Materials Characterization最新文献

英文中文

Effect of chemical composition variations in refractory Hf-Nb-Ta-Ti-Zr-Mo-V-Si complex concentrated alloys on the structure, mechanical properties, and oxidation behaviour

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-17 DOI: 10.1016/j.matchar.2025.114856

N. Yurchenko , V. Mirontsov , E. Mishunina , N. Stepanov

In this study, the structure, mechanical properties, and oxidation behaviour of the arc-melted (HfNbTaTiZr)₈₄Si₁₆, (HfMoNbTaTiZr)₈₄Si₁₆, and (HfMoNbTaTiVZr)₈₄Si₁₆ refractory complex concentrated alloys (RCCAs) were investigated. All the three alloys exhibited composite-like microstructures. The (HfNbTaTiZr)₈₄Si₁₆ alloy had a dual-phase structure consisting of the bcc and hexagonal Me₅Si₃ phases. Alloying with Mo or Mo and V resulted in the formation of an additional orthorhombic HfMoSi-type phase. The (HfNbTaTiZr)₈₄Si₁₆ alloy showed the lowest strength at 22–1200 °C, but the highest room-temperature plastic strain among the alloys studied. Additions of Mo or Mo and V were found to improve strength and reduce plasticity. At 1400 °C, all the alloys softened rapidly and became highly deformable. The (HfNbTaTiZr)₈₄Si₁₆ alloy exhibited the fracture toughness of ∼15 MPa m^1/2, which was twice higher than those of the (HfMoNbTaTiZr)₈₄Si₁₆ and (HfMoNbTaTiVZr)₈₄Si₁₆ alloys. The (HfNbTaTiZr)₈₄Si₁₆ alloy demonstrated the near-parabolic oxidation kinetics, the lowest mass gain (∼66 mg cm⁻²) after 48 h, and the longest time (24 h) to edge swelling during the oxidation tests at 1200 °C. Alloying with Mo or Mo and V aggravated the oxidation resistance, decreasing the time to edge swelling or complete disintegration to 6 h. With the values of ∼15 MPa m^1/2 and ∼66 mg cm⁻², the (HfNbTaTiZr)₈₄Si₁₆ alloy was among the toughest and most oxidation-resistant RCCAs and Nb-based silicides to date. The relationships between the chemical composition, structure, mechanical properties, and oxidation behaviour of the alloys studied were thoroughly analysed and discussed.

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引用次数: 0

An Al matrix composite reinforced with carbon nanotubes, Al3BC, and γ-Al2O3: Investigation of mechanical, thermal, and wear resistance properties

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-15 DOI: 10.1016/j.matchar.2025.114854

Jingyi Hu, Tong Gao, Guiliang Liu, Jingbin Liu, Wenhua Xu, Xiangfa Liu

Carbon nanotubes (CNTs), with their exceptional theoretical modulus of elasticity, are among the most promising materials for reinforcing aluminum matrix composites. However, weak mechanical bonds formed between CNTs and the matrix, along with the formation of the brittle Al₄C₃ phase at the interface, often result in a deterioration of the composite's mechanical properties. In this study, a (CNTs+Al₃BC + Al₂O₃)/Al-Zn-Cu composite was fabricated through ball milling, sintering, hot extrusion, and solution treatment. The resulting composite exhibits Young's modulus of 98.1 GPa and ultimate tensile strength of 536 MPa, along with improved thermal properties and wear resistance. The primary strengthening mechanism includes the reinforcement provided by in-situ γ-Al₂O₃ and the CNTs encased by high-modulus in-situ generated Al₃BC particles. This research offers novel insights for the design of high-modulus, high-strength synergistic Al-CNTs composites.

引用次数: 0

The novel high-entropy alloy filler realized the efficient inhibition of the violent reaction and brittle phase formation in the SiCf/SiC heterogeneous brazed joint

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-15 DOI: 10.1016/j.matchar.2025.114849

Yu Zhang , Wei Guo , Han Mei , Xiang Kong , Ying Zhu , Xiaoguang Li , Wei Zhao , Hongqiang Zhang

Based on the significant needs of the high thrust-to-weight ratio aero engines, the new SiC_f/SiC composites and superalloy brazed joints in the hot-end components was proposed, aiming to the controllability and considerable residual stress of SiC_f/SiC heterogeneous joints. The self-developed high-entropy alloy (HEA) AlTiCoCrCu filler was used to realize the homogeneous brazing of SiC_f/SiC, and then upgraded to AlTiCoCrCuRe filler to discover the high-performance of SiC_f/SiC heterogeneous joints. The microstructure regulation of heterogeneous brazed joints was studied, and the brittle phases decreased sharply without defects after upgrading HEA filler. Adding a small amount of Re effectively inhibited the violent diffusion of asymmetric interfacial elements and significantly reduced Ni₂Si brittle phases, the source of harm to tissue properties. The microstructure and phase composition of the brazed joint were clarified, and the strengthening mechanism of the upgraded components of HEA filler on the microstructure and the regulation mechanism of solidification at the heterogeneous interface were revealed. The joint shear strength was significantly better than that of traditional commercial filler, and the filler upgrade improved the “structure-performance” synergy. The research results provided a unique high-temperature HEA filler and theoretical basis for the shape-performance control of SiC_f/SiC composites brazing of aero engines.

{"title":"The novel high-entropy alloy filler realized the efficient inhibition of the violent reaction and brittle phase formation in the SiCf/SiC heterogeneous brazed joint","authors":"Yu Zhang , Wei Guo , Han Mei , Xiang Kong , Ying Zhu , Xiaoguang Li , Wei Zhao , Hongqiang Zhang","doi":"10.1016/j.matchar.2025.114849","DOIUrl":"10.1016/j.matchar.2025.114849","url":null,"abstract":"<div><div>Based on the significant needs of the high thrust-to-weight ratio aero engines, the new SiC<sub>f</sub>/SiC composites and superalloy brazed joints in the hot-end components was proposed, aiming to the controllability and considerable residual stress of SiC<sub>f</sub>/SiC heterogeneous joints. The self-developed high-entropy alloy (HEA) AlTiCoCrCu filler was used to realize the homogeneous brazing of SiC<sub>f</sub>/SiC, and then upgraded to AlTiCoCrCuRe filler to discover the high-performance of SiC<sub>f</sub>/SiC heterogeneous joints. The microstructure regulation of heterogeneous brazed joints was studied, and the brittle phases decreased sharply without defects after upgrading HEA filler. Adding a small amount of Re effectively inhibited the violent diffusion of asymmetric interfacial elements and significantly reduced Ni<sub>2</sub>Si brittle phases, the source of harm to tissue properties. The microstructure and phase composition of the brazed joint were clarified, and the strengthening mechanism of the upgraded components of HEA filler on the microstructure and the regulation mechanism of solidification at the heterogeneous interface were revealed. The joint shear strength was significantly better than that of traditional commercial filler, and the filler upgrade improved the “structure-performance” synergy. The research results provided a unique high-temperature HEA filler and theoretical basis for the shape-performance control of SiC<sub>f</sub>/SiC composites brazing of aero engines.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"222 ","pages":"Article 114849"},"PeriodicalIF":4.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation, properties, and application exploration of electrolytic Cu-CNTs composite foils

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-15 DOI: 10.1016/j.matchar.2025.114855

Yu Wang , Zixuan Tan , Yujie Li , Linzhi He , Yong Zhang , Xiaowu Hu , Jie Chen , Meirong Yi , Guangbin Yi

Carbon nanotubes (CNTs) reinforced Cu matrix composites are a hotspot of current research, but the majority of them are bulk samples by sintered or die-cast formed. There are few works on preparing large-size and ultrathin Cu-CNTs composite foils (CCFs) by electrodeposition with the process and environment imitating industrial production of electrolytic Cu foils, and investigating the properties and application potential of CCFs. Herein, large-sized and ultrathin CCFs were prepared via electrodeposition with a high current density (0.5 A/cm²), a short deposition time (120 s), and a large volume of circulating electrolyte (70 L). The microstructure, mechanical properties, surface roughness, and resistivity of the CCFs were investigated. The foils with CNTs of 50 mg/L exhibited the best overall performance, with a tensile strength of 550 MPa (25 °C) and elongations of 4.9 % (25 °C) and 13.2 % (180 °C), representing improvements of 66.7 %, 88.5 %, and 135.7 % respectively, compared with that of the pure Cu foil. Load transfer and the Orowan mechanism together strengthened the CCFs. The elongation of CCFs demonstrated stability in response to the content of CNTs both at room and at elevated temperatures, which may be attributed to the “pulled out” effect of CNTs. The potential applications of CCFs in printed circuit boards and lithium-ion batteries were explored, the use of CNTs may lead to adverse effects such as surface discoloration, pinholes, and compromised soldering reliability. The CCFs with a low dosage of CNTs showed promising overall performance, indicating a viable pathway for future research.

碳纳米管（CNTs）增强铜基复合材料是当前的研究热点，但大多数都是烧结或压铸成型的块状样品。通过电沉积制备大尺寸和超薄铜-碳纳米管复合箔（CCFs）并研究其性能和应用潜力的研究较少。本文采用高电流密度（0.5 A/cm2）、短沉积时间（120 s）和大容量循环电解液（70 L）电沉积法制备了大尺寸超薄 CCF。研究了 CCF 的微观结构、机械性能、表面粗糙度和电阻率。与纯铜箔相比，含有 50 mg/L CNT 的铜箔表现出最佳的综合性能，抗拉强度达到 550 MPa（25 °C），伸长率为 4.9 %（25 °C）和 13.2 %（180 °C），分别提高了 66.7 %、88.5 % 和 135.7 %。载荷传递和奥罗恩机制共同增强了 CCF。在室温和高温条件下，CCF 的伸长率随碳纳米管含量的变化而稳定，这可能归因于碳纳米管的 "拉出 "效应。研究还探讨了 CCFs 在印刷电路板和锂离子电池中的潜在应用，CNTs 的使用可能会导致表面褪色、针孔和焊接可靠性受损等不良影响。低剂量 CNT 的 CCF 显示出良好的整体性能，为未来的研究指明了一条可行的道路。

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引用次数: 0

Comparison of Kikuchi diffraction geometries in the scanning electron microscope

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-15 DOI: 10.1016/j.matchar.2025.114853

Tianbi Zhang , Lukas Berners , Jakub Holzer , T. Ben Britton

Recent advances in scanning electron microscope (SEM) based Kikuchi diffraction have demonstrated the important potential for transmission and reflection methods, like transmission Kikuchi diffraction (TKD) and electron backscatter diffraction (EBSD). Furthermore, with the advent of compact direct electron detectors (DED) it has been possible to place the detector in a variety of configurations within the SEM chamber. This motivates the present work where we explore the similarities and differences of the different geometries that include on-axis TKD & off-axis TKD using electron transparent samples, as well as more conventional EBSD. Furthermore, we compare these with the newest method called “reflection Kikuchi diffraction” RKD where the sample is placed flat in the chamber and the detector is placed below the pole piece. Through remapping collected diffraction patterns, all these methods can be used to generate an experimental “diffraction sphere” that can be used to explore diffraction from any scattering vector from the unit cell, as well as the ability to perform band profile analysis. This diffraction sphere approach enables us to further probe specific differences between the methods, including for example thickness effects in TKD that can result in the generation of diffraction spots, as well as electron scattering path length effects that result in excess and deficiency variations, as well as inversion of bands in experimental patterns.

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引用次数: 0

Effect of interlayer temperature on the microstructure and mechanical properties of new Co-Free maraging steel fabricated by arc-based directed energy deposition

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-14 DOI: 10.1016/j.matchar.2025.114851

Pengfei Gao , Jikang Fan , Baihao Cai , Jian Zhang , Dongqing Yang , Yong Peng , Kehong Wang

To establish process standards for arc-based directed energy deposition (DED-Arc) of the self-developed, low-cost Co-free maraging steel welding wire, the effect of different interlayer temperatures (50 °C and 350 °C) on the microstructure and mechanical properties of thin-walled components was studied. At an interlayer temperature of 50 °C, the average grain size of the specimens reached 14.06 μm, with high-angle grain boundaries (HAGBs) accounting for 49.5 %. The austenite content was 6.8 %, and the geometrically necessary dislocation (GND) density was 1.99 × 10¹⁴ m⁻². When the interlayer temperature was increased to 350 °C, the average grain size increased significantly to 31.33 μm, accompanied by a decrease in the proportion of HAGBs to 45.5 %. Additionally, the austenite content rose to 11.8 %, while the GND density decreased to 1.71 × 10¹⁴ m⁻². For specimens tested at an interlayer temperature of 50 °C, the tensile strength in the X-direction reached 1211.8 MPa with an elongation of 11.7 %, while in the Z-direction, it was 1186.6 MPa with an elongation of 8.7 %. However, increasing the interlayer temperature to 350 °C resulted in a decrease in tensile strength to 996.8 MPa and an increase in elongation to 23.4 % for X-direction specimens. Similarly, in the Z-direction, the tensile strength decreased to 969.1 MPa with an elongation of 22.2 %. Notably, increasing the interlayer temperature from 50 °C to 350 °C significantly enhanced impact toughness by adding up to 42.5 J/cm² for X-direction specimens and by 32.4 J/cm² for Z-direction specimens. The microhardness values of the deposited components were 352.4 HV and 300.3 HV at interlayer temperatures of 50 °C and 350 °C, respectively.

{"title":"Effect of interlayer temperature on the microstructure and mechanical properties of new Co-Free maraging steel fabricated by arc-based directed energy deposition","authors":"Pengfei Gao , Jikang Fan , Baihao Cai , Jian Zhang , Dongqing Yang , Yong Peng , Kehong Wang","doi":"10.1016/j.matchar.2025.114851","DOIUrl":"10.1016/j.matchar.2025.114851","url":null,"abstract":"<div><div>To establish process standards for arc-based directed energy deposition (DED-Arc) of the self-developed, low-cost Co-free maraging steel welding wire, the effect of different interlayer temperatures (50 °C and 350 °C) on the microstructure and mechanical properties of thin-walled components was studied. At an interlayer temperature of 50 °C, the average grain size of the specimens reached 14.06 μm, with high-angle grain boundaries (HAGBs) accounting for 49.5 %. The austenite content was 6.8 %, and the geometrically necessary dislocation (GND) density was 1.99 × 10<sup>14</sup> m<sup>−2</sup>. When the interlayer temperature was increased to 350 °C, the average grain size increased significantly to 31.33 μm, accompanied by a decrease in the proportion of HAGBs to 45.5 %. Additionally, the austenite content rose to 11.8 %, while the GND density decreased to 1.71 × 10<sup>14</sup> m<sup>−2</sup>. For specimens tested at an interlayer temperature of 50 °C, the tensile strength in the X-direction reached 1211.8 MPa with an elongation of 11.7 %, while in the <em>Z</em>-direction, it was 1186.6 MPa with an elongation of 8.7 %. However, increasing the interlayer temperature to 350 °C resulted in a decrease in tensile strength to 996.8 MPa and an increase in elongation to 23.4 % for X-direction specimens. Similarly, in the <em>Z</em>-direction, the tensile strength decreased to 969.1 MPa with an elongation of 22.2 %. Notably, increasing the interlayer temperature from 50 °C to 350 °C significantly enhanced impact toughness by adding up to 42.5 J/cm<sup>2</sup> for X-direction specimens and by 32.4 J/cm<sup>2</sup> for <em>Z</em>-direction specimens. The microhardness values of the deposited components were 352.4 HV and 300.3 HV at interlayer temperatures of 50 °C and 350 °C, respectively.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"222 ","pages":"Article 114851"},"PeriodicalIF":4.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective strengthening and toughening in multi-principal elements alloy via Nb addition at elevated temperature 高温下通过添加铌实现多主元素合金的有效强化和增韧

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-14 DOI: 10.1016/j.matchar.2025.114852

Y. Shi , S.N. Lan , J.Q. Yao , H.J. Huang , K. Wang , S.R. Li , X.W. Liu , Z.T. Fan

The strength-ductility trade-off of alloys has always been one of the key issues hindering the development of the metal industry. Herein, we found that the minor addition of Nb could strength FCC/BCC and BCC/B2 phase boundaries of multi-principal elements alloy (MPEA) and promoted the content of BCC phases. The ultimate tensile strength over 920 MPa with uniform elongation of 34.1 % at 873 K is accomplished in Fe_31.75Ni_27.75Cr₂₅Al₁₀Ti₅Nb_0.5 MPEA, which increased by 101.8 % in uniform elongation and 23.0 % in ultimate tensile strength in comparison to the Fe₃₂Ni₂₈Cr₂₅Al₁₀Ti₅ MPEA. These findings provide a microalloying strategy to upgrade high-temperature mechanical properties within a strength and ductility window perhaps more effectively than existing strengthening and toughening approaches.

引用次数: 0

Structural differences between single crystalline and polycrystalline NiMnGa-based alloys

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-14 DOI: 10.1016/j.matchar.2025.114850

A. Szewczyk , A. Wójcik , W. Maziarz , N. Schell , R. Chulist

Three different martensitic crystal structures i.e. 10M, 14M, and NM of NiMnGa-based alloys, occurring in different forms, such as powders, polycrystalline melt-spun ribbons, and bulk single crystals were characterized in detail. The crystal structure of materials having the same chemical compositions and martensitic structures but existing in different forms were evaluated using high-energy synchrotron radiation, showing significant changes in lattice parameters. Additionally, the samples examined by high-resolution TEM imaging and electron diffraction showed local structure changes including variations of stacking fault sequence, and lattice distortion at the grain and twin boundaries. The changes in lattice parameters of unit cells as well as the intensity of modulation reflections have been discussed in terms of microstructure (single variant, multivariant state), internal stresses, dislocation density, atomic shuffling, periodic and partially periodic atom displacements. Moreover, the effect of heat treatment on microstrain level, dislocation density, and formation of martensitic structures was investigated.

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引用次数: 0

Microstructural development via synergic application of Binder jJetting and Quenching and Partitioning (QP) on commercial AISI 4340

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-13 DOI: 10.1016/j.matchar.2025.114839

M. Belfi , M. Mariani , P. Martin , M. Santofimia , A. Gruttadauria , F. Deirmina , N. Lecis , S. Barella

This study investigates the microstructural development of commercial low-alloyed AISI 4340 steel through the synergistic application of Binder Jetting and Quenching and Partitioning (QP) processes. The material in the as-sintered condition exhibited significant variations in microstructure and mechanical properties, primarily influenced by the processing route. Carbon content was influenced by the building technique as decarburization was observed at different intensities mainly during the heating stage of sintering, driven by carbothermic reduction. Vacuum-debinding was found to be optimal, leading to the most homogeneous microstructure, predominantly granular bainite with superior hardness and tensile strength. Different QP treatments were optimized considering the decarburization effect on the optimal as-sintered condition, stabilizing 4–8 % retained austenite in a martensitic matrix, with optimal results observed after isothermal holding at either 220 °C or 240 °C for 30 min. These conditions resulted in high UTS values of 1231 MPa and 1151 MPa, respectively, compared to 750 MPa in the as-sintered state. Despite high tensile properties, A% was limited by the presence of residual porosity. This study highlights the critical importance of controlled debinding and sintering atmospheres as well as decarburization-informed QP treatments in achieving desirable microstructural and mechanical properties in additively manufactured AISI 4340 steel components.

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引用次数: 0

Microstructural characterization to reveal evidence of shock deformation in a Campo del Cielo meteorite fragment

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-13 DOI: 10.1016/j.matchar.2025.114838

Graeme J. Francolini, T. Benjamin Britton

For materials scientists and engineers, the extreme and unusual conditions in which meteorites and their microstructures form allow for insight into materials which would exist at the edge of our thermomechanical processing abilities. One such microstructure found in low-shock event iron meteorites is Neumann bands. These bands are arrays of lenticular deformation twins that form throughout the FeNi matrix with numerous intersections, resulting in many high stress and strain regions within the material's surface. These regions and the shocks that formed them encourage atypical strain accommodating mechanisms and structural changes of the material. However, investigation of the deformation twin intersections and the microstructural behaviour in and around these regions has been limited. In this work, investigation of these regions in a Campo del Cielo meteorite fragment, with electron backscatter diffraction (EBSD) and forescatter electron (FSE) imaging, revealed two primary findings: high-intensity pattern doubling mirrored across the {110} band at twin-twin intersection and microband formation across the sample surface, suggesting multilayer twinning and constraint of the crystal structure at twin-twin intersection points. Microbands were found to form along the {110} plane and in regions near Neumann bands. The simultaneous existence of Neumann bands (microtwins) and microbands is presented here for a BCC material, and it is believed the Neumann band and microbands formed during different types and/or shock events from one another. The presence of both Neumann bands and microbands within a BCC iron meteorite is previously unreported and may be valuable in furthering our understanding of shock deformation within iron-based materials.

对于材料科学家和工程师来说，陨石及其微观结构形成的极端和不寻常条件，使他们能够深入了解我们热机械加工能力边缘的材料。在低冲击事件铁陨石中发现的一种微结构是诺伊曼带。这些条带是在整个铁镍基体中形成的透镜状变形孪晶阵列，有许多交叉点，从而在材料表面形成许多高应力和高应变区域。这些区域以及形成这些区域的冲击促进了材料的非典型应变容纳机制和结构变化。然而，对变形孪晶交叉以及这些区域内和周围的微观结构行为的研究还很有限。在这项研究中，利用电子反向散射衍射（EBSD）和前向散射电子（FSE）成像技术对 Campo del Cielo 陨石碎片中的这些区域进行了研究，发现了两个主要发现：在孪晶交汇处的{110}带和样品表面的微带形成了高强度的图案加倍镜像，这表明在孪晶交汇点存在多层孪晶和晶体结构约束。微带是沿着{110}平面和靠近诺伊曼带的区域形成的。这里提出了同时存在 Neumann 带（微孪晶）和微带的 BCC 材料，并认为 Neumann 带和微带是在不同类型和/或彼此不同的冲击事件中形成的。在 BCC 铁陨石中同时存在 Neumann 带和微带是以前从未报道过的，这对我们进一步了解铁基材料的冲击变形可能很有价值。

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