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Microstructure Optimization of Mg-Alloys by the ECAP Process Including Numerical Simulation, SPD Treatments, Characterization, and Hydrogen Sorption Properties

机译:Mg-合金的微观结构优化通过ECAP过程,包括数值模拟,SPD处理,表征和氢气吸附性能

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Both numerical simulation and hardness measurements were used to determine the mechanical and microstructural behavior of AZ31 bulk samples when submitted to the Equal Channel Angular Pressing (ECAP) technique. Billets of this representative of Mg-rich alloys were submitted to different numbers of passes for various ECAP modes (anisotropic A, isotropic B-C). The strain distribution, the grain size refinement, and the micro-hardness were used as indicators to quantify the effectiveness of the different processing routes. Structural characterizations at different scales were achieved using Scanning Electron Microscopy (SEM), micro-analysis, metallography, Small Angle Neutron Scattering SANS, X-Ray Diffraction (XRD), and texture determination. The grain and crystallite size distribution and orientation as well as defect impacts were determined. Anelastic Spectroscopy (AS) on mechanically deformed samples have shown that the temperature of ECAP differentiate the fragile to ductile regime. MgH2 consolidated powders were checked for using AS to detect potential hydrogen motions and interaction with host metal atoms. After further optimization, the different mechanically-treated samples were submitted to hydrogenation/dehydrogenation (H/D) cycles, which shows that, for a few passes, the B-C mode is better than the A one, as supported by theoretical and experimental microstructure analyses. Accordingly, the hydrogen uptake and (H/D) reactions were correlated with the optimized microstructure peculiarities and interpreted in terms of Johnson-Avrami- Mehl-Kolmogorov (JAMK) and Jander models, successively.
机译:在提交到相等通道角压(ECAP)技术时,使用数值模拟和硬度测量来确定AZ31散装样品的机械和微观结构行为。将该代表的富含Mg的合金的坯料提交给不同数量的各种ECAP模式(各向异性A,各向同性B-C)。使用应变分布,晶粒尺寸细化和微硬度作为指标,以量化不同加工途径的有效性。使用扫描电子显微镜(SEM),微分析,金相,小角度中子散射SAN,X射线衍射(XRD)和纹理测定来实现不同尺度的结构特征。确定谷物和微晶尺寸分布和取向以及缺陷局部。在机械变形样品上的Anelastic光谱(AS)表明Ecap的温度将脆弱与延性制度分化。检查MGH2合并粉末,用于检测潜在的氢运动和与宿主金属原子的相互作用。在进一步优化之后,将不同的机械处理的样品提交至氢化/脱氢(H / d)循环,表明,对于几次通过,BC模式优于A一体,如理论和实验微观结构分析所支持的那样。因此,氢吸收和(h / d)反应与优化的微观结构特性相关,并通过连续的约翰逊-Avrami-Mehl-Kolmogorov(Jamk)和Jamk模型来解释。

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