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金属顶刊双语导读丨Scripta Mater. Vol.202, 1 Sep. 2021（上）

2021-07-04 来源：GS_Metals

 

本期包含金属材料领域论文8篇，涵盖了高熵合金、增材制造、高温合金等，国内科研单位包括北京科技大学等（通讯作者单位）。

 

Vol. 202 目录

1. Design of a new cobalt base nano-lamellar eutectic high entropy alloy

一种新型钴基纳米层状共晶高熵合金的设计

 

2. Hierarchical structure in Al-Cu alloys to promote strength/ductility synergy

Al-Cu合金中的层次结构促进强度/塑性的协同作用

 

3. Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature

变形孪晶在CrCoNi中熵合金室温疲劳中的作用

 

4. High strength NiMnFeCrAlCu multi-principal-element alloys with marine application perspective

高强度NiMnFeCrAlCu多主元素合金在海洋中的应用前景

 

5. Vacancy surface migration mechanisms in dilute nickel-chromium alloys

稀Ni-Cr合金中的空位表面迁移机制

 

6. Effect of alloying elements on the coarsening rate of γʹ precipitates in multi-component CoNi-based superalloys with high Cr content

合金元素对高Cr多组分CoNi基高温合金γʹ析出相粗化速率的影响

 

7. Dual plateau stress of C15-type topologically close-packed lattice structures additive-manufactured by laser powder bed fusion

通过激光粉末床熔合技术增材制造的C15型拓扑密排晶格结构的双平台应力

 

8. Simultaneous deformation twinning and martensitic transformation in CoCrFeMnNi high entropy alloy at high temperatures

CoCrFeMnNi高熵合金在高温下同时产生变形孪晶和马氏体相变

 

 

SCRIPTA

Vol. 202, 1 Sep. 2021, 113993

1. Design of a new cobalt base nano-lamellar eutectic high entropy alloy

一种新型钴基纳米层状共晶高熵合金的设计

 

R. J. Vikram, Kushagra Gupta, Satyam Suwas✉

Satyam Suwas: satyamsuwas@iisc.ac.in 

https://doi.org/10.1016/j.scriptamat.2021.113993

 

摘要

受钴基高温合金优异性能的启发，以价电子浓度(VEC)为基础开发了钴基高温高熵合金(HEA)。新开发的钴基高熵合金具有纳米层状共晶形貌的两相组织。通过相图计算(CALPHAD)验证了组成相为面心立方(FCC)和有序立方(B2)结构。新开发的HEA在室温下表现出显著的应变硬化行为，并在500-800℃的温度范围内表现出热稳定性。

向上滑动阅览英文摘要

Inspired by the outstanding properties of cobalt-base superalloys, an effort has been made to develop cobalt-base high entropy alloy for high temperature applications based on valance electron concentration (VEC). The newly developed cobalt-base high entropy alloy exhibited a two-phase microstructure with nano lamellar eutectic morphology. The constituent phases were identified as face centered cubic (FCC) and ordered cubic (B2) structure, which were validated through CAlculation of PHAse Diagram (CALPHAD). The newly developed HEA exhibited remarkable strain hardening behavior at room temperature as well as thermal stability in the temperature range 500-800 °C.

 

 

SCRIPTA

Vol. 202, 1 Sep. 2021, 113996

2. Hierarchical structure in Al-Cu alloys to promote strength/ductility synergy

Al-Cu合金中的层次结构促进强度/塑性的协同作用

 

S. H. Wu, H. Xue, C. Yang, J. Kuang, P. Zhang, J.Y. Zhang, Y.J. Li, Hans J. Roven✉, G. Liu✉, J. Sun✉

Hans J. Roven: hans.j.roven@ntnu.no 

G. Liu: lgsammer@mail.xjtu.edu.cn  西安交通大学

J.Sun: junsun@mail.xjtu.edu.cn  西安交通大学

https://doi.org/10.1016/j.scriptamat.2021.113996

 

摘要

实验结果表明，与室温下的等通道转角挤压(ECAP)相比，低温下的ECAP能促进Al-2.5wt.%Cu的强度-塑性协同作用。两者的同时改善与多峰晶粒的组织层次、低角度晶界和晶间/晶内的析出相有关，这可以通过时效处理配合低温ECAP来调节。人工时效可以保持多峰晶粒尺寸分布，引入大量低角度晶界，产生晶内析出相，从而提高合金的强度/塑性。0.3 wt.% Sc的添加可有效优化合金的析出，进一步提高合金的强度/塑性组合。低温ECAP对强度和塑性提高的潜在机制是合理的。

向上滑动阅览英文摘要

 

Experimental evidence demonstrated that equal channel angular pressing (ECAP) at cryogenic temperature, in comparison with ECAP at room temperature, led to promoted strength-ductility synergy in an Al-2.5wt.%Cu alloy. The simultaneous improvement is related to microstructural hierarchy of multimodal grains, low angle grain boundaries, and inter/intragranular precipitates, which was tuned by aging treatment in match with the low-temperature ECAP. The artificial aging could maintain multimodal grain size distribution, introduce a large number of low angle grain boundaries and produce intragranular precipitates to improve strength/ductility. A minor 0.3wt.% Sc addition was effective in optimizing the precipitations and further boosting the strength/ductility combination. The underlying mechanisms for higher strength and greater ductility were rationalized in terms of the low-temperature ECAP.

 

 

SCRIPTA

Vol. 202, 1 Sep. 2021, 113985

3. Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature

变形孪晶在CrCoNi中熵合金室温疲劳中的作用

 

Milan Heczko✉, Veronika Mazánová, Connor E. Slone, Mulaine Shih, Easo P. George, Maryam Ghazisaeidi, Jaroslav Polák, Michael J. Mills

Milan Heczko: heczko.2@osu.edu 

https://doi.org/10.1016/j.scriptamat.2021.113985

 

摘要

对表面电解抛光CrCoNi合金的圆柱形试样进行了恒总应变幅低周疲劳试验。合金呈现出先循环硬化后循环软化直至失效的过程。在循环应力峰值硬化阶段结束时，由挤压物和侵入物组成的持久滑移标记(PSMs)建立了起来，这与薄的变形孪晶有关。本文设计了一个复杂的实验流程，从被测材料的表面和块体中提取信息。采用SEM、EBSD、ECCI、FIB和HR-STEM技术相结合，研究了循环加载初期变形孪晶的内部结构和表面形貌。此外，变形孪晶附近的局部循环塑性应变和应力集中不仅导致了早期的、发育良好的PSMs，而且导致了即使在低宏观应力幅度下TWIP和TRIP塑性的激活。

向上滑动阅览英文摘要

Cylindrical specimens of CrCoNi alloy with electropolished surfaces were subjected to constant total strain amplitude low cycle fatigue. The alloy exhibited an initial period of cyclic hardening followed by cyclic softening until failure occurred. At the end of hardening stage at the peak of cyclic stress, well-developed persistent slip markings (PSMs) consisting of extrusions and intrusions were associated with thin deformation twins. A sophisticated experimental workflow was designed to extract information from the surface and the bulk of tested material. A combination of SEM, EBSD, ECCI, FIB and HR-STEM was used to study the internal structure and the surface profiles around the deformation twins, which were produced during the initial period of cyclic loading. Furthermore, localized cyclic plastic strain and stress concentrations near deformation twins led not only to early, well-developed PSMs, but also to the activation of TWIP and TRIP plasticity even at low macroscopic stress amplitudes.

 

 

SCRIPTA

Vol. 202, 1 Sep. 2021, 113992

4. High strength NiMnFeCrAlCu multi-principal-element alloys with marine application perspective

高强度NiMnFeCrAlCu多主元素合金在海洋中的应用前景

 

Yidong Wu, Yuluo Li, Xuli Liu, Qinjia Wang, Xiaoming Chen, Xidong Hui✉

Xidong Hui: xdhui@ustb.edu.cn  北京科技大学

https://doi.org/10.1016/j.scriptamat.2021.113992

 

摘要

镍铝青铜(NAB)合金是传统的海洋材料，使用了几十年，但面临着强度和腐蚀性能不足的问题。在本研究中，我们开发了新型NiMnFeCrAlCu多主元素合金(MPEA)，由于其具有很强的固溶强化、耐腐蚀和抗生物结垢能力，该合金具有良好的力学性能和耐腐蚀性能。结果表明，与NBA相比，NiMnFe0.5Cr0.5Al0.2Cu1.2 MPEA具有较高的屈服强度和抗拉强度，腐蚀电流密度低1个数量级，且具有较好的铜离子释放浓度。这些优点主要归因于FCC+BCC双相组织，以及Cu在FCC基体中富集和Cr在BCC晶粒中富集。这项工作对发展先进海洋材料的新战略具有重要意义。

向上滑动阅览英文摘要

Nickel-aluminium bronze (NAB) alloys are traditional marine materials used for decades, but face to the challenge of insufficient strength and corrosion properties. In this work, thanks to the strong solid solution strengthening, corrosion and biofouling resistant ability of multiple components, we developed novel NiMnFeCrAlCu multi-principal-element alloys (MPEAs), which exhibit excellent combination of mechanical and corrosion resistant properties. It was found that NiMnFe0.5Cr0.5Al0.2Cu1.2 MPEA has higher yield and ultimate tensile strength, and lower corrosion current density by one magnitude than those of NBA, and also shows a considerable copper ion release concentration. These merits are attributed to the dual phase of FCC+BCC, and the enrichment of Cu in the FCC matrix and Cr in the BCC grains. This work has implication in the new strategy for the development of advanced marine materials.

 

 

SCRIPTA

Vol. 202, 1 Sep. 2021, 113998

5. Vacancy surface migration mechanisms in dilute nickel-chromium alloys

稀Ni-Cr合金中的空位表面迁移机制

 

Jacob Startt, Chaitanya Deo, Rémi Dingreville✉

Rémi Dingreville: rdingre@sandia.gov 

https://doi.org/10.1016/j.scriptamat.2021.113998

 

摘要

我们用第一性原理计算研究了稀Ni-Cr合金中与表面空位迁移有关的单一机制。我们调查了一套完整表面和(100)自由表面附近空位的亚表面迁移路径，并计算了相应的迁移势垒。结果表明，向自由表面迁移的空位会面临较低的能垒，其通过与邻近的Cr原子交换而不是与Ni原子交换来进行迁移。一旦一个空位到达自由表面，它就会被困在那里。结果还表明，当一个Cr原子位于自由表面下方的原子面时，导致亚表面Cr原子上方的空位的任何面内空位跃迁在能量上都是不利的。综上所述，这些基本的单一表面迁移机制为Ni-Cr基合金表面偏析和空位迁移现象之间的复杂交互作用提供了见解。

向上滑动阅览英文摘要

 

We investigate the unitary mechanisms related to the surface migration of vacancies in dilute Ni-Cr alloys via first-principle calculations. We survey a complete set of surface and sub-surface migration paths for vacancies near the (100) free surface and calculate the corresponding migration barriers. Our results show that a vacancy migrating towards the free surface will face lower energy barriers to migrate via atomic exchange with a neighboring Cr atom rather than with a Ni atom. Once a vacancy reaches the free surface, it will be trapped there. Our results also reveal that, when a Cr atom sits in the atomic plane just below the free surface, any in-plane vacancy hopping jump that would result in the vacancy sitting on top a subsurface Cr atom is energetically unfavorable. Taken together, these fundamental unitary surface migration mechanisms offer insights into the complex interactions between surface segregation and vacancy migration phenomena in Ni-Cr-based alloys.

 

 

SCRIPTA

Vol. 202, 1 Sep. 2021, 114004

6. Effect of alloying elements on the coarsening rate of γʹ precipitates in multi-component CoNi-based superalloys with high Cr content

合金元素对高Cr多组分CoNi基高温合金γʹ析出相粗化速率的影响

 

Xiaoli Zhuang, Stoichko Antonov, Longfei Li✉, Qiang Feng

Longfei Li: lilf@skl.ustb.edu.cn  北京科技大学

https://doi.org/10.1016/j.scriptamat.2021.114004

 

摘要

研究了高(14 at.%) Cr含量的多组分CoNi基高温合金在850℃的长期时效过程中γ'的粗化行为，以及W，Mo或Ti(1 at.%)的添加对于γ/γʹ微观组织的变化、晶格错配和元素配分行为的影响。γ'析出相的粗化行为遵循经典的Lifshitz-Slyozov-Wagner(LSW)模型，其尺寸与t1/3成比例关系。添加W，Mo或Ti（1at％）改变γ/γ'元素分配行为，从而改变γ/γ'的晶格错配度和界面能，导致γ'析出相的粗化速率相当不同，其中Ti具有最显著的影响。结果发现Cr是γ'粗化的速率限制元素，而不是其他合金元素。该研究可以为具有较低γ'粗化速率的CoNi基高温合金的设计和优化提供指导。

向上滑动阅览英文摘要

 

The γʹ coarsening behavior during long-term aging at 850°C of multi-component CoNi-based superalloys with high (14 at.%) Cr content were investigated, and the effects of W, Mo or Ti (1 at.%) additions were analyzed with respect to the change in the γ/γʹ microstructure, lattice misfit, and elemental partitioning behavior. The coarsening behavior of the γʹ precipitates follows the classical Lifshitz-Slyozov-Wagner (LSW) model, where the size is proportional to t1/3. The addition of either W, Mo or Ti (1 at.%) alters the γ/γʹ elemental partitioning behavior and thus the γ/γʹ lattice misfit and interfacial energy, resulting in quite different coarsening rates of the γʹ precipitates, with Ti having the most significant effect. Cr was found to be the rate-limiting element of γʹ coarsening rather than the other alloying elements. This study could provide guidance for the design and optimization of CoNi-based superalloys with lower γ' coarsening rate.

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SCRIPTA

Vol. 202, 1 Sep. 2021, 114003

7. Dual plateau stress of C15-type topologically close-packed lattice structures additive-manufactured by laser powder bed fusion

通过激光粉末床熔合技术增材制造的C15型拓扑密排晶格结构的双平台应力

 

Xiaoyang Liu✉, Asuka Suzuki, Naoki Takata, Makoto Kobashi, Masaki Kato

Xiaoyang Liu: liu.xiaoyang@e.mbox.nagoya-u.ac.jp

https://doi.org/10.1016/j.scriptamat.2021.114003

 

摘要

模拟晶体结构为设计由节点(充当原子)和支柱(充当原子键)的元胞构成的晶格结构提供了新的途径。我们通过激光粉末床熔合制备了C15 Laves相(AB2型金属间化合物)的拓扑致密(TCP)结构，在晶格结构的应力-应变曲线中发现了独特的双平台区。压缩变形晶格结构的X射线断层扫描和有限元分析表明，两种相对密度不同的单元的存在导致了双平台区。此外，C15晶格结构表现出弯曲和拉伸主导的混合变形模式，在两种应力水平下均能吸收较高的总能量(5.0 MJ·m-3)。

向上滑动阅览英文摘要

 

Imitating crystal structures offers new avenues to design lattice structures composed of unit cells with nodes (act as atoms) and struts (act as atomic bonds). We found out unique dual plateau regions in the stress-strain curves of lattice structures inspired by topologically close-packed (TCP) structure of C15 Laves phase (AB2-type intermetallic compounds) and manufactured via the laser powder bed fusion. X-ray computed tomography of compressively deformed lattice structures as well as finite element analysis revealed that the existence of two kinds of units with different relative density caused the dual plateau regions. In addition, the C15 lattice structures exhibited a hybrid deformation mode of bending- and stretch-dominated deformations and can absorb high total energy of 5.0 MJ·m-3 in two stress levels.

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SCRIPTA

Vol. 202, 1 Sep. 2021, 113995

8. Simultaneous deformation twinning and martensitic transformation in CoCrFeMnNi high entropy alloy at high temperatures

CoCrFeMnNi高熵合金在高温下同时产生变形孪晶和马氏体相变

 

S. Picak, H.C. Yilmaz, I. Karaman✉

I. Karaman: ikaraman@tamu.edu 

https://doi.org/10.1016/j.scriptamat.2021.113995

 

摘要

剧烈塑性变形(SPD)可以通过晶粒细化引起材料的显著强化，然而使用已知的SPD技术制备的材料由于低的应变硬化能力而缺乏均匀的塑性变形。本研究利用等通道转角挤压(ECAP)处理在高温下同时激活CoCrFeMnNi高熵合金(HEA)的孪晶诱导(TWIP)和相变诱导塑性(TRIP)，这是首次报道的高温异常现象。透射电镜和电子背散射衍射分析揭示了显微结构特征。在室温拉伸实验中，相变区和孪晶区以及晶粒细化产生了高强度(~1 GPa)和均匀的塑性变形能力。TWIP/TRIP的出现归因于ECAP处理过程中的高强度水平和目前HEA相对较低的层错能。

向上滑动阅览英文摘要

 

Severe plastic deformation (SPD) leads to substantial strengthening in materials via grain refinement, however, the main drawback of the materials processed using known SPD techniques is the lack of uniform plastic deformation due to low strain hardening capability. In this study, equal channel angular pressing (ECAP) at high temperatures was utilized to activate simultaneous twinning-induced (TWIP) and transformation-induced plasticity (TRIP) in the CoCrFeMnNi high entropy alloy (HEA), which are anomalous at high temperatures and reported for the first time. Transmission electron microscopy and electron backscattered diffraction analysis were performed to reveal microstructural features. The presence of the transformed and twinned regions as well as grain refinement in this alloy yielded a high strength level (around 1 GPa) with uniform plastic deformation ability in room temperature tension experiments. The observation of TWIP/TRIP was attributed to high strength levels applied via ECAP and relatively low stacking fault energy of the present HEA.

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