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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 | Texture evolution induced by twinning and dynamic recrystallization in dilute Mg-1Sn-1Zn-1Al alloy during hot compression显示文摘Texture evolution of an extruded dilute Mg-1Sn-1Zn-1Al alloy was thoroughly investigated based on the twinning and dynamic recrystallization(DRX)behavior via hot compression at a strain rate of 10 s^(-1)and temperature of 225℃.It was found that the types and intensities of the texture are strongly dependent on the fraction of twins and DRX modes as well as regions where sub-grain boundaries(sub-GBs)are intensively accumulated.At the initial stage of deformation,the formation of compression direction(CD)-tilted basal texture was mainly determined by the occurrence of{101^(-)2}extension twins.As the strain increases,the variation in the texture intensity was greatly dominated by the DRX modes but the type of main texture remained unchanged.These findings are of great importance for texture modification of wrought Mg-Sn-based alloys during post-deformation. | Meijuan Hao Weili Cheng Lifei Wang Ehsan Mostaed Liping Bian Hongxia Wang Xiaofeng Niu | 2020 | Journal of Magnesium and Alloys2020，8，3： | 6 |
| 3 | Mathematical analysis and its experimental comparisons for the accumulative roll bonding(ARB)process with different superimposed layers显示文摘Based on the traditional two-layer accumulative roll bonding(TARB),the geometrical variations and mathematical relationship during the four-layer accumulative roll bonding(FARB)were derived and summarized.Furthermore,the multi-layer accumulative roll bonding(MARB)technology was proposed and the geometrical variations and mathematical relationship of MARB were simultaneously derived and summarized.Experimentally,Mg-14Li-3Al-2Gd(LAGd1432)sheets were fabricated by TARB and FARB,respectively.Compared with the TARB,the FARB has a higher accumulative efficiency in terms of accumulative layers,total number of interfaces,interface spacing,total deformation and equivalent strain.Therefore,the FARB-processed sheets in lower cycles have the similar microstructure and mechanical properties of the TARB-processed sheets in higher cycles.In addition,FARB process can further break through the deformation limit of TARB process in a single cycle through adopting two-step rolling in one cycle with 50%deformation in one pass and 75%accumulative deformation in one cycle,which can effectively solve the problem of poor interface bonding of the latest interface brought by the last cycle,and thus significantly improve the phenomenon of unstable performance of the ARB-processed sheets. | Haipeng Zheng Ruizhi Wu Legan Hou Jinghuai Zhang Milin Zhang | 2021 | Journal of Magnesium and Alloys2021，9，5： | 4 |
| 4 | High-cycle fatigue behavior of Mg-8Li-3Al-2Zn-0.5Y alloy under different states显示文摘In this study,the tensile and high-cycle fatigue properties of as-cast,solid solution treated and as-extruded Mg-8Li-3Al-2Zn-0.5Y alloy are investigated.The results show that the yield strength and ultimate tensile strength of as-cast alloy is 198.1 MPa and 222.5 MPa,which are improved to 274.7 MPa and 321.7 MPa,282.4 MPa and 319.3 MPa after solid solution and extrusion treatment,respectively.The high-cycle fatigue strength(at 10^(7)cycles,R=-1)of as-cast studied alloy is 65 MPa,which is improved to 90 MPa and 105 MPa after solid solution and extrusion treatment,respectively.The improvement of fatigue property of the solid solution treated alloy is mainly due to the lattice distortion caused by solid solution hindering the crack propagation.However,the improvement of fatigue property of the as-extruded alloy is mainly due to that the refined grains,stacked dislocations and dispersed secondary particles impede the crack propagation. | Xiang Peng Xinli Liang Wencai Liu Guohua Wu Hao Ji Xin Tong Liang Zhang Wenjiang Ding | 2021 | Journal of Magnesium and Alloys2021，9，5： | 1 |
| 5 | LZ92镁锂合金激光焊接接头的显微组织与力学性能显示文摘采用CO_(2)激光焊接厚度为2mm的LZ92镁锂合金板,研究了焊接接头的显微组织、物相组成、显微硬度与拉伸性能。结果表明:LZ92镁锂合金焊接接头成形良好,焊缝中无明显气孔、裂纹等缺陷;母材与焊缝的物相组成相同,由α相、β相和中间相Mg_(7)Zn_(3)组成;母材由等轴状β相和枝晶状与颗粒状α相组成,热影响区由粗大的β相和少量细小颗粒状α相组成,焊缝中大量细针状和细小颗粒状α相均匀分布在β相中,β相晶界消失;焊缝的硬度最高,母材的次之,热影响区的最低;焊接接头的抗拉强度为158MPa,为母材的868.%,断后伸长率为27%;焊接接头的拉伸断口位于影响区与焊缝间的熔合线处,断口由韧窝和解理面组成,断裂形式为混合型断裂。 | 姜炳春 付琴 胡少华 唐联耀 刘方方 | 2021 | 机械工程材料2021，45，1： | 1 |
| 6 | LA103W镁锂合金TIG焊接接头组织与性能研究显示文摘采用钨极氩弧焊对5mm厚的LA103W镁锂合金板材进行焊接,研究LA103W镁锂合金的焊接质量、显微组织与力学性能。结果表明,焊接接头表面成型良好,焊缝中无超标气孔、裂纹等缺陷;接头的组织由α-Mg相和β-Li相组成,母材区和热影响区的β-Li相晶粒为等轴状,焊缝区和熔合区中含大量颗粒状和细针状的α-Mg相,熔合区中的α-Mg相均匀分布在β-Li相中,熔合良好,不易发生断裂。焊接接头的抗拉强度和延伸率均略低于母材,分别为母材的92.1%和90%。焊接接头的断裂方式为韧性-解理混合断裂,断裂在母材区。 | 夏聪聪 马立彩 鲁传洋 王锋 唐佳奇 | 2023 | 航天制造技术2023，，5： | 0 |
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