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| 1 | Mg_(17)Al_(12)热挤压细化对SiCp/AZ91复合材料组织及性能的影响显示文摘采用热挤压法破碎铸态SiCp/AZ91镁基复合材料中的Mg_(17)Al_(12),对Mg_(17)Al_(12)破碎及弥散分布行为进行研究,并对复合材料的力学性能进行表征。结果表明:铸态SiCp/AZ91复合材料经热挤压后,不规则片状及线形Mg_(17)Al_(12)在基体合金和SiC颗粒的剪切应力场作用下,破碎成大量亚微米级的颗粒,并随基体合金的塑性变形发生重新分布,弥散分布在动态再结晶晶粒的晶界附近,通过钉扎晶界作用能够细化复合材料晶粒尺寸到2.3μm。此外,破碎化的Mg_(17)Al_(12)还起到弥散强化基体的作用,与晶粒细化协同作用,显著提高了复合材料的强度。 | 尚拴军 邓鹏辉 蔡刚毅 田野 | 2017 | 材料热处理学报2017，38，11： | 5 |
| 2 | 微量Ca元素对AZ31镁合金热变形行为的影响显示文摘采用Gleeble-3500热模拟试验机对AZ31镁合金及添加0.2%(质量分数)Ca的AZ31(AZ31-0.2Ca)镁合金在变形温度为300~500℃、应变速率为0.001~1 s^-1范围内进行等温热压缩实验。基于流变应力曲线,结合双曲正弦函数建立的本构方程与动态材料模型(DMM)构建的加工图,系统地分析了Ca元素对AZ31镁合金热变形行为的影响。结果表明,与AZ31镁合金相比,AZ31-0.2Ca镁合金在较低温度和较高应变速率下的流变应力水平得到提高,应力指数n值有所减小,但热变形激活能Q值变化不大。此外,添加Ca元素能够扩大AZ31镁合金的可加工区域。AZ31-0.2Ca镁合金的最优加工区域为:温度400~490℃、应变速率0.001~0.01 s^-1和温度420~480℃、应变速率0.2~1 s^-1。 | 谢誉璐 黄光胜 刘帅帅 张军磊 潘复生 | 2020 | 材料导报2020，34，12： | 4 |
| 3 | Modeling of microstructure evolution of AZ80 magnesium alloy during hot working process using a unified internal state variable method显示文摘In this paper, a unified internal state variable(ISV) model for predicting microstructure evolution during hot working process of AZ80 magnesium alloy was developed. A novel aspect of the proposed model is that the interactive effects of material hardening, recovery and dynamic recrystallization(DRX) on the characteristic deformation behavior were considered by incorporating the evolution laws of viscoplastic flow, dislocation activities, DRX nucleation and boundary migration in a coupled manner. The model parameters were calibrated based on the experimental data analysis and genetic algorithm(GA) based objective optimization. The predicted flow stress, DRX fraction and average grain size match well with experimental results. The proposed model was embedded in the finite element(FE) software DEFORM-3 D via user defined subroutine to simulate the hot compression and equal channel angular extrusion(ECAE) processes. The heterogeneous microstructure distributions at different deformation zones and the dislocation density evolution with competitive deformation mechanisms were captured.This study can provide a theoretical solution for the hot working problems of magnesium alloy. | Zexing Su Chaoyang Sun Mingjia Wang Lingyun Qian Xintong Li | 2022 | Journal of Magnesium and Alloys2022，10，1： | 3 |
| 4 | 变形镁合金微合金化研究进展:理论与设计显示文摘变形镁合金微合金化是发展低成本、高性能镁合金的重要方向。近二十年来,变形镁合金在理论研究及微合金化设计领域取得了重要研究进展。本文中作者重点从理论计算及合金设计两方面总结变形镁合金最新研究进展,为建立镁合金成分-性能关系奠定基础。首先,概述第一性原理计算、分子动力学、元胞自动机和晶体塑性有限元等不同尺度下镁合金性能的研究进展,继而分析Mg-Al、Mg-Zn、Mg-RE、Mg-Sn和Mg-Ca等重要变形镁合金体系中合金元素的作用,最后,展望微合金化变形镁合金的发展方向,为新型变形镁合金的高效设计提供指导。 | 蒋斌 董志华 张昂 宋江凤 潘复生 | 2022 | Transactions of Nonferrous Metals Society of China2022，32，6： | 3 |
| 5 | AZ31镁合金无缝管挤压动态再结晶数值模拟研究显示文摘通过热压缩实验得出温度在300~450℃,应变率为0.01~1 s-1时的应力-应变曲线,建立了AZ31镁合金的动态再结晶模型。该模型用于AZ31镁合金无缝管挤压过程中动态再结晶过程的数值模拟,并通过金相观察得以实验验证。结果表明,在挤压速度确定的情况下,挤压温度对动态再结晶分数的影响最为明显。随着挤压温度的升高,动态再结晶体积分数明显增大。预测的动态再结晶体积分数与实验结果吻合。 | 庄海华 杨柱 刘运腾 周吉学 马百常 王金伟 | 2017 | 山东科学2017，30，5： | 2 |
| 6 | Development of processing map for InX-750 superalloy using hyperbolic sinus equation and ANN model显示文摘The aim of this study is to develop processing maps based on two models and compare them with conventional processing maps.The hyperbolic sinus constitutive equation and artificial neural network(ANN)approaches were used in this investigation to predict flow stress and to develop processing maps in various conditions.The hot compression tests of InX-750 superalloy were carried out above the gamma prime phase temperature and within the temperature range of 1000-1150℃and strain rate of 0.001-1.000 s^(-1).The processing maps were conducted based upon dynamic material model(DMM)for data by experimental,constitutive equation and ANN approaches.The processing maps drawn by either of the prediction methods show that the method developed by ANN data does not significantly differ from the experimental processing map.The ANN approach is thus a suitable way to predict the flow stress as well as hot working processing map of engineering metals and materials. | Saeed Aliakbari Sani Ali Khorram Abed Jaffari Golamreza Ebrahimi | 2021 | Rare Metals2021，40，12： | 0 |
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