闭路流程,最终获得了Li_2O品位5.80%、Nb_2O_5含量530 g/t、Ta_2O_5含量215 g/t的含铌钽锂精矿,Li_2O回收率为91.76%,Nb_2O_5回收率为91.05%、Ta_2O_5回收率为90.83%,实现了锂铌钽的混合浮选。

关键词：锂辉石铌钽铁矿浮选捕收剂

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Sr对ZK60镁合金晶粒细化的影响

北京科技大学学报 2008年第12期30卷 1397-1401页

作者：程仁菊潘复生杨明波汤爱涛重庆大学材料科学与工程学院重庆400030 重庆工学院材料科学与工程学院重庆400050

用金相显微分析、扫描电镜分析及能谱分析等方法研究了Sr对ZK60镁合金晶粒细化的影响.结果表明:添加少量的Sr对ZK60镁合金有很好的组织细化效果,但其细化效率受Sr加入量和熔体保温时间的影响较大.在给定熔体保温时间的条件下,随着Sr质... 详细信息

用金相显微分析、扫描电镜分析及能谱分析等方法研究了Sr对ZK60镁合金晶粒细化的影响.结果表明:添加少量的Sr对ZK60镁合金有很好的组织细化效果,但其细化效率受Sr加入量和熔体保温时间的影响较大.在给定熔体保温时间的条件下,随着Sr质量分数从0.01%增加到0.1%,晶粒细化效率逐渐提高.在给定Sr加入量的条件下,当熔体保温时间为20～80min时,晶粒细化效率随熔体保温时间的延长而提高;当熔体保温时间超过80min后,晶粒细化效率随熔体保温时间的延长而降低.

关键词： ZK60镁合金锶中间合金晶粒细化

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锶在镁合金中的应用及其研究新进展

材料导报 2008年第5期22卷 63-67页

作者：程仁菊潘复生杨明波汤爱涛重庆大学材料科学与工程学院重庆400030 重庆工学院材料科学与工程学院重庆400050

综述了锶对镁合金组织和性能的影响以及Mg-Al-Sr耐热镁合金开发的研究概况,分析了锶对镁合金组织的细化和变质机理。研究表明,锶是对镁合金组织和性能有益的合金元素,主要体现在细化和变质合金的组织、减少铸造缺陷的产生、提高合金高... 详细信息

综述了锶对镁合金组织和性能的影响以及Mg-Al-Sr耐热镁合金开发的研究概况,分析了锶对镁合金组织的细化和变质机理。研究表明,锶是对镁合金组织和性能有益的合金元素,主要体现在细化和变质合金的组织、减少铸造缺陷的产生、提高合金高温下的机械性能。此外,指出了目前还存在的问题,并对今后的发展进行了展望。

关键词：镁合金锶晶粒细化 Mg-Al-Sr耐热镁合金