Materials Science and Engineering: A最新文献_第10页

The effect of Y2O3 particles on the microstructure and mechanical properties of tungsten fiber-reinforced tungsten composites Y2O3 粒子对钨纤维增强钨复合材料微观结构和力学性能的影响

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147449

Y. Chen , C. Chen , J.H. Chen , K.L. Li , S. Wang , Y.F. Zhang , H.Y. Chen , T.H. Beri , J. Wang , L.M. Luo , Y.C. Wu

Tungsten fiber-reinforced tungsten (W_f/W) composites are a promising plasma-facing material, and the microstructure at the interface between W fibers and the W matrix greatly impacts performance. In this study, a new kind of W_f/W-Y₂O₃ composites was developed with the addition of Y₂O₃ particles to the W matrix in order to modify the interface microstructure between W fibers and the matrix. The microstructure and mechanical properties of these composites were investigated through sintering at temperatures ranging from 1500 °C to 1800 °C. The Y₂O₃ particles with a face-centered cubic crystal structure were formed at the interface between W fibers and the matrix, which is beneficial for weakening the bonding strength. The W_f/W-Y₂O₃ composites exhibited pseudo-plasticity at low sintering temperatures, which show the highest bending strength (261 MPa) and fracture energy (6.66 kJ/m²) at 1600 °C. The grains in W particles become the recrystallized nuclei on the surface of W fiber through the bonding of W powder and W fibers. Then, these recrystallized nuclei grow into W fibers by migration of bonding boundaries. However, the Y₂O₃ particles in the W powder can inhibit the migration of grain boundaries, thereby suppressing the abnormal grain growth behavior at the surface of W fiber.

钨纤维增强钨（Wf/W）复合材料是一种前景广阔的等离子体面层材料，而钨纤维与钨基体之间界面的微观结构对性能有很大影响。本研究开发了一种新型 Wf/W-Y2O3 复合材料，在 W 基体中加入 Y2O3 颗粒，以改变 W 纤维与基体之间的界面微结构。通过在 1500 °C 至 1800 °C 温度范围内进行烧结，研究了这些复合材料的微观结构和机械性能。在 W 纤维和基体之间的界面上形成了具有面心立方晶体结构的 Y2O3 颗粒，这有利于削弱结合强度。Wf/W-Y2O3 复合材料在低烧结温度下表现出假塑性，在 1600 °C 时弯曲强度（261 MPa）和断裂能（6.66 kJ/m2）最高。W 颗粒中的晶粒通过 W 粉末和 W 纤维的结合成为 W 纤维表面的再结晶核。然后，这些再结晶核通过键合边界的迁移长成 W 纤维。然而，W 粉末中的 Y2O3 颗粒可以抑制晶界迁移，从而抑制 W 纤维表面的异常晶粒生长行为。

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引用次数: 0

Improvement of gradient microstructure and properties of wire-arc directed energy deposition titanium alloy via laser shock peening 通过激光冲击强化改善线弧定向能沉积钛合金的梯度微观结构和性能

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147422

Guanda Qu , Wei Guo , Jiaxin Shi , Dongsheng He , Yongxin Zhang , Yihao Dong , Jiaxuan Chi , Zhikang Shen , Ying Li , Zhenlin Chen , Hongqiang Zhang

Wire-arc directed energy deposition (WADED) technology has been widely used in the remanufacturing of titanium alloy structural components benefited from with the advantages such as high deposition efficiency and low cost. However, due to the coarse and anisotropic microstructure, the complex internal stresses and processing-induced rough surface significantly reduce fatigue performance and reliability of the remanufactured structural components. In this work, surface modification of titanium alloy WADED repair component was carried out via laser shock peening (LSP), and its gradient structure, microhardness, residual stress and fatigue performance and enhancement mechanism were systematically investigated. Results indicated that the different microstructure of each region led to different responses under the action of LSP, which was related to the change of dislocation density. LSP induced crystal defects such as high-density dislocations, twins and stacking faults on the surface. A variety of crystal defects gradually decreased with the depth from the strengthened surface, formed a gradient microstructure and significantly affected the microhardness and residual stress of the repaired components. The surface hardness and compressive residual stress of the repaired components were greatly increased after LSP and the hardened layer and compressive residual stress depth affected layer were 600 μm and 800 μm, respectively. The average fatigue life of the additive repair component increased by 197 % under the synergistic effect of compressive residual stress and gradient microstructure.

线弧定向能沉积（WADED）技术具有沉积效率高、成本低等优点，已被广泛应用于钛合金结构部件的再制造。然而，由于钛合金微观结构粗糙且各向异性，复杂的内应力和加工引起的粗糙表面大大降低了再制造结构部件的疲劳性能和可靠性。在这项工作中，通过激光冲击强化（LSP）对钛合金 WADED 修复部件进行了表面改性，并系统地研究了其梯度结构、显微硬度、残余应力和疲劳性能及增强机制。结果表明，在 LSP 作用下，每个区域的不同微观结构会导致不同的反应，这与位错密度的变化有关。LSP 在表面诱发了高密度位错、孪晶和堆积断层等晶体缺陷。各种晶体缺陷随强化表面深度的增加而逐渐减少，形成梯度微观结构，并对修复后部件的显微硬度和残余应力产生显著影响。LSP 后，修复部件的表面硬度和压缩残余应力均大幅提高，硬化层和压缩残余应力影响层深度分别为 600 μm 和 800 μm。在压缩残余应力和梯度微结构的协同作用下，添加剂修复组件的平均疲劳寿命提高了 197%。

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引用次数: 0

Effect of cryogenic and room-temperature rolling on the microstructural evolution and mechanical behavior of spray-formed 7055 Al-Zn-Mg-Cu alloy 低温轧制和室温轧制对喷射成形 7055 Al-Zn-Mg-Cu 合金微观结构演变和力学行为的影响

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147453

Tian Zhou , Yangwei Wang , Jiawei Bao , Muhammad Abubaker Khan , Rui An , Hao Zhang , Pingluo Zhao , Mohamed A. Afifi

This study investigates the effects of room-temperature rolling (RTR) and cryogenic rolling (CR) on the microstructure, mechanical properties, and fracture morphology of spray-formed (SF) 7055 Al-Zn-Mg-Cu alloy, with a focus on the deformation across reductions ranging from 20 % to 80 %. Utilizing SF as the base processing technique, the study aims to overcome challenges associated with the alloy's high content during conventional casting, such as segregation, grain coarsening, and the formation of internal defects. The findings indicate that CR significantly enhances the ductility and refines the microstructure of SF-7055 Al alloy compared to RTR, particularly at higher reductions. CR prevents the formation of severe cracks and maintains higher ductility and texture intensity, which are crucial for the demanding applications of this alloy in aerospace and transportation sectors. Microstructural analysis reveals that CR achieves a more uniform deformation, effectively reduces shear band formation, and facilitates the formation of finer and more evenly distributed precipitates due to suppressed solute atom mobility at cryogenic temperatures. Mechanical testing shows that CR enhances strength and hardness at lower reductions by maintaining high dislocation density, which does not annihilate as rapidly as in RTR. Tensile fracture analysis further demonstrates that CR leads to smoother fracture surfaces and fewer macroscopic cracks, indicating a more controlled failure mechanism. This study underscores the potential of cryogenic processing in improving the performance and applicability of high-strength Al alloys, offering significant insights for industrial applications where material reliability and enhanced mechanical properties are critical.

本研究调查了室温轧制（RTR）和低温轧制（CR）对喷射成形（SF）7055 Al-Zn-Mg-Cu 合金的微观结构、机械性能和断口形貌的影响，重点是 20% 至 80% 的减薄变形。利用 SF 作为基础加工技术，该研究旨在克服在传统铸造过程中与合金高含量相关的难题，如偏析、晶粒粗化和内部缺陷的形成。研究结果表明，与 RTR 相比，CR 能显著提高 SF-7055 Al 合金的延展性并细化其微观结构，尤其是在较高的还原度下。CR 可以防止形成严重裂纹，并保持较高的延展性和纹理强度，这对于这种合金在航空航天和运输领域的高要求应用至关重要。微观结构分析表明，CR 可实现更均匀的变形，有效减少剪切带的形成，并且由于低温下溶质原子的流动性受到抑制，有利于形成更细小、分布更均匀的沉淀物。机械测试表明，CR 能保持较高的位错密度，不像 RTR 那样迅速湮灭，从而在较低的还原度下提高强度和硬度。拉伸断裂分析进一步表明，CR 使断裂面更光滑，宏观裂纹更少，表明其失效机制更可控。这项研究强调了低温加工在提高高强度铝合金性能和适用性方面的潜力，为材料可靠性和增强机械性能至关重要的工业应用提供了重要启示。

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引用次数: 0

Achieving a remarkable strength–ductility combination in a novel casting AlCoCrNi high entropy alloy 在新型铸造铝钴铬镍高熵合金中实现出色的强度-电导率组合

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147436

Ning Xu , Yubo Huang , Xuming Liu , Dongpo Xuan , Huaile Lu , Shilei Li , Yan-dong Wang , Junsheng Wang

We prepared a novel cast high-entropy alloy (HEA) that comprises a dual-phase microstructure with L1₂ and B2 phases. Our designed HEA achieved a remarkable strength–ductility balance (tensile strength of ∼1025 MPa and uniform elongation of ∼30 %, which well outperforms many as-cast HEAs including arc-melting and directly cast HEAs.

我们制备了一种新型铸造高熵合金（HEA），它由 L12 和 B2 两相组成的双相微结构。我们设计的高熵合金实现了显著的强度-韧性平衡（抗拉强度达 1025 兆帕，均匀伸长率达 30%，远远优于电弧熔化和直接铸造的高熵合金）。

引用次数: 0

Metastability-driven room temperature strain hardening in a nitrogen added FeMnCoCrN high-entropy alloy 添加氮的铁锰钴铬镍高熵合金的铸造性驱动室温应变硬化

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147443

A. Tajik , A. Zarei-Hanzaki , Gunjick Lee , Seok Su Sohn , H.R. Abedi

This study deals with the strain hardening capability of a nitrogen added FeMnCoCr high-entropy alloy during room temperature tensile deformation with an emphasize on the mechanical stability of FCC phase. The heightened metastability of the FCC phase provides a proper condition for hierarchical evolution of dual-phase FCC-HCP structure which finally promotes the formation of 63 % HCP martensite. Initially favoring slip mechanisms, the texture of the FCC phase transitions to geometrically hard orientations, thereby reducing its deformation accommodation capacity. This transition prompts the involvement of the HCP phase, initially evidenced by the emergence of new FCC phase and ε-twins at HCP martensite intersections. Subsequently, the formation of thickened ε-twins within the primary HCP lathes further contributes to deformation accommodation, explaining the observed excellent hardening behavior in the as-cast structure.

本研究探讨了添加氮的铁锰钴铬高熵合金在室温拉伸变形过程中的应变硬化能力，重点关注 FCC 相的机械稳定性。FCC 相的高转移性为 FCC-HCP 双相结构的分层演变提供了适当的条件，最终促进了 63% HCP 马氏体的形成。FCC 相的纹理最初倾向于滑移机制，后来过渡到几何硬取向，从而降低了其变形容纳能力。这种转变促使 HCP 相的参与，最初表现为在 HCP 马氏体相交处出现新的 FCC 相和ε-孪晶。随后，原生 HCP 车床内增厚的 ε-孪晶的形成进一步促进了变形容纳能力，从而解释了在铸造结构中观察到的优异硬化行为。

引用次数: 0

Interfacial microstructure and synergistic enhancement mechanism of symmetric gradient SiCp-reinforced aluminum matrix sandwich structure 对称梯度 SiCp 增强铝基夹层结构的界面微结构和协同增强机制

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147452

Ying Guo , Wen-quan Li , Xin-gang Liu , Kai-yao Wang , Chao Zhang

Inspired by the biological sandwich structure to achieve excellent mechanical properties with both high strength and high ductility, the symmetric gradient silicon carbide particles (SiCp) reinforced aluminum (Al) composites, consisting of 10 % SiCp/Al-3% SiCp/Al-Al-3% SiCp/Al-10 % SiCp/Al, was fabricated using spark plasma sintering technology. The flat interface was achieved through hot rolling, significantly improving the bonding of interlayers. The differences in SiCp content among layers led to distinct evolution patterns in microstructure. In the pure Al layer, a notable continuous recrystallization mechanism was observed, while in the 3 % SiCp/Al and 10 % SiCp/Al layers, the recrystallization mechanism was nucleation-growth. The transmission electron microscope results indicated that the hindrance of dislocation motion at the interlayer interface and SiCp-Al interface enhanced the dislocation density, thereby improving its plastic deformation capability. On the other hand, the deflection and passivation of cracks at the interlayer interface significantly improves toughness. The differences intragranular strain among layers were most pronounced at the interlayer interfaces, leading to them becoming the stress concentration zone. Uncoordinated plastic deformation leads to sequential failure of layers, vertical cracks first occurred in the 10 % SiCp/Al layer, then propagated towards the interlayer interface and the 3 % SiCp/Al layer, respectively.

受生物夹层结构可获得高强度和高延展性等优异机械性能的启发，利用火花等离子烧结技术制造了对称梯度碳化硅颗粒（SiCp）增强铝（Al）复合材料，包括 10 % SiCp/Al-3 % SiCp/Al-Al-3 % SiCp/Al-10 % SiCp/Al。通过热轧实现了平整的界面，大大提高了夹层的结合力。各层之间 SiCp 含量的差异导致了微观结构的不同演变模式。在纯铝层中，观察到明显的连续再结晶机制，而在 3 % SiCp/Al 和 10 % SiCp/Al 层中，再结晶机制为成核-生长。透射电子显微镜结果表明，层间界面和 SiCp-Al 界面的位错运动阻碍增强了位错密度，从而提高了其塑性变形能力。另一方面，层间界面上裂纹的偏转和钝化显著提高了韧性。层间晶内应变的差异在层间界面上最为明显，导致层间界面成为应力集中区。不协调的塑性变形导致各层相继失效，垂直裂纹首先出现在 10% SiCp/Al 层，然后分别向层间界面和 3% SiCp/Al 层扩展。

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引用次数: 0

Effect of hot-rolling process on the microstructure, mechanical and corrosion behaviors of dual-phase Co-based entropic alloys 热轧工艺对双相 Co 基熵合金微观结构、力学和腐蚀行为的影响

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147433

Wei Wang , Wenyu Zhao , Wangzhong Mu , Zhou Li , Zhankun Weng , Wenda Zhang , Nan Wang , Peikang Bai

Two compositions from dual-phase Co-based entropic alloys with high corrosion resistance were chosen, and the effect of hot-rolling process on the microstrcture, mechanical property and corrosion resistance was investigated in this work. The processing parameters were designed and optimized by CALPHAD calculations. For the case of hot-rolled alloys, fcc + hcp dual-phase structures were confirmed by different characterization techniques, including XRD, ECCI, and EBSD. After testing various mechanical properties and electrochemical corrosion behaviors at room temperature, the hot-rolled alloys exhibit an outstanding mechanical and corrosion resistance property. The hot-rolling process improves the electrochemical corrosion resistance slightly and promotes hardness as well as strength-ductility greatly. The experimental characterizations provide plentiful information about microstructure, crystallographic orientation, lattice misorientation, grain boundaries, and so on. More details for the strengthening and hardening mechanisms could be obtained from the EBSD analysis. The current work shed lights on the design of new alloy recipe as well as the synthesis of novel grade dual-phase entropic alloys with excellent combination of mechanical properties and corrosion resistance which could be applied in harsh environments.

本研究从具有高耐腐蚀性的双相 Co 基熵合金中选择了两种成分，研究了热轧工艺对微观组织、机械性能和耐腐蚀性能的影响。通过 CALPHAD 计算对加工参数进行了设计和优化。通过 XRD、ECCI 和 EBSD 等不同表征技术确认了热轧合金的 fcc + hcp 双相结构。在室温下测试了各种机械性能和电化学腐蚀行为后，热轧合金表现出了出色的机械性能和耐腐蚀性能。热轧工艺略微改善了耐电化学腐蚀性能，并大大提高了硬度和强度-电导率。实验表征提供了大量有关微观结构、结晶取向、晶格错位、晶界等方面的信息。从 EBSD 分析中可以获得更多有关强化和硬化机制的细节。目前的研究工作为设计新的合金配方以及合成新型双相熵合金提供了启示，这些合金具有优异的机械性能和耐腐蚀性能，可应用于恶劣的环境中。

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引用次数: 0

Microstructure evolution and fracture characteristics of GH4079 superalloy during high-temperature tensile process GH4079 超合金在高温拉伸过程中的微观结构演变和断裂特性

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147450

Tonggang Lu , Xingang Liu , Wenwen Zhang , Qiang Tian

An investigation of the thermal deformation characteristics and fracture mechanisms of the GH4079 superalloy was conducted through a series of hot tensile experiments conducted across a range of strain rates (from 0.01 s⁻¹ to 1 s⁻¹) and temperatures (from 970 °C to 1160 °C). The impact of MC carbides on the thermal deformation characteristics and dynamic recrystallization (DRX) of GH4079 superalloys, which are known for their challenging deformability, was analyzed to provide insights into enhancing the thermal workability of these formidable superalloys. The results suggest that DRX consistently preferentially occurs near MC carbides. The MC carbide plays a nucleation role in the particle-induced dynamic recrystallization mechanism, as determined via EBSD analysis. In addition, the primary grain boundary is the preferred nucleation site for DRX initiation. The promotion of DRX within the GH4079 alloy is considerably facilitated by the increased stored energy and nucleation site density resulting from the larger and more numerous carbides present at the grain boundaries. Moreover, the presence of carbides leads to uncoordinated deformation of the alloy during tensile deformation, which is also the induction factor of alloy cracking. With increasing strain rates and temperatures, the window of control over the hot deformation structure of the alloy diminishes. During the high-temperature deformation process of the GH4079 alloy, it is necessary to control the temperature within the range of approximately 1120 °C–1140 °C and the strain rate within the range of 0.1 s⁻¹ to 1 s⁻¹ to obtain a fine and uniform grain structure, delay material failure, and thus enhance the thermal processing performance of the material.

通过在一系列应变率（从 0.01 s-1 到 1 s-1）和温度（从 970 °C 到 1160 °C）范围内进行一系列热拉伸实验，对 GH4079 超合金的热变形特性和断裂机制进行了研究。分析了 MC 碳化物对 GH4079 超合金热变形特性和动态再结晶 (DRX) 的影响，为提高这些强力超合金的热加工性能提供了见解。结果表明，DRX 始终优先发生在 MC 碳化物附近。通过 EBSD 分析确定，MC 碳化物在颗粒诱导的动态再结晶机制中起着成核作用。此外，主晶界是引发 DRX 的首选成核点。由于晶界上的碳化物更大、更多，从而增加了储能和成核点密度，这在很大程度上促进了 GH4079 合金中 DRX 的产生。此外，碳化物的存在导致合金在拉伸变形过程中发生不协调变形，这也是合金开裂的诱发因素。随着应变率和温度的升高，合金热变形结构的控制窗口逐渐缩小。在 GH4079 合金的高温变形过程中，有必要将温度控制在大约 1120 ℃-1140 ℃ 的范围内，将应变率控制在 0.1 s-1 至 1 s-1 的范围内，以获得精细均匀的晶粒结构，延迟材料失效，从而提高材料的热加工性能。

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引用次数: 0

Exploring the effect of Cr and Mn on the intrinsic strength of the tensile properties of FeCoNi, FeCoNiMn, FeCoNiCr, and FeCoNiCrMn multi-principal element alloys using in-situ EBSD 利用原位 EBSD 探索铬和锰对铁钴镍合金、铁钴镍锰合金、铁钴镍铬合金和铁钴镍铬锰合金拉伸性能内在强度的影响

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147442

Xufeng Wang , Hongli Suo , Zili Zhang , Shangxiong Huangfu , Qiuliang Wang

As the composition elements in multi-principal element alloys increase, it can bring excellent mechanical properties. However, the strengthening mechanism of the additional element is still unclear. In this work, we establish a method based on the in-situ EBSD technology to explore the possible effect of additional elements on the intrinsic strength of tensile properties. We prepared four different multi-principal element alloys, including FeCoNi, FeCoNiMn, FeCoNiCr, and FeCoNiCrMn with similar initial status. We systematically investigated the evolution of the microstructure, dislocation density, twin boundary, grain size, and element distribution during the tensile process by in-situ EBSD and EDS. By carefully analyzing the results of four different multi-principal element alloys, the strength effects of the solid-solution hardening, grain-boundary hardening, twin boundary hardening, precipitate hardening, and dislocation hardening were peeled. The effect of the Cr and Mn element addition on the intrinsic strength can be explored. It is found that the element addition indeed increases the intrinsic strength from quaternary to quinary but not very clear from ternary to quaternary no matter Cr or Mn, which indicated that the intrinsic strength was more related to the number of elements in the alloy than to which element was present. This can be explained using the mixing entropy theory, which states that the intrinsic strength is enhanced when the mixing entropy is over a threshold between the MEA and HEA. This paper presents a method to study the individual factors affecting the tensile properties, which can help other researchers to better investigate HEA.

随着多主元素合金中组成元素的增加，它可以带来优异的机械性能。然而，附加元素的强化机理尚不清楚。在这项工作中，我们建立了一种基于原位 EBSD 技术的方法，以探索附加元素对拉伸性能内在强度的可能影响。我们制备了四种不同的多元素合金，包括初始状态相似的铁钴镍合金、铁钴镍锰合金、铁钴镍铬合金和铁钴镍铬锰合金。我们通过原位 EBSD 和 EDS 系统地研究了拉伸过程中微观结构、位错密度、孪晶边界、晶粒尺寸和元素分布的演变。通过仔细分析四种不同多主元素合金的结果，剥离了固溶硬化、晶界硬化、孪晶界硬化、沉淀硬化和位错硬化对强度的影响。探讨了铬和锰元素的添加对本征强度的影响。结果发现，添加元素确实会提高从四元到二元的本征强度，但从三元到四元的本征强度却不太明显，无论添加的是铬还是锰。这可以用混合熵理论来解释，即当混合熵超过 MEA 和 HEA 之间的临界值时，本征强度就会增强。本文提出了一种研究影响拉伸性能的个别因素的方法，有助于其他研究人员更好地研究 HEA。

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引用次数: 0

Laser microwelding of NiTi/PtIr alloys with laser beam offset 带激光束偏移的镍钛/铂铱合金激光微焊接

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147451

Tetsuya Oyamada, Kaiping Zhang, Y. Norman Zhou, Peng Peng

The NiTi and PtIr alloy joint has been employed in biomedical devices to combine the superelasticity of NiTi alloy with the X-ray visibility of PtIr alloy. Laser microwelding is usually used for the joints, but there is a risk of forming brittle intermetallic compounds (e.g., Ni₃Ti, Ti₂Ni, and Ti₃Pt) in the fusion zone (FZ), which could deteriorate joint strength. In this study, laser beam offset (laser offset) was implemented for a butt joint of Ni-49.8 at.% Ti and Pt-10.0 at.% Ir alloy wires to control the intermetallic compound formation in the FZ. Welding with 300 μm laser offset on the NiTi side achieved 2.3 times higher joint breaking stress and 13.0 times higher joint breaking strain than welding without laser offset. The joint breaking stress and strain were enhanced from 221 MPa and 0.9 % to 502 MPa and 11.7 % by 300 μm laser offset on the NiTi side, respectively. In the absence of laser offset, the dissolution of Pt and Ir into the FZ facilitated the M₃Ti (M = Ni, Pt, Ir) formation in the FZ, resulting in crack propagation within the M₃Ti. In contrast, the 300 μm offset on the NiTi side inhibited the M₃Ti formation by mitigating Pt and Ir dissolution into the FZ. Laser offset on the NiTi side can be an attractive option to enhance the strength and ductility of NiTi and PtIr butt joints.

镍钛和铂铱合金接头已被用于生物医学设备中，以结合镍钛合金的超弹性和铂铱合金的 X 射线可见性。接头通常采用激光微焊接，但存在在熔合区（FZ）形成脆性金属间化合物（如 Ni3Ti、Ti2Ni 和 Ti3Pt）的风险，这会降低接头强度。本研究对 Ni-49.8% Ti 和 Pt-10.0% Ir 合金焊丝的对接接头采用了激光束偏移（激光偏移）技术，以控制 FZ 中金属间化合物的形成。在镍钛侧使用 300 μm 激光偏移进行焊接时，接头断裂应力是未使用激光偏移焊接时的 2.3 倍，接头断裂应变是未使用激光偏移焊接时的 13.0 倍。在镍钛侧进行 300 μm 激光偏移焊接后，接头断裂应力和应变分别从 221 兆帕和 0.9% 提高到 502 兆帕和 11.7%。在没有激光偏移的情况下，铂和铁溶解到 FZ 中促进了 M3Ti（M = Ni、铂、铁）在 FZ 中的形成，导致裂纹在 M3Ti 中扩展。与此相反，镍钛侧 300 μm 的偏移可减轻铂和铁溶解到 FZ 中的程度，从而抑制 M3Ti 的形成。在镍钛侧进行激光偏移可以提高镍钛和铂铱对接接头的强度和延展性。

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引用次数: 0