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| 1 | 镁合金塑性加工技术发展及应用显示文摘我国是世界上镁资源最为丰富的国家,镁及镁合金具有质轻、比强度高、阻尼减振、电磁屏蔽性能优良、储能特性好等优点,是最有潜力的轻量化材料之一,其推广应用对节能减排和能源转型战略具有重要意义。但镁合金具有密排六方晶体结构,塑性变形能力较差。如何改善镁合金的塑性变形能力是扩大镁合金应用的瓶颈问题之一。本文综述了10多年来,世界各国在改善镁合金塑性、提升镁合金塑性变形能力等方面所做的大量工作,及在镁合金塑性加工技术等方面取得的重要进展。发展了'固溶强化增塑'新型镁合金设计理论和'熔体变温自纯化'等关键制备技术,形成了一批高塑性变形镁合金材料和牌号,其中杂质Fe含量可降到10×10^(-6)以下,超高塑性镁合金延伸率可达到60%以上,超高强度(抗拉强度大于550 MPa)镁合金延伸率可以达到10%以上;开发了非对称挤压、非对称轧制、非对称改性、往复循环多道次镦挤开坯技术、扩收控制大比率锻造技术、挤锻复合成形技术等一批镁合金新型塑性加工技术。这些合金和技术使变形镁合金基面织构显著弱化,明显提高了变形镁合金板材、管型材和锻件的塑性成形能力和制品质量,产品成本大幅度降低,在板材、管型材和锻件制备加工中实现了成功应用。 | 潘复生 蒋斌 | 2021 | 金属学报2021，57，11： | 27 |
| 2 | Review on the effect of different processing techniques on the microstructure and mechanical behaviour of AZ31 Magnesium alloy显示文摘Magnesium(Mg)alloys despite being the ideal candidate for structural applications,owing to their high specific strength and low density,are not widely used due to lack of active slip systems at room temperature in their hexagonal close-packed crystal structure,eliciting poor ductility and formability.Amongst the various series of Mg alloys,the AZ and ZK series alloys have been standouts,as they inherit better room temperature strength and flow characteristics through their solute elements.Grain refinement,as well as eliminating casting defects through metal processing techniques are vital for the commercial viability of these alloys since they play a key role in controlling the mechanical behaviour.As such,this review highlights the effect of different Bulk-deformation and Severe Plastic Deformation techniques on the crystal orientation and the corresponding mechanical behaviours of the AZ31 alloy.However,every process parameter surrounding these techniques must be well thought of,as they require specially designed tools.With the advent of finite element analysis,these processes could be computationally realized for different parameters and optimized in an economically viable manner.Hence,this article also covers the developments made in finite element methods towards these techniques. | Rakshith M. Seenuvasaperumal P. | 2021 | Journal of Magnesium and Alloys2021，9，5： | 12 |
| 3 | 低合金化高性能变形镁合金研究现状及展望显示文摘变形镁合金通过调控微观组织、优化变形工艺,提高材料的力学性能,从而具有广泛的应用前景。低合金化镁合金在成形性、耐腐蚀性及轻量化等方面具有较大优势。低合金、高性能成为变形镁合金发展的重要趋势之一。本文重点概述了低合金化高强、高塑、超塑性变形镁合金在合金成分设计、强韧化机制及加工技术等方面的研究进展,并从提高生产效率、扩大应用范围的角度,展望了低合金化变形镁合金的发展趋势。 | 王慧远 夏楠 布如宇 王珵 查敏 杨治政 | 2021 | 金属学报2021，57，11： | 8 |
| 4 | Quasi-in-situ observing the rare earth texture evolution in an extruded Mg-Zn-Gd alloy with bimodal microstructure显示文摘The static recrystallization and associated texture evolution were investigated in an extruded Mg-Zn-Gd alloy with bimodal microstructure based on a quasi-in-situ electron back-scatter diffraction(EBSD)method.The typical rare earth(RE)texture formed during annealing,evolving from the bimodal microstructure with[1010]basal fiber texture that consisted of fine recrystallized(RXed)grains and coarse unrecrystallized(un RXed)grains elongated along the extrusion direction.In both RXed and un RXed regions,the RXed nucleation produced randomized orientations without preferred selection and the RXed grains with RE texture orientation had more intensive growth ability than those with basal fiber orientation,thereby leading to the preferred selection of RE texture orientation during grain growth.The relationships between stored strain energy,solute drag,grain growth and texture evolution are discussed in detail.This study provided direct evidence of the RE texture evolution in an extruded Mg-RE alloy,which assists in understanding the formation mechanisms for RE texture during extrusion and better developing wrought Mg alloys with improved formability. | M.G.Jiang C.Xu H.Yan T.Nakata Z.W.Chen C.S.Lao R.S.Chen S.Kamado E.H.Han | 2021 | Journal of Magnesium and Alloys2021，9，5： | 4 |
| 5 | Deformation mechanism of fine grained Mg-7Gd-5Y-l.2Nd-0.5Zr alloy under high temperature and high strain rates显示文摘Fine grained Mg-7Gd-5Y-1.2Nd-0.5Zr alloy was investigated by dynamic compression tests using a Split Hopkinson Pressure Bar under the strain rates in the range 1000-2000 s^(-1) and the temperature range 293-573 K along the normal direction.The microstructure was measured by optical microscopy,electron back-scattering diffraction,transmission electron microscopy and X-ray diffractometry.The results showed that Mg-7Gd-5Y-1.2Nd-0.5Zr alloy had the positive strain rate strengthening effect and thermal softening effect at high temperature.The solid solution of Gd and Y atoms in Mg-7Gd-5Y-1.2Nd-0.5Zr alloy reduced the asymmetry of α-Mg crystals and changed the critical shear stress of various deformation mechanisms.The main deformation mechanisms were prismatic slip and pyramidal(a)slip,{102}tension twinning,and dynamic recrystallization caused by local deformation such as particle-stimulated nucleation.c 2020 Published by Elsevier B.V.on behalf of Chongqing University. | Wanru Tang Zheng Liu Shimeng Liu Le Zhou Pingli Mao Hui Guo Xiaofang Sheng | 2020 | Journal of Magnesium and Alloys2020，8，4： | 2 |
| 6 | Microstructure and mechanical properties of repair welds of low-pressure sand-cast Mg?Y?RE?Zr alloy by tungsten inert gas welding显示文摘The sand castings of Mg-Y-RE-Zr series alloys are widely utilized in the large scales and complex shapes in the aerospace industry,as a result of which there are always some cast defects in the products. In this study, the feasibility of repair welding of sand-cast Mg-4 Y-3 RE-0.5 Zr alloy by tungsten inert gas(TIG) welding was scrutinized with different welding currents from 150 to 210 A. The results indicated that defect-free repaired joints with good appearance could be acquired at 170 and 190 A. Interestingly, the grain size of the fusion zone(FZ) was refined initially and then increased with the linear increment of welding current. Because at the higher heat inputs, although the cooling rate of the molten pool was reduced, substantial constitutional supercooling for the grain refinement was attained after the Zr particles were transformed into Zr solutes. The tensile strength of the repaired joint at 170 A was 195 MPa with the maximum joint efficiency of 87.8%, and the elongation reached to 124.4% of the sand-cast base material(BM). However, serious grain coarsening and continuous eutectic structures generated in heat-affected zone(HAZ) above 190 A resulted in the weakening of the joint due to the brittle intergranular fracture. | Xin Tong Guohua Wu Liang Zhang Yingxin Wang Wencai Liu Wenjiang Ding | 2022 | Journal of Magnesium and Alloys2022，10，1： | 2 |
| 7 | 轧制温度和后处理方式对AZ31镁合金显微组织和力学性能的影响显示文摘在不同的轧制温度下,对AZ31镁合金板进行轧制,然后取出轧板立即进行水冷、空冷和退火3种不同的后处理。探究轧制温度和后处理对镁合金显微组织和力学性能的影响。结果表明,轧制温度为250、300℃时,水冷和空冷处理后板材存在着大量的孪晶,350℃时由于轧制温度较高,孪晶的数量很少;水冷处理后的平均晶粒尺寸要小于空冷,空冷处理之后的孪晶数量略少于水冷,当轧制温度为350℃时,退火处理后,晶粒尺寸减小,晶粒趋于等轴状,晶格畸变程度低。在相同的轧制温度下,水冷处理的镁合金板材的屈服强度、抗拉强度和硬度较高;退火处理后可以显著提高板材的伸长率,但屈服强度、抗拉强度略有下降。轧制温度升高时,3种后处理方式之间屈服强度和抗拉强度的最大差值会减小。 | 宋先和 刘晓烨 毕仁贵 卢立伟 刘雁峰 黄熙鸿 | 2023 | 金属热处理2023，48，3： | 1 |
| 8 | Post deformation analysis of the ballistic impacted magnesium alloys,a short-review显示文摘From the mechanistic point of view,magnesium alloys are lightweight materials and are receiving increasing attention in the past several years in various fields.Prof.Liang Zhen from Harbin Institute of Technology,China and the United State military are showing keen interest in the development of magnesium alloys as ballistic resistant material.However,their use is still limited owing to low ductility,low formability,and average mechanical properties.The magnesium alloys components must withstand the shockwave under hypervelocity ballistic impact.The ballistic testing can produce gradient variations of the strain and stress-energy away from the crater,and useful for the development of these alloys in the military and aerospace industry.Therefore,the present review article shed light on the post deformation analysis of the Mg alloys subjected to the different projectiles under ballistic impact,and the underlying mechanisms were discussed.In the end,some important issues regarding the ballistic impact and further studies in this field were proposed. | Abdul Malik Yangwei Wang Cheng Huanwu Faisal Nazeer Muhammad Abubaker Khan | 2021 | Journal of Magnesium and Alloys2021，9，5： | 1 |
| 9 | 径锻AZ61镁合金退火后晶粒长大及组织演变规律显示文摘目的通过研究径锻AZ61镁合金棒材在后续退火处理时的晶粒长大和组织均匀性演变行为,构建等温条件下径锻AZ61镁合金晶粒长大模型,总结径锻镁合金退火后组织均匀性演变规律,为此棒材后续热处理工艺的制定提供理论借鉴和指导。方法基于系统的等温正交退火试验,量化统计各退火条件下样品组织的平均晶粒尺寸和晶粒尺寸分布,分析径锻AZ61镁合金棒材的晶粒长大行为和组织均匀性演变规律。结果退火后,径锻AZ61镁合金组织中晶粒趋于长大。在250~300℃温度区间内,晶粒长大速度较为缓慢。随着退火温度的升高,晶粒长大速率随之上升,尤其是退火温度升高到450℃以后,晶粒长大速率显著增大。当退火温度一定时,退火起始30 min内,晶粒快速长大。在之后的长时间退火过程中,晶粒长大速度逐渐放缓。同时,随着退火的进行,锻后样品中存在的超细晶条带状组织逐渐消失,样品组织均匀性显著提高。结论通过研究晶粒长大现象构建的等温条件下径锻AZ61镁合金晶粒长大模型与试验结果拟合良好。结合组织均匀性演变规律,径锻AZ61镁合金退火后的组织状态能够被很好地预测。 | 张凯 马立峰 邹景锋 | 2023 | 精密成形工程2023，15，4： | 0 |
| 10 | 自由端扭转对AZ31挤压棒不同温度下压缩行为的影响显示文摘研究自由端扭转对AZ31挤压棒不同温度下压缩行为的影响。预扭转会在基体中产生高密度位错和大量的{1012}孪晶,从而大大提升室温和100℃的压缩屈服强度。然而,随着温度的升高,预扭转产生的硬化效果逐渐减弱。当压缩温度达到300℃时,预扭转降低了压缩屈服强度。此外,扭转产生的初始位错和孪晶有助于细化亚结构,加快200℃压缩过程中的连续动态再结晶。因此,在200℃下,扭转试样比挤压试样表现出更快的流变软化行为。当在300℃时压缩,扭转引入的孪晶和位错在保温时间内基本被消除,不连续动态再结晶得到增强。结果表明,在300℃时,扭转试样和挤压试样的压缩曲线趋于一致。对相关机制进行了详细讨论。 | 吴凡 王猛 杜治文 石若兰 尚琦 刘婷婷 郭宁 郭胜锋 宋波 | 2022 | Transactions of Nonferrous Metals Society of China2022，32，11： | 0 |
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