Intermetallics最新文献

英文中文

The diversity of evolution behavior between stoichiometric and non-stoichiometric AlTM intermetallics in Mg melt 镁熔体中化学计量和非化学计量 AlTM 金属间化合物演化行为的多样性

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-15 DOI: 10.1016/j.intermet.2024.108574

Hongfu Su, Jingyi Hu, Mengyu Li, Jingbin Liu, Tong Gao, Xiangfa Liu

In this study, Al-5Ti, Al-18Si-5Ti, Al-12Si-2Sc and Al-12Si-1Sc-1Zr alloys, containing the Al₃Ti, Ti₇Al₅Si₁₂, AlSi₂Sc₂ and AlSi₂(Sc, Zr)₂ particles, respectively, were introduced into a Mg melt to understand the morphological and structural evolution behaviors of AlTM intermetallic compounds. Deposition layers at the bottom of the Mg melt were obtained due to the particle settlement. Scanning electron microscope and X-ray diffraction were employed to analyze the phase morphologies and structures of the AlTM intermetallic compounds in the deposition layers. A morphological transformation, characterized by the cracking of particles into fine clusters, was observed in all these AlTM intermetallic compounds, which is promoted by the inward diffusion of Mg atoms. The phase structures of the final particles remained Al₃Ti and AlSi₂Sc₂ when Al-5Ti and Al-12Si-2Sc alloys were introduced into the Mg melt, indicating no structural evolution. However, structural evolutions were detected from Ti₇Al₅Si₁₂ to Ti₅Si₄ and from AlSi₂(Sc, Zr)₂ to SiScZr when they were introduced in the Mg melt. It is hypothesized that the crystal structure, whether stoichiometric or non-stoichiometric, is closely related to the structural evolution behavior of AlTM intermetallic compounds. This work may provide new insights into phase control by introducing one type of metal matrix master alloy into another metal melt.

本研究将分别含有 Al3Ti、Ti7Al5Si12、AlSi2Sc2 和 AlSi2(Sc, Zr)2 颗粒的 Al-5Ti、Al-18Si-5Ti、Al-12Si-2Sc 和 Al-12Si-1Sc-1Zr 合金引入镁熔体，以了解 AlTM 金属间化合物的形态和结构演变行为。由于颗粒沉降，在镁熔体底部获得了沉积层。利用扫描电子显微镜和 X 射线衍射分析了沉积层中 AlTM 金属间化合物的相形态和结构。在所有这些 AlTM 金属间化合物中都观察到了一种形态转变，其特征是颗粒裂解成细小的团块，这种转变是由镁原子的向内扩散所促进的。在将 Al-5Ti 和 Al-12Si-2Sc 合金引入镁熔体时，最终颗粒的相结构仍为 Al3Ti 和 AlSi2Sc2，这表明没有发生结构演变。然而，在镁熔体中加入 Ti7Al5Si12 和 AlSi2(Sc,Zr)2合金时，却检测到了从 Ti7Al5Si12 到 Ti5Si4 和从 AlSi2(Sc,Zr)2 到 SiScZr 的结构演变。据此推测，晶体结构（无论是化学计量还是非化学计量）与 AlTM 金属间化合物的结构演化行为密切相关。这项工作可能会为在另一种金属熔体中引入一种金属基母合金的相控制提供新的见解。

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引用次数: 0

Improving shape memory effect in Fe-Mn-Si-based alloys by reducing annealing twin boundaries through trace boron doping 通过掺杂微量硼减少退火孪晶边界，改善铁锰硅基合金的形状记忆效应

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-15 DOI: 10.1016/j.intermet.2024.108552

Guoqing Cao , Yanni Luo , Yu Fu, Qilin Wang, Huabei Peng, Yuhua Wen

Previous work has shown that the shape memory effect (SME) exhibited a strong negative dependence on the density of annealing twin boundaries (ATBs) in Fe-Mn-Si-based alloys. Reducing the density of ATBs has thus been an effective way to improve the SME of Fe-Mn-Si-based alloys. This study investigated the effects of trace B doping on the density of ATBs and the resultant SME in solution-treated Fe-Mn-Si-based alloys. Results indicated that doping 89 ppm B effectively reduced the density of ATBs in the solution-treated Fe-Mn-Si-based alloy. Consequently, its SME was remarkably improved. The maximum shape recovery strain reached 2.7 % in the B-doped alloy, 1.3 % higher than in the alloy without B doping. This work demonstrates a new avenue to improve the SME by doping trace B, which is of significance for the fabrication of Fe-Mn-Si-based shape memory alloys in a more cost-effective manner.

以往的研究表明，形状记忆效应（SME）与铁锰硅基合金中退火孪晶边界（ATB）的密度呈强烈的负相关。因此，降低 ATB 的密度是改善铁锰硅基合金 SME 的有效方法。本研究调查了溶液处理铁锰硅基合金中掺杂痕量硼对 ATB 密度和由此产生的 SME 的影响。结果表明，掺杂 89 ppm B 有效降低了溶液处理铁锰硅基合金中的 ATB 密度。因此，其 SME 显著提高。掺入硼的合金的最大形状恢复应变达到 2.7%，比未掺入硼的合金高出 1.3%。这项研究为通过掺杂痕量硼来改善 SME 提供了一条新途径，这对于以更具成本效益的方式制造铁锰硅形状记忆合金具有重要意义。

引用次数: 0

Influence of ball milling on the evolution of microstructure and microtexture in hot-press sintered cobalt alloy 球磨对热压烧结钴合金微结构和微纹理演变的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-15 DOI: 10.1016/j.intermet.2024.108548

Vallapurapu Deva Praneeth , Manikandan R. , Pranav A.S. , Annamalai A. Raja , Muthuchamy A.

The present study examined the influence of ball milling on the evolution of microstructure, texture, and grain boundary distribution in hot press sintered cobalt-based alloy (60Co-15Al-15Ti-5Ta-5Nb). The key findings of this study reveal that the sample that underwent a 20-h ball milling followed by sintering has a high hardness of 1068 HV0.5, a relative sintered density of 85.65 %, and a high strength of 592 MPa. Additionally, it demonstrates that the use of ball milling for more than 20 h decreases the densification, thereby affected their mechanical properties.

本研究探讨了球磨对热压烧结钴基合金（60Co-15Al-15Ti-5Ta-5Nb）微观结构、纹理和晶界分布演变的影响。该研究的主要发现表明，经过 20 小时球磨后烧结的样品硬度高达 1068 HV0.5，相对烧结密度为 85.65 %，强度高达 592 MPa。此外，它还表明，球磨时间超过 20 小时会降低致密化程度，从而影响其机械性能。

引用次数: 0

Corrosion and passivation behavior of Fe40Mn20Cr20Ni20 high-entropy alloys in artificial seawater: Effect of rare earth Ce 人工海水中 Fe40Mn20Cr20Ni20 高熵合金的腐蚀和钝化行为：稀土 Ce 的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-14 DOI: 10.1016/j.intermet.2024.108554

Di Wang , Aidong Lan , Huijun Yang , Xi Jin , Junwei Qiao

The pitting and passivation film properties of Ce-modified Fe₄₀Mn₂₀Cr₂₀Ni₂₀ high-entropy alloys in artificial seawater were investigated. Corrosion morphology and kinetic potential polarization curves indicated that the doping of Ce changed the compositions of the alloy inclusions, increased the pitting potentials and reduced the alloy's sensitivity to pitting. The reduction of the defect density and the diffusion coefficient of pitting defects (

D_{0}

) within the passivate film proved the effectiveness of Ce in enhancing the protective property of the passivate film, with Ce-0.10 being the most prominent.

研究了人工海水中 Ce 改性 Fe40Mn20Cr20Ni20 高熵合金的点蚀和钝化膜性能。腐蚀形态和动力学电位极化曲线表明，掺入 Ce 改变了合金夹杂物的成分，提高了点蚀电位，降低了合金对点蚀的敏感性。钝化膜内缺陷密度和点蚀缺陷扩散系数（D0）的降低证明了 Ce 在增强钝化膜保护性能方面的有效性，其中以 Ce-0.10 的效果最为显著。

引用次数: 0

Microstructure, mechanical properties and oxidation resistance of β-solidifying γ-TiAl based alloys β-凝固γ-TiAl基合金的微观结构、力学性能和抗氧化性

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-13 DOI: 10.1016/j.intermet.2024.108556

V.M. Imayev, D.M. Trofimov, R.M. Imayev

In the present work, two β-solidifying γ-TiAl based intermetallic alloys, Ti-43.5Al-4Nb-1Mo-0.1B (TNM) and Ti-43.5Al-6(Nb,Zr,Hf)-0.1B (TNZ) (at.%), have been comparatively studied. Two microstructural conditions per alloy, near duplex and near lamellar, were obtained in the alloys by isothermal upset forging and two-stage heat treatments. Microstructure examination revealed three phases (γ, α₂ and β(β_o)) in both alloys but in the TNZ alloy the β(β_o) phase content was less than 1 vol% in contrast to the TNM alloy, in which the β(β_o) phase content was varied within 4–8 vol%. The near duplex conditions of the alloys were similar, whereas a coarser microstructure was obtained in the TNZ alloy with near lamellar structure. The tensile and creep tests revealed that the brittle-ductile transition in the TNZ alloy occurred at higher temperatures that correlated with an appreciably higher creep resistance of the TNZ alloy as compared to the TNM alloy. In the near lamellar condition, the TNZ alloy showed superior strength at 900–1000 °C as compared to known γ-TiAl alloys (e.g. UTS = 554 MPa at 950 °C). The oxidation resistance of the alloys in the near lamellar conditions was evaluated during exposure at 800 °C for 1000 h. The TNZ alloy showed higher oxidation resistance and thus generally appreciably higher high-temperature capability than the TNM alloy. It has been shown that the fundamental reason for different temperatures of the brittle-ductile transition and different creep and oxidation resistance of the alloys is the enhanced thermal stability of the microstructure of the TNZ alloy compared to the TNM alloy.

在本研究中，比较研究了两种β凝固γ-TiAl 金属间合金：Ti-43.5Al-4Nb-1Mo-0.1B (TNM) 和 Ti-43.5Al-6(Nb,Zr,Hf)-0.1B (TNZ) (at.%)。通过等温镦锻和两阶段热处理，每种合金获得了近双相和近薄片两种微观结构状态。显微组织检查发现，两种合金中都存在三相（γ、α2 和 β(βo)），但 TNZ 合金中的β(βo)相含量低于 1 Vol%，而 TNM 合金中的β(βo)相含量变化范围在 4-8 Vol%之间。两种合金的近双相条件相似，而 TNZ 合金的微观结构更为粗糙，接近片状结构。拉伸和蠕变试验表明，TNZ 合金的脆-韧性转变发生在较高的温度下，与 TNM 合金相比，TNZ 合金的抗蠕变性明显更高。与已知的γ-TiAl合金相比，TNZ合金在900-1000 °C的近层状条件下显示出更高的强度（例如，950 °C时的UTS = 554 MPa）。在 800 °C、1000 小时的暴露过程中，对合金在近层状条件下的抗氧化性进行了评估。TNZ 合金显示出更高的抗氧化性，因此其高温性能明显高于 TNM 合金。结果表明，合金的脆-韧性转变温度不同以及抗蠕变性和抗氧化性不同的根本原因在于 TNZ 合金的微观结构的热稳定性比 TNM 合金更强。

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引用次数: 0

Asynchronous deformation behavior of precipitation-hardened high-entropy alloys shaped charge liner under explosive loading 爆炸加载下沉淀硬化高熵合金成型装药衬垫的异步变形行为

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-12 DOI: 10.1016/j.intermet.2024.108555

Xutao Wang , Benpeng Wang , Xudong Liu , Tianxiang Li , Hanlin Zeng , Liang Wang , Ke Jin , Yunfei Xue

Precipitation-hardened high entropy alloys (PHEAs) are promising candidates for shaped charge liners (SCLs) due to their potential in obtaining good penetration depth and diameter. Deformation mechanism under explosive is the key to guiding the alloys microstructure, property optimization and shaped charge designing. In this study, the microstructural evolution and deformation mechanism of PHEA SCLs under explosive loading were systematically investigated. Under explosive loading, both the α₂ and BCC matrix phases underwent dynamic recrystallization, transforming into fine equiaxed grains (∼10 μm). The BCC phase deformed earlier than the α₂ phase, exhibiting a clearly asynchronous deformation behavior. This demonstrates that the α₂ phase can effectively improve the deformation resistance upon detonation and further increase jet diameter. Moreover, the α₂ can be retained under explosive conditions, which enables delaying the expansion of the adiabatic shear bands and further improving the jet continuity. Our results shed lights on developing new high-performance alloys and the related microstructure optimization for engineering applications in SCLs.

沉淀硬化高熵合金（PHEAs）具有获得良好穿透深度和直径的潜力，因此有望成为异型装药衬里（SCLs）的候选材料。爆炸下的变形机制是指导合金微观结构、性能优化和异型装药设计的关键。本研究系统研究了爆炸加载下 PHEA SCL 的微观结构演变和变形机理。在爆炸加载下，α2 和 BCC 基体相均发生了动态再结晶，转变为细小的等轴晶粒（∼10 μm）。BCC 相的变形早于 α2 相，表现出明显的异步变形行为。这表明，α2 相能有效改善引爆时的抗变形能力，并进一步增大射流直径。此外，α2 相还能在爆炸条件下保留下来，从而延迟绝热剪切带的扩展，进一步改善射流的连续性。我们的研究结果为开发新的高性能合金及相关微结构优化提供了启示，可用于 SCL 的工程应用。

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引用次数: 0

Tailoring the magnetic properties of Ce-Fe-B alloys by controlling the CeFe2 paramagnetic phase 通过控制 CeFe2 顺磁相定制 Ce-Fe-B 合金的磁性能

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-12 DOI: 10.1016/j.intermet.2024.108571

Yongqiang Deng , Sajjad Ur Rehman , Zhihao Liu , Haihua Liu , Shuwei Zhong , Xiaoqiang Yu , Jiajie Li , Munan Yang

The CeFe₂ paramagnetic phase consumes a large amount of Ce in the Ce-Fe-B, deteriorating the magnetic properties of the alloys. Due to the significant consumption of Ce element in the CeFe₂ phase, the content of Ce is maintained at a high level, i.e., up to 35–37 wt% in the Ce-Fe-B alloys. In this paper, we report the magnetic properties of Ce-Fe-B alloys by adding Ge, which suppresses the formation of the CeFe₂ phase. The content of Ce is reduced from 35 to 28.5 wt%, resulting in a significant reduction in the volume fraction of the CeFe₂ from 10.3 wt% in the Ce₃₅Fe_63.5Ge_0.5B alloy to 1.6 wt% in the Ce_31.1Fe_67.4Ge_0.5B alloy. The soft magnetic α-Fe phase is formed when the content of Ce is reduced to 29.8 and 28.5 wt%. The intrinsic coercivity of the alloys decreased from 490 kA/m in the pristine alloy to 410 kA/m in the Ce_29.8Fe_68.7Ge_0.5B alloy. The remanence of the alloys increased from 0.46 T in the pristine alloy to 0.59 T in the Ce_29.8Fe_68.7Ge_0.5B alloy. More strikingly, the maximum energy density, which is the figure of merit for permanent magnets, increased from 33.8 kJ/m³ to 52.3 kJ/m³, showing an increment of ∼55 %. The phase constituents, microstructure, phase transition temperatures, magnetic interactions, and applicability of the alloys have been investigated in detail using XRD Rietveld refinement, transmission electron microscopy and various magnetic property measurements.

CeFe2 顺磁性相消耗了 Ce-Fe-B 中大量的 Ce 元素，从而降低了合金的磁性能。由于 CeFe2 相消耗了大量的 Ce 元素，Ce-Fe-B 合金中的 Ce 含量保持在较高水平，即高达 35-37 wt%。本文报告了通过添加 Ge 来抑制 CeFe2 相形成的 Ce-Fe-B 合金的磁性能。Ce 的含量从 35% 降至 28.5%，导致 CeFe2 的体积分数从 Ce35Fe63.5Ge0.5B 合金中的 10.3% 显著降至 Ce31.1Fe67.4Ge0.5B 合金中的 1.6%。当 Ce 的含量降低到 29.8 和 28.5 wt% 时，就会形成软磁 α-Fe 相。合金的本征矫顽力从原始合金的 490 kA/m 降至 Ce29.8Fe68.7Ge0.5B 合金的 410 kA/m。合金的剩磁从原始合金的 0.46 T 增加到 Ce29.8Fe68.7Ge0.5B 合金的 0.59 T。更引人注目的是，最大能量密度（即永磁体的优点）从 33.8 kJ/m3 增加到 52.3 kJ/m3，增幅达 55%。利用 XRD Rietveld 精炼、透射电子显微镜和各种磁性能测量，对合金的相组成、微观结构、相变温度、磁相互作用和适用性进行了详细研究。

{"title":"Tailoring the magnetic properties of Ce-Fe-B alloys by controlling the CeFe2 paramagnetic phase","authors":"Yongqiang Deng , Sajjad Ur Rehman , Zhihao Liu , Haihua Liu , Shuwei Zhong , Xiaoqiang Yu , Jiajie Li , Munan Yang","doi":"10.1016/j.intermet.2024.108571","DOIUrl":"10.1016/j.intermet.2024.108571","url":null,"abstract":"<div><div>The CeFe<sub>2</sub> paramagnetic phase consumes a large amount of Ce in the Ce-Fe-B, deteriorating the magnetic properties of the alloys. Due to the significant consumption of Ce element in the CeFe<sub>2</sub> phase, the content of Ce is maintained at a high level, i.e., up to 35–37 wt% in the Ce-Fe-B alloys. In this paper, we report the magnetic properties of Ce-Fe-B alloys by adding Ge, which suppresses the formation of the CeFe<sub>2</sub> phase. The content of Ce is reduced from 35 to 28.5 wt%, resulting in a significant reduction in the volume fraction of the CeFe<sub>2</sub> from 10.3 wt% in the Ce<sub>35</sub>Fe<sub>63.5</sub>Ge<sub>0.5</sub>B alloy to 1.6 wt% in the Ce<sub>31.1</sub>Fe<sub>67.4</sub>Ge<sub>0.5</sub>B alloy. The soft magnetic α-Fe phase is formed when the content of Ce is reduced to 29.8 and 28.5 wt%. The intrinsic coercivity of the alloys decreased from 490 kA/m in the pristine alloy to 410 kA/m in the Ce<sub>29.8</sub>Fe<sub>68.7</sub>Ge<sub>0.5</sub>B alloy. The remanence of the alloys increased from 0.46 T in the pristine alloy to 0.59 T in the Ce<sub>29.8</sub>Fe<sub>68.7</sub>Ge<sub>0.5</sub>B alloy. More strikingly, the maximum energy density, which is the figure of merit for permanent magnets, increased from 33.8 kJ/m<sup>3</sup> to 52.3 kJ/m<sup>3</sup>, showing an increment of ∼55 %. The phase constituents, microstructure, phase transition temperatures, magnetic interactions, and applicability of the alloys have been investigated in detail using XRD Rietveld refinement, transmission electron microscopy and various magnetic property measurements.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108571"},"PeriodicalIF":4.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660103","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

Influences of element M (M=Mo, Cu, and Al) on CoCrFeNiTi-based high entropy alloys by laser cladding under different process parameters 不同工艺参数下激光熔覆元素 M（M=钼、铜和铝）对 CoCrFeNiTi 基高熵合金的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-11 DOI: 10.1016/j.intermet.2024.108572

Guofu Lian , Jiangbin Chen , Jianghuai Yang , Meiyan Feng , Song Lan

Excellent alloys were prepared to explore the effects of different additions of element M on CoCrFeNiTi-based high entropy alloys by laser cladding under different process parameters. The preset-powder method was used to prepare CoCrFeNiTi_0.5M_0.5 (M = Mo, Cu, and Al) coating in the work. The material properties of high entropy alloys were calculated based on the first principle. After that, the influence mechanism of the addition of M on the CoCrFeNiTi-based high entropy alloy was explored by experiments. The phasing standards of coatings added with M were calculated according to the first principle. It was predicted that CoCrFeNiTi_0.5Mo_0.5 coating and CoCrFeNiTi_0.5Cu_0.5 coating had high hardness and toughness, respectively. All six high-entropy alloys were stable in mechanics. The optimal process parameter coating was selected by the all-factor test based on excellent hardness and shaping quality. The results were consistent with those by theoretical calculations. The cocktail effect of high-entropy alloys was explored by analyzing the effect of different elemental additions on the overall performance of coatings. Results showed that the CoCrFeNiTi_0.5Mo_0.5 coating had high wear resistance and local elastic modulus. The friction mass loss and local elastic modulus were 0.0410 mm³ and 279.0444 GPa, respectively. The CoCrFeNiTi_0.5Cu_0.5 coating had high toughness and corrosion resistance. The resilience and free corrosion potential were 81.6473 nm and −0.730 V, respectively. The CoCrFeNiTi_0.5Al_0.5 coating had good crack resistance. Plastic storage energy was 30071.5097 × 10⁻¹⁵ J. Research results provided a theoretical basis for preparing high entropy alloy reinforced coatings by laser cladding.

为了探索在不同工艺参数下通过激光熔覆不同添加量的元素 M 对 CoCrFeNiTi 基高熵合金的影响，我们制备了优异的合金。工作中采用预设粉末法制备 CoCrFeNiTi_0.5M_0.5（M = Mo、Cu 和 Al）涂层。根据第一原理计算了高熵合金的材料特性。随后，通过实验探讨了添加 M 对 CoCrFeNiTi 基高熵合金的影响机理。根据第一性原理计算了添加了 M 的涂层的相位标准。据预测，CoCrFeNiTi_0.5Mo_0.5 涂层和 CoCrFeNiTi_0.5Cu_0.5 涂层分别具有较高的硬度和韧性。六种高熵合金的力学性能都很稳定。通过全因素试验，选出了硬度和塑形质量均优异的最佳工艺参数涂层。结果与理论计算结果一致。通过分析不同元素添加量对涂层整体性能的影响，探讨了高熵合金的鸡尾酒效应。结果表明，CoCrFeNiTi_0.5Mo_0.5 涂层具有较高的耐磨性和局部弹性模量。摩擦质量损失和局部弹性模量分别为 0.0410 mm3 和 279.0444 GPa。CoCrFeNiTi_0.5Cu_0.5 涂层具有高韧性和耐腐蚀性。韧性和自由腐蚀电位分别为 81.6473 nm 和 -0.730 V。CoCrFeNiTi_0.5Al_0.5 涂层具有良好的抗裂性。研究结果为通过激光熔覆制备高熵合金强化涂层提供了理论依据。

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引用次数: 0

The disorder-order transition of FeCuPt nanoparticles with various Cu content 不同铜含量的铁铜铂纳米粒子的无序阶跃转变

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-09 DOI: 10.1016/j.intermet.2024.108561

Chun Wu , Qunshou Wang , Zhiyong Li , Ling Chang , Kai Wang , Wenli Pei , Qiang Wang

The effect of adding a third-element on disorder-order transition of FePt has been demonstrated using FeCuPt alloy as a model. The introduction of Cu leads to an increase in the ordering degree, and a moderate amount of Cu enhancing the most. Density Functional Theory calculations indicate that the disorder-order transition in FePt is influenced by the ordering temperature and vacancy formation energy. FePtCu alloy with a moderate Cu content exhibits the lowest vacancy formation energy in the L1₀-phase, which promotes the atom diffusion during annealing and resulting in a higher ordering degree. This study summarizes the annealing temperature, time, and thermodynamic or kinetic conditions required to achieve L1₀-FePtX alloy with superior ordering degrees. The findings offer valuable insights for selecting suitable third-elements and annealing parameters to produce L1₀-FePtX alloy with enhanced ordering degrees.

以 FeCuPt 合金为模型，证明了添加第三元素对 FePt 无序有序转变的影响。铜的引入会导致有序度的增加，而适量的铜对有序度的影响最大。密度泛函理论计算表明，FePt 的无序-有序转变受有序温度和空位形成能的影响。适量铜含量的 FePtCu 合金在 L10 相表现出最低的空位形成能，这促进了退火过程中的原子扩散，从而导致更高的有序度。本研究总结了获得具有较高有序度的 L10-FePtX 合金所需的退火温度、时间、热力学或动力学条件。研究结果为选择合适的第三元素和退火参数以生产具有更高有序度的 L10-FePtX 合金提供了有价值的见解。

引用次数: 0

SnPbInBiSb high-entropy solder joints with inhibited interfacial IMC growth and high shear strength 具有抑制界面 IMC 生长和高剪切强度的 SnPbInBiSb 高熵焊点

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-11-09 DOI: 10.1016/j.intermet.2024.108551

Shuai Wang , Ruyu Tian , Jiayue Wen , Wei Wang , Jiayun Feng , Shang Wang , Yanhong Tian

The rapid advancements in microelectronic devices towards miniaturization and multifunctionality have led to an increasing demand for solder joints that exhibit enhanced mechanical properties and reliability. This study focuses on investigating the high-shear strength of SnPbInBiSb/Cu high-entropy solder joints. The analysis encompasses the microstructure evolution, interfacial reactions, and shear behavior of these solder joints after reflowing at 180 °C. The study reveals the formation of very thin intermetallic compound (IMC) layers, specifically Cu₆Sn₅ and Cu₃Sn, at the SnPbInBiSb/Cu interface with an average thickness of about 1.04 μm following a 10min reflow. Transmission electron microscopy (TEM) analysis illustrates the presence of nanoscale precipitates of InSn₃ or Sn₃Sb phases dispersed within the Cu₆Sn₅ IMC. The high mixing entropy of the SnPbInBiSb solder contributes to the suppression of the interfacial IMC growth rate during the reflow process. Notably, the shear strength and fracture behavior of the SnPbInBiSb high-entropy solder joints are significantly influenced by the thickness of the interfacial IMC. In particular, solder joints reflowed at 180 °C for 10 min exhibit a high shear strength of 102.4 MPa with a ductile fracture mode.

随着微电子器件向微型化和多功能化的快速发展，对具有更强机械性能和可靠性的焊点的需求也在不断增加。本研究的重点是研究 SnPbInBiSb/Cu 高熵焊点的高剪切强度。分析包括这些焊点在 180 °C 回流后的微观结构演变、界面反应和剪切行为。研究结果表明，回流 10 分钟后，在 SnPbInBiSb/Cu 接口上形成了非常薄的金属间化合物 (IMC) 层，特别是 Cu6Sn5 和 Cu3Sn，平均厚度约为 1.04 μm。透射电子显微镜（TEM）分析表明，在 Cu6Sn5 IMC 中分散着 InSn3 或 Sn3Sb 相的纳米级沉淀。SnPbInBiSb 焊料的高混合熵有助于抑制回流过程中的界面 IMC 增长率。值得注意的是，SnPbInBiSb 高熵焊点的剪切强度和断裂行为受到界面 IMC 厚度的显著影响。特别是，在 180 °C 下回流 10 分钟的焊点具有 102.4 兆帕的高剪切强度和韧性断裂模式。

{"title":"SnPbInBiSb high-entropy solder joints with inhibited interfacial IMC growth and high shear strength","authors":"Shuai Wang , Ruyu Tian , Jiayue Wen , Wei Wang , Jiayun Feng , Shang Wang , Yanhong Tian","doi":"10.1016/j.intermet.2024.108551","DOIUrl":"10.1016/j.intermet.2024.108551","url":null,"abstract":"<div><div>The rapid advancements in microelectronic devices towards miniaturization and multifunctionality have led to an increasing demand for solder joints that exhibit enhanced mechanical properties and reliability. This study focuses on investigating the high-shear strength of SnPbInBiSb/Cu high-entropy solder joints. The analysis encompasses the microstructure evolution, interfacial reactions, and shear behavior of these solder joints after reflowing at 180 °C. The study reveals the formation of very thin intermetallic compound (IMC) layers, specifically Cu<sub>6</sub>Sn<sub>5</sub> and Cu<sub>3</sub>Sn, at the SnPbInBiSb/Cu interface with an average thickness of about 1.04 μm following a 10min reflow. Transmission electron microscopy (TEM) analysis illustrates the presence of nanoscale precipitates of InSn<sub>3</sub> or Sn<sub>3</sub>Sb phases dispersed within the Cu<sub>6</sub>Sn<sub>5</sub> IMC. The high mixing entropy of the SnPbInBiSb solder contributes to the suppression of the interfacial IMC growth rate during the reflow process. Notably, the shear strength and fracture behavior of the SnPbInBiSb high-entropy solder joints are significantly influenced by the thickness of the interfacial IMC. In particular, solder joints reflowed at 180 °C for 10 min exhibit a high shear strength of 102.4 MPa with a ductile fracture mode.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108551"},"PeriodicalIF":4.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660108","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}

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