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金属顶刊双语导读丨Scripta Mater. Vol.205, 1 Dec. 2021（上）

2021-12-03 来源：Goal Science

 

本期包含金属材料领域论文9篇，涵盖了钛合金、铝合金、增材制造、马氏体等，国内科研单位包括西北工业大学等（通讯作者单位）。

 

Vol. 205 目录

1. Heat-affected coarsening of β grain in titanium alloy during laser directed energy deposition

激光定向能量沉积钛合金中β晶粒的热影响粗化

 

2. A molecular dynamics study of path-dependent grain boundary properties in nanocrystals prepared using different methods

使用不同方法制备的纳米晶体中路径相关晶界特性的分子动力学研究

 

3. The mechanical response of additively manufactured IN625 thin-walled structures

增材制造IN625薄壁结构的机械响应

 

4. Predicting the energetics and kinetics of Cr atoms in Fe-Ni-Cr alloys via physics-based machine learning

通过基于物理的机器学习预测Fe-Ni-Cr合金中Cr原子的能量学和动力学

 

5. Observation of Portevin-le Chatelier effect in aluminum alloy 7075-w under a heterogeneous stress field

7075-w铝合金非均质应力场下Portevin-le Chatelier效应的观察

 

6. Cyclic response of additive manufactured 316L stainless steel: The role of cell structures

增材制造316L不锈钢的循环响应：胞状结构的作用

 

7. Impact of Ni alloying on Fe-C martensite ageing: an atomistic investigation

Ni合金化对Fe-C马氏体时效的影响：一项原子尺度研究

 

8. Aperiodic structures of rod-shaped precipitates in a Mg-Zn-Al alloy

Mg-Zn-Al合金中棒状析出物的非周期性结构

 

9. Giant magnetic-field-induced bending effect in Ni-Mn-Ga-Co-Cu melt-spun ribbons

Ni-Mn-Ga-Co-Cu熔纺薄带中的巨大磁场诱导弯曲效应

 

 

SCRIPTA

Vol. 205, 1 Dec. 2021, 114180

1. Heat-affected coarsening of β grain in titanium alloy during laser directed energy deposition

激光定向能量沉积钛合金中β晶粒的热影响粗化

 

Aitang Xue✉, Xin Lin, Lilin Wang, Xufei Lu, Hanlin Ding, Weidong Huang

Aitang Xue: atxue@mail.nwpu.edu.cn (西北工业大学)

https://doi.org/10.1016/j.scriptamat.2021.114180

 

摘要

钛合金中β晶粒在增材制造 (AM) 过程中会受热影响而粗化，这极大影响了实现像锻造态的细β晶粒，但过去的研究忽视了这点。在项工作，我们报告了Ti6Al4V等轴β晶粒的显着粗化发生在激光定向能量沉积过程中的瞬时高温（β转变温度以上）热循环下。 特别是初始β晶粒越小，能量密度越大，预热温度越高，粗化越显著。同时，提出了一种用于预测增材制造钛合金中粗化的β晶粒的尺寸的修正模型。 这些发现为增材制造条件下的β晶粒提供了更全面的认识，并对具有细等轴β晶粒的增材制造钛合金的成分设计提供了重要指导。

向上滑动阅览英文摘要

The heat-affected coarsening of β-grains in titanium alloy produced by additive manufacturing (AM), which would be important for the achievement of fine β-grain like forging, was completely neglected in the past. Here, we reported that the significant coarsening of equiaxed β-grain of Ti6Al4V happened under the instantaneous high-temperature (above β-transus) thermal cycling during laser directed energy deposition process. Especially, the coarsening becomes more striking in the cases of smaller initial β-grain, larger energy density and higher preheating-temperature. Meanwhile, a modified model used to predict the size of the coarsened β-grain of AM titanium alloy was proposed. These findings provide a more comprehensive understanding of the β-grains of AM titanium alloy and a significant guidance for the composition design of AM titanium alloy with fine equiaxed β-grains.

 

 

SCRIPTA

Vol. 205, 1 Dec. 2021, 114183

2. A molecular dynamics study of path-dependent grain boundary properties in nanocrystals prepared using different methods

使用不同方法制备的纳米晶体中路径相关晶界特性的分子动力学研究

 

Hao Sun✉, Laurent Karim Beland✉

Hao Sun: hs126@queensu.ca

Laurent Karim Beland: laurent.beland@queensu.ca

https://doi.org/10.1016/j.scriptamat.2021.114183

 

摘要

晶界在热力学上是不稳定的，因此，它们的特性应该是与路径相关的，使用不同方法制备的纳米晶中的晶界可能表现出不同的特性。使用分子动力学模拟，我们分别研究了通过淬火、预诱导成核位点凝固和Voronoi镶嵌形成的不同纳米体的晶界，并发现一些与路径有关的特性：淬火模型的每个原子边界能量较低，每个原子的边界过剩自由体积较小，晶粒生长速度比Voronoi模型慢。我们推测这些差异归因于淬火模型中大量的退火孪晶。此外，一些属性与路径无关，例如杨氏模量、泊松比以及晶界能量与过剩自由体积之间的比率。本研究的结果进一步加深了对纳米晶结构-性能关系的理解，并为未来基于模拟的纳米晶材料研究提供了指导。

向上滑动阅览英文摘要

Grain boundaries are thermodynamically unstable. Hence, their properties should be path-dependent: grain boundaries in nanocrystals prepared using different methods might exhibit different properties. Using molecular dynamics simulations, we investigated grain boundaries of different nanocrystals formed by quenching, solidification with pre-induced nucleation sites, and Voronoi tessellation, respectively. Some properties were found to be path-depend: the quenched model has lower boundary energy per atom, smaller boundary excess free volume per atom, and slower grain growth than the Voronoi model. We surmise that these differences are attributed to the abundant annealing twins in the quenched model. On the other hand, other properties are path-independent, such as Young's modulus, Poisson's ratio, and the ratio between grain boundary energy and excess free volume. The results of this study further the understanding of the structural-property relationship of nanocrystals and provide guidance to future simulation-based studies of nanocrystalline materials.

 

 

SCRIPTA

Vol. 205, 1 Dec. 2021, 114188

3. The mechanical response of additively manufactured IN625 thin-walled structures

增材制造IN625薄壁结构的机械响应

 

Arunima Banerjee, Sara Messina, Matthew R. Begley, Edwin J. Schwalbach, Michael A. Groeber, William D. Musinski, Paul A. Shade, Marie E. Cox, Jonathan D. Miller, Kevin J. Hemker✉

Kevin J. Hemker: hemker@jhu.edu

https://doi.org/10.1016/j.scriptamat.2021.114188

 

摘要

与传统制造相比，增材制造提供了增强的设计和拓扑复杂性，非常适合制造复杂的结构。这项工作中，我们提出了一种新的毫米级测试方法来评估激光粉床打印的 Inconel 625薄壁结构的特定位置的机械响应。通过高分辨率数字图像与环境温度毫级测试相结合，以了解T形试样中塑性变形的进展。塑性应变集中在水平和垂直韧带的交叉处，这意味着它们在设计过程中的重要性。EBSD图像阐明了几何结构在平面纹理发展中的作用。各向同性有限元模型无法完全预测打印样本的力学性能响应，但由纹理测量驱动的各向异性模型产生了更好的一致性。这项工作说明了局部加工和微观结构对增材制造部件的机械响应的重要性。

向上滑动阅览英文摘要

Additive manufacturing offers enhanced design and topological complexity over traditional manufacturing and is well suited to fabricate complex structures. Here, we present a new milli-scale test method to assess the location-specific mechanical response of laser powder-bed printed Inconel 625 thin-walled structures. High-resolution digital image correlation was coupled with ambient temperature milli-scale tests to understand the progression of plastic deformation in T-shaped specimens. Plastic strains were concentrated around the intersection of the horizontal and vertical ligaments, emphasizing their importance in the design process. EBSD scans elucidated the role of geometry in the development of in-plane texture. Isotropic finite element models were unable to fully predict the response of printed specimens, but anisotropic models, motivated by the texture measurements, resulted in much better agreement. This work illustrates the importance of local processing and microstructure on the mechanical response of additively manufactured components.

 

 

SCRIPTA

Vol. 205, 1 Dec. 2021, 114177

4. Predicting the energetics and kinetics of Cr atoms in Fe-Ni-Cr alloys via physics-based machine learning

通过基于物理的机器学习预测Fe-Ni-Cr合金中Cr原子的能量学和动力学

 

Yuchu Wang, Bita Ghaffari, Christopher Taylor, Simon Lekakh, Mei Li, Yue Fan✉

Yue Fan: fanyue@umich.edu

https://doi.org/10.1016/j.scriptamat.2021.114177

 

摘要

奥氏体合金中Cr原子的能量和激活势垒的分布在多种化学（例如固溶体与偏析状态）和显微结构（例如块体与晶界）环境中的多类型样品上进行了研究。借助基于物理的机器学习算法，发现可以根据局部电负性（χ）和局部原子堆积的自由体积 (Vv) 可靠地预测Cr原子的热力学和动力学行为，并建立了χ-Vv参数空间中相应的预测图。这些图与现有实验结果一致，并通过具有不同原子间力场的并行建模进行了验证。同时讨论了本研究在指导具有所需性能的奥氏体合金设计方面的潜力。

向上滑动阅览英文摘要

The energy and activation barrier distributions of Cr atoms in austenitic alloys are investigated over a multiplicity of modeling samples across a wide range of chemical (e.g. solid solutions vs. segregated states) and microstructural (e.g. bulk vs. grain boundaries) environments. Assisted with a physics-based machine learning algorithm, it is found that the thermodynamic and kinetic behaviors of Cr atoms can be reliably predicted according to the local electronegativity (χ) and free volume of local atomic packing (Vv). The corresponding predictive maps in the χ-Vv parameter space are established, which are in line with existing experiments and validated by a parallel modeling with a different interatomic force field. The implications of the present study regarding its potential to guide the design of austenitic alloys with desired properties are also discussed.

 

 

SCRIPTA

Vol. 205, 1 Dec. 2021, 114178

5. Observation of Portevin-le Chatelier effect in aluminum alloy 7075-w under a heterogeneous stress field

7075-w铝合金非均质应力场下Portevin-le Chatelier效应的观察

 

Yumi Choi, Jinjin Ha✉, Myoung-Gyu Lee, Yannis P. Korkolis

Jinjin Ha: jinjin.ha@unh.edu

https://doi.org/10.1016/j.scriptamat.2021.114178

 

摘要

针对固溶热处理的AA7075铝板研究了Portevin-Le Chatelier（PLC）带在使用平头冲头扩孔过程中的动力学。该实验在准静态应变率和室温下进行，整个变形过程中孔周边的全应变场由立体数字图像相关系统测量。PLC带活动的观察是基于厚度应变率场。每个单独的PLC带似乎沿径向排列，跨越不同的应力状态，并在从成核到耗散的寿命期间沿圆周方向传播。此外，在实验过程中记录了所有PLC带的成核位置，这表明PLC带的成核频率受塑性各向异性的影响，并且与厚度应变水平成比例增加。

向上滑动阅览英文摘要

The kinetics of Portevin-Le Chatelier (PLC) bands in the hole-expansion of a circular hole using a flat-headed punch are investigated for a solid-solution heat-treated AA7075 aluminum sheet. This experiment is performed under quasi-static strain-rate and at room temperature. The full strain field in the hole periphery during the entire deformation is measured by a stereo-type digital image correlation system. The observations of PLC band activity are based on the thickness strain-rate field. Each individual PLC band appears aligning along the radial direction, spanning diverse stress states, and propagates along the circumferential direction during the life time from nucleation to dissipation. Furthermore, the nucleation sites of all the PLC bands are recorded during the experiment, which shows that the nucleation frequency of a PLC band is influenced by the plastic anisotropy, and that it increases proportionally to the level of thickness strain.

 

 

SCRIPTA

Vol. 205, 1 Dec. 2021, 114190

6. Cyclic response of additive manufactured 316L stainless steel: The role of cell structures

增材制造316L不锈钢的循环响应：胞状结构的作用

 

Luqing Cui✉, Fuqing Jiang, Dunyong Deng, Tongzheng Xin, Xiaoyu Sun, Reza Taherzadeh Mousavian, Ru Lin Peng, Zhiqing Yang✉, Johan Moverare✉

Luqing Cui: luqcu85@liu.se

Zhiqing Yang: yangzq@imr.ac.cn（中国科学院金属研究所）

Johan Moverare: johan.moverare@liu.se

https://doi.org/10.1016/j.scriptamat.2021.114190

 

摘要

我们报告了胞状结构对增材制造（AM）316L不锈钢（316LSS）疲劳行为的影响。与无胞状结构样品相比，全胞状结构样品的疲劳过程仅包括稳定和过载阶段，没有初始软化阶段。此外，全胞状结构样品具有更高的强度、更低的循环软化率和更长的寿命。显微分析显示了晶粒取向、尺寸和形状没有差异。然而，全胞状结构样品显示出平面位错结构，而无胞状结构样品显示出波状位错结构。胞状结构的存在促进了平面滑移的激活，延迟了局部应变，最终增强了AM 316LSS的疲劳性能。

向上滑动阅览英文摘要

We report the effect of cell structures on the fatigue behavior of additively manufactured (AM) 316L stainless steel (316LSS). Compared with the cell-free samples, the fatigue process of fully cellular samples only consists of steady and overload stages, without an initial softening stage. Moreover, the fully cellular sample possesses higher strength, lower cyclic softening rate and longer lifetime. Microscopic analyses show no difference in grain orientations, dimensions, and shapes. However, the fully cellular samples show planar dislocation structures, whereas the cell-free samples display wavy dislocation structures. The existence of cell structures promotes the activation of planar slip, delays strain localization, and ultimately enhances the fatigue performance of AM 316LSS.

 

 

SCRIPTA

Vol. 205, 1 Dec. 2021, 114182

7. Impact of Ni alloying on Fe-C martensite ageing: an atomistic investigation

Ni合金化对Fe-C马氏体时效的影响：一项原子尺度研究

 

Paul Eymeoud✉, Liangzhao Huang, Philippe Maugis

Paul Eymeoud: paul.eymeoud@univ-amu.fr

https://doi.org/10.1016/j.scriptamat.2021.114182

 

摘要

该工作在原子尺度上对Ni合金化对Fe-C马氏体时效的影响进行计算。使用 Climbing Image Nudged Elastic Band 技术，我们展示了α-铁中Ni-C成对相互作用的排斥性，并证明了Ni合金化降低了与α-铁中的间隙碳相关的迁移能和力偶极张量分量。成对相互作用、迁移能量和偶极子分量的计算值用于实施动力学蒙特卡罗方法。 我们发现镍合金化：（i）对马氏体热力学稳定性的影响可以忽略不计，（ii）通过增加碳扩散率来加速时效动力学。

向上滑动阅览英文摘要

We propose a computational investigation of Ni-alloying impact on Fe-C martensite ageing, at the atomic scale. Using the Climbing Image Nudged Elastic Band technique, we showed the repulsive nature of Ni-C pairwise interactions in α-iron, and demonstrated that Ni alloying lowers the migration energies and force dipole tensor components associated to an interstitial carbon in α-iron. Computed values of pairwise interactions, migration energies and dipole components were used to implement a Kinetic Monte-Carlo approach. We found that Ni alloying: (i) has negligible impact on martensite thermodynamical stability, (ii) accelerates ageing kinetics, by increasing carbon diffusivity.

 

 

SCRIPTA

Vol. 205, 1 Dec. 2021, 114189

8. Aperiodic structures of rod-shaped precipitates in a Mg-Zn-Al alloy

Mg-Zn-Al合金中棒状析出物的非周期性结构

 

Yunhe Zheng, Laure Bourgeois, Jian-Feng Nie✉

Jian-Feng Nie: jianfeng.nie@monash.edu

https://doi.org/10.1016/j.scriptamat.2021.114189

 

摘要

长轴平行于[0001]α的棒状析出物通常在Mg-Zn-Al合金中形成，提供强化效果。这些析出物是亚稳态的，通常被认为是MgZn2和/或Mg4Zn7相。在本文中，使用高角度环形暗场扫描透射电子显微镜在原子尺度上检查了时效ZA84合金中析出棒状物的横截面结构。发现这些沉淀物既不是纯MgZn2也不是纯Mg4Zn7。棒状析出物的结构在垂直于棒长轴的二维投影平面上不具有长程平移对称性和长程5重旋转对称性。 然而，这些结构可以通过不同形状的平铺来描述，最常见的是四种这样的形状。这项工作中揭示的结构细节可能有助于使Mg-Zn-Al和Mg-Zn合金中的许多复杂析出物结构合理化。

向上滑动阅览英文摘要

Rod-shaped precipitates with their long axis parallel to [0001]α commonly form in Mg-Zn-Al alloys, providing strengthening effects. These precipitates are metastable and are generally accepted to be the MgZn2 and/or Mg4Zn7 phases. In this paper, the cross-sectional structure of precipitate rods in an aged ZA84 alloy is examined at the atomic scale using high-angle annular dark-field scanning transmission electron microscopy. It is found that these precipitates are neither pure MgZn2 nor Mg4Zn7. The structures of the rod-shaped precipitates do not have long-range translational symmetry nor long-range 5-fold rotational symmetry in the two-dimensional projection plane perpendicular to the rod long axis. However, these structures can be described by the tiling of different shapes, with four such shapes being most frequently observed. The structural details revealed in this work may help rationalize the many complex precipitate structures in Mg-Zn-Al and Mg-Zn alloys.

 

 

SCRIPTA

Vol. 205, 1 Dec. 2021, 114203

9. Giant magnetic-field-induced bending effect in Ni-Mn-Ga-Co-Cu melt-spun ribbons

Ni-Mn-Ga-Co-Cu熔纺薄带中的巨大磁场诱导弯曲效应

 

M.J. Szczerba✉

M.J. Szczerba: m.szczerba@imim.pl

https://doi.org/10.1016/j.scriptamat.2021.114203

 

摘要

该文章首次报告了对通过熔体纺丝技术生产的Ni-Mn-Ga-Co-Cu合金的巨磁场诱导弯曲效应。在使用在1173 K下退火60分钟以释放内应力的带材进行弯曲实验期间观察到了这种效果。在0.06T的极低磁场下观察到弯曲效应的开始。小于0.2T的外部磁场产生的整体变形由塑性和弹性的贡献组成。第一次是在初始弯曲周期中观察到的，而后者占主导地位。

向上滑动阅览英文摘要

The paper reports on the first observations of giant magnetic-field-induced bending effect in Ni-Mn-Ga-Co-Cu alloys produced by the melt-spinning technique. The effect was observed during bending experiments using ribbons that were initially annealed at 1173 K for 60 min in order to release the internal stress. Initiation of the bending effect was observed at very low magnetic field of 0.06T. The overall deformation, generated by external magnetic field of less than 0.2T, was composed of plastic as well as elastic contributions. The first was observed during the initial bending cycle, whereas, the latter dominated further on.