Philosophical Magazine Letters最新文献

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Notch sensitivity of combined mode I–II fracture behaviour of a rolled magnesium alloy 轧制镁合金I–II型复合断裂行为的缺口敏感性

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2023-02-14 DOI: 10.1080/09500839.2023.2173989

Dhrubjyoti Baruah, K. Vaishakh, S. Sreedhar, S. K. Gupta, S. Suwas, R. Narasimhan

引用次数: 1

Comparative study of microstructure and mechanical properties of thermo-mechanically processed Al(0.2, 0.5) CoCrFeNiMo0.5 high-entropy alloys 热机械加工Al(0.2, 0.5) CoCrFeNiMo0.5高熵合金组织与力学性能的比较研究

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2023-02-14 DOI: 10.1080/09500839.2023.2170490

Yasam Palguna, Rajesh Korla

引用次数: 0

Effect of ultrasonic treatment on grain refinement and mechanical properties of Al-2Mg alloy 超声处理对Al-2Mg合金晶粒细化及力学性能的影响

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2023-01-12 DOI: 10.1080/09500839.2022.2162617

A. Thakur, R. Gupta, V. Udhayabanu, D. Peshwe, Y. Mahajan

引用次数: 0

Prospect for application of radial distribution function in coal carbonisation research 径向分布函数在煤碳化研究中的应用前景

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2022-12-02 DOI: 10.1080/09500839.2022.2155721

Xiaoxia Shang, Meijun Wang, Zhihong Li, L. Chang, Yanfeng Shen

ABSTRACT Carbonisation is an important way of comprehensive utilisation of coal. In this short contribution, the application of wide angle X-ray scattering (WAXD) and radial distribution function (RDF) in coal carbonisation research is briefly reviewed and prospected. General WAXD analysis can only provide basic geometrical structural parameters of crystals in the sample; while RDF derived from WAXD by Fourier transform can give further detailed structural parameters of coordination of atoms in sample. The application of RDF in coal science has been reported in offline static studies, but not in-situ studies. Here, a new ideal to perform in-situ RDF study on coal carbonisation is presented, which is based on a powerful synchrotron radiation platform with a proper detector and a high-temperature furnace. Thus, it is expected to obtain the fine dynamic structural evolution characteristics of coal during carbonisation.

摘要炭化是煤炭综合利用的重要途径。在这篇简短的文章中，简要回顾和展望了广角X射线散射（WAXD）和径向分布函数（RDF）在煤碳化研究中的应用。一般WAXD分析只能提供样品中晶体的基本几何结构参数；而通过傅立叶变换从WAXD中导出的RDF可以进一步给出样品中原子配位的详细结构参数。RDF在煤炭科学中的应用已经在离线静态研究中报道，但没有在现场研究中报道。在这里，提出了一种新的理想方法来对煤的碳化进行原位RDF研究，该方法基于一个强大的同步辐射平台，该平台配有合适的探测器和高温炉。因此，有望获得煤在碳化过程中精细的动态结构演化特征。

引用次数: 1

Deformation behavior at cryogenic temperature in extruded Mg–Al–Zn alloy 挤压Mg–Al–Zn合金的低温变形行为

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2022-11-18 DOI: 10.1080/09500839.2022.2143592

H. Somekawa, Yukiko Ogawa, Y. Ono, Ashutosh Kumar Singh

ABSTRACT The effect of grain size on tensile deformation behaviors at room- and cryogenic-temperatures was examined using extruded Mg–Al–Zn (AZ31) alloys with different average grain sizes of 3.7, 14.0, and 38.7 μm. The mechanical properties were influenced by the grain size as well as the testing temperature. Strength increased with a finer grained structure and a lower testing temperature. Regarding the elongation-to-failure in tension, all the alloys tested at cryogenic-temperature exhibited about half the values of those at room-temperature. Deformed microstructural observations revealed that deformation twins formed in the alloys with coarse- and meso-grained structures, but decreased with grain refinement. The reduction of twin formation at both room- and cryogenic-temperatures is due to enhancement of grain boundary plasticity. Contrary to our expectation, it is interesting to note that grain boundary compatibility contributes to activation of non-basal dislocation slips, irrespective of testing temperatures. In addition, dislocation slips lead to occurrence of strain hardening after yielding even at 77 K.

采用平均晶粒尺寸为3.7、14.0和38.7 μm的挤压Mg-Al-Zn (AZ31)合金，研究了晶粒尺寸对室温和低温拉伸变形行为的影响。晶粒尺寸和测试温度对材料的力学性能均有影响。晶粒越细，测试温度越低，强度越高。在低温条件下，所有合金的拉伸延伸失效率都只有室温条件下的一半左右。变形组织观察表明，在粗晶和中晶合金中形成变形孪晶，但随晶粒细化而减少。室温和低温下孪晶形成的减少是由于晶界塑性的增强。与我们的预期相反，有趣的是，无论测试温度如何，晶界相容性都有助于非基底位错滑移的激活。此外，位错滑移导致即使在77 K屈服后也发生应变硬化。

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引用次数: 1

Structure evolution of vacancy-hydrogen complexes in a nickel-based single-crystal superalloy 镍基单晶高温合金中空位-氢配合物的结构演变

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2022-11-12 DOI: 10.1080/09500839.2022.2145026

Xiaozhi Tang, Xiao-Tong Li, Ya-Fang Guo

ABSTRACT The structural stability of vacancy-hydrogen complexes at the interface in nickel-based single-crystal superalloy is accessed mainly by calculating the activation energies associated with the evolution of their structures. It is found that the structure evolution and subsequent decomposition of the complex needs little time to be thermally activated at the service temperature of an aeroengine, and misfit dislocations at the interface significantly reduces the energy barrier for decomposition. Therefore, during the creep process, which is more severe at high temperatures, vacancies around misfit dislocations are not expected to enhance hydrogen interfacial segregation, although vacancy-hydrogen complexes are quite stable at room temperature.

摘要镍基单晶高温合金界面空位-氢配合物的结构稳定性主要通过计算其结构演变的活化能来获得。研究发现，在航空发动机工作温度下，该配合物的结构演化和后续分解所需的热激活时间较短，界面处的错配位错显著降低了分解的能垒。因此，在高温下更为剧烈的蠕变过程中，尽管空位-氢配合物在室温下相当稳定，但失配位错周围的空位并不会增强氢界面的偏析。

引用次数: 0

Effect of size and vacancy defects on buckling properties of arsenene nanosheets 尺寸和空位缺陷对亚砷酸纳米片屈曲性能的影响

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2022-11-07 DOI: 10.1080/09500839.2022.2140216

Zhenyu Sun, Guili Liu, Juan Guo

ABSTRACT Vacancy defects and size variations are inevitable in the preparation of arsenene nanosheets, and the effect of size and random distribution of vacancy defects on the buckling properties of arsenene nanosheets is not negligible. Previous research methods, such as molecular dynamics, have limitations in terms of computational cost when investigating this aspect. In this paper, a model of arsenene nanosheets is developed based on the finite element method and the buckling properties of arsenene nanosheets are investigated under various operating conditions such as different sizes, different orientations and the presence of vacancy defects. The results show that the buckling performance of arsenene nanosheets is enhanced by smaller size. In contrast, the presence of vacancy defects leads to the destruction of the original structure of arsenene nanosheets, resulting in a decrease in their buckling properties. This study provides an important contribution to the investigation of the buckling properties of arsenene nanosheets.

摘要在制备亚砷酸纳米片的过程中，空位缺陷和尺寸变化是不可避免的，空位缺陷的尺寸和随机分布对亚砷酸纳米片屈曲性能的影响不容忽视。以前的研究方法，如分子动力学，在研究这一方面时，在计算成本方面存在局限性。本文基于有限元方法建立了亚砷酸纳米片的模型，研究了亚砷酸纳米片在不同尺寸、不同取向和存在空位缺陷等不同操作条件下的屈曲性能。结果表明，尺寸越小，亚砷酸纳米片的屈曲性能越强。相反，空位缺陷的存在会破坏亚砷酸纳米片的原始结构，导致其屈曲性能下降。这项研究为研究亚砷酸纳米片的屈曲性能提供了重要贡献。

引用次数: 1

Preparation and characterisation of the Al-Cr-Fe-Mn-Mo high-entropy alloy reinforced by in-situ formed carbides 原位生成碳化物增强Al-Cr-Fe-Mn-Mo高熵合金的制备及性能

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2022-10-20 DOI: 10.1080/09500839.2022.2134938

T. Stasiak, M. Sow, M. Touzin, F. Béclin, C. Cordier

ABSTRACT This study aimed to prepare a composite of the high-entropy alloy from the Al-Cr-Fe-Mn-Mo system reinforced by in-situ formed carbides using powder metallurgy techniques. The alloyed powder was prepared by mechanical alloying in ball-mill devices from pure elemental powders with the addition of a process control agent, namely stearic acid. Then, the alloyed powder was consolidated by hot-press sintering. The structure and microstructure of powder and bulk samples were investigated. The mechanical properties of the bulk sample were evaluated. The investigations revealed two bcc phases in the mechanically alloyed powder. The powder annealing at 950°C triggered the phase transformations, which led to the formation of the multielement matrix bcc phase (a = 2.91 Å) reinforced by two carbides molybdenum-rich M6C (a = 11.15 Å) and chromium-rich M23C6 (a = 10.66 Å). A similar composite structure was present in the bulk sample. The investigations suggested that the primary carbon source for carbide formation was the process control agent – stearic acid. The produced bulk composite revealed promising mechanical properties, such as very high hardness up to 1223 ± 99 HV2 and Young’s modulus of 246 ± 10 GPa.

摘要本研究旨在利用粉末冶金技术，由原位形成的碳化物增强的Al-Cr-Fe-Mn-Mo体系制备高熵合金复合材料。合金粉末是在球磨机装置中由纯元素粉末通过机械合金化制备的，并添加了过程控制剂，即硬脂酸。然后，通过热压烧结对合金粉末进行固结。研究了粉末和大块试样的结构和微观结构。对大块样品的力学性能进行了评估。研究表明，机械合金粉末中存在两个bcc相。950°C下的粉末退火引发了相变，从而形成了多元基体bcc相（a = 2.91 Å）由两种富含钼的M6C（a = 11.15 Å）和富铬M23C6（a = 10.66 Å）。在大块样品中存在类似的复合材料结构。研究表明，碳化物形成的主要碳源是过程控制剂硬脂酸。所生产的大块复合材料显示出良好的机械性能，例如高达1223的极高硬度 ± 99 HV2和246的杨氏模量 ± 10 GPa。

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引用次数: 1

Influence of Co content on the simultaneous enhancement of strength and ductility in severely drawn textured Ni-Co microwires Co含量对严重拉丝织构Ni-Co微丝强度和延性同时增强的影响

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2022-10-06 DOI: 10.1080/09500839.2022.2129108

Girish Bojjawar, Satyam Suwas, Atul H. Chokshi

ABSTRACT

This study examines the deformation behaviour of Ni-Co microwires exhibiting high strengths and ductility, where the addition of Co is intended to decrease the stacking fault energy. A reduction in stacking fault energy is likely to retard the recovery processes, refine grain size and enhance strain hardening by dislocation interactions at twin boundaries. Microwires were drawn to a strain of 5.88, from annealed Ni-Co alloys with Co content varying from 30 to 60 wt%. Subsequent tensile testing revealed a simultaneous increase in strength and ductility with an increase in Co content. The enhanced strength is a consequence of the finer grain size with an increase in Co, and the larger ductility is related to a combination of greater strain hardening and a higher strain rate sensitivity with an increase in Co. The textured drawn Ni-Co wires exhibited higher strengths than those obtained by severe plastic deformation with comparable grain sizes.

摘要本文研究了具有高强度和延展性的Ni-Co微丝的变形行为，其中Co的添加旨在降低层错能。层错能的降低可能会延缓恢复过程，细化晶粒尺寸，并通过孪晶界的位错相互作用增强应变硬化。将Co含量为30% ~ 60%的退火镍钴合金拉伸至5.88应变的微丝。随后的拉伸试验表明，随着Co含量的增加，强度和延展性同时增加。随着Co含量的增加，晶粒尺寸越细，强度越高，而随着Co含量的增加，应变硬化程度越高，应变率敏感性也越高，因此延展性越好。织构拉伸后的Ni-Co丝的强度比同等晶粒尺寸下通过严重塑性变形获得的强度更高。

引用次数: 0

High-temperature oxidation behaviour of SPS-prepared Mo and Mo–5Ta alloys sps制备Mo和Mo - 5ta合金的高温氧化行为

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters

Pub Date : 2022-10-06 DOI: 10.1080/09500839.2022.2129110

Dawei Liu, Jiuxing Zhang, Lei Huang, Song Li, B. Nong, Ying Jin, Yafei Pan

ABSTRACT The high-temperature oxidation behaviour of SPS-prepared Mo and Mo–5Ta alloys are investigated under the temperature range 300–700°C for 0–120 min in static air condition. The oxidation weight gains of Mo and Mo–5Ta conform to parabolic law at different oxidation times of 500°C and all remain at low levels. At low temperature (≤ 500°C), the oxidation resistance improves with Ta addition. However, at 600°C and 700°C, the oxidation of Mo–5Ta increases and the weight gain is obvious. Compared with pure Mo, a continuous and dense oxide scale can be formed quickly on the surface of Mo–5Ta alloys during the oxidation process at 500°C, which improves the oxidation resistance of the alloys. The volatile MoO3 and generated Ta2O5 above 500°C cause more voids to form in the matrix, resulting in the deterioration of the oxidation resistance of the alloys.

研究了用sps制备的Mo和Mo - 5ta合金在静态空气条件下，在300-700℃温度范围内0-120 min的高温氧化行为。在500℃的不同氧化时间下，Mo和Mo - 5ta的氧化增重符合抛物线规律，均保持在较低水平。在低温(≤500℃)下，随着Ta的加入，其抗氧化性得到提高。而在600℃和700℃时，Mo-5Ta的氧化加剧，重量增加明显。与纯Mo相比，在500℃氧化过程中，Mo - 5ta合金表面可以快速形成连续致密的氧化皮，提高了合金的抗氧化性。500℃以上挥发的MoO3和生成的Ta2O5使基体中形成更多的空洞，导致合金的抗氧化性变差。

引用次数: 1

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