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A molecular dynamics study on the Mie-Grüneisen equation-of-state and high strain-rate behavior of equiatomic CoCrFeMnNi 等原子CoCrFeMnNi的mie - grisen状态方程及高应变速率行为的分子动力学研究
1区 材料科学 Q1 Materials Science Pub Date : 2023-11-14 DOI: 10.1080/21663831.2023.2280635
James A. Stewart, Jacob K. Startt, Remi Dingreville
Through atomistic simulations, we uncover the dynamic properties of the Cantor alloy under shock-loading conditions and characterize its equation-of-state over a wide range of densities and pressures along with spall strength at ultra-high strain rates. Simulation results reveal the role of local phase transformations during the development of the shock wave on the alloy's high spall strength. The simulated shock Hugoniot results are in remarkable agreement with experimental data, validating the predictability of the model. These mechanistic insights along with the quantification of dynamical properties can drive further advancements in various applications of this class of alloys under extreme environments.
通过原子模拟,我们揭示了康托合金在冲击载荷条件下的动态特性,并表征了其在大范围密度和压力下的状态方程,以及超高应变速率下的小片强度。仿真结果揭示了激波发展过程中的局部相变对合金的高劈裂强度的影响。模拟冲击Hugoniot结果与实验数据非常吻合,验证了模型的可预测性。这些机制的见解以及动态特性的量化可以推动这类合金在极端环境下的各种应用的进一步发展。
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引用次数: 0
Thermal conductivity enhancement of aluminum scandium nitride grown by molecular beam epitaxy 分子束外延生长氮化铝钪的热导率增强
1区 材料科学 Q1 Materials Science Pub Date : 2023-11-14 DOI: 10.1080/21663831.2023.2279667
Gustavo A. Alvarez, Joseph Casamento, Len van Deurzen, Md Irfan Khan, Kamruzzaman Khan, Eugene Jeong, Elaheh Ahmadi, Huili Grace Xing, Debdeep Jena, Zhiting Tian
Aluminum scandium nitride (AlScN) has been receiving increasing interest for radio frequency microelectromechanical systems because of their higher achievable bandwidths owing to the larger piezoelectric response of AlScN compared to AlN. However, alloying scandium (Sc) with aluminum nitride (AlN) significantly lowers the thermal conductivity of AlScN due to phonon alloy scattering. Self-heating in AlScN devices potentially limits power handling, constrains the maximum transmission rate, and ultimately leads to thermal failure. We grew plasma-assisted molecular beam epitaxy (PAMBE) AlScN on AlN-Al2O3 and GaN-Al2O3 substrates, and compared the cross-plane thermal conductivity to current work on AlScN grown on Si substrates.
氮化铝钪(AlScN)越来越受到射频微机电系统的关注,因为与AlN相比,AlScN具有更大的压电响应,从而具有更高的可实现带宽。然而,将钪(Sc)与氮化铝(AlN)合金化后,由于声子合金的散射,AlScN的导热系数显著降低。AlScN器件中的自加热可能会限制功率处理,限制最大传输速率,并最终导致热故障。我们在AlN-Al2O3和GaN-Al2O3衬底上生长了等离子体辅助分子束外延(PAMBE) AlScN,并将其与目前在Si衬底上生长的AlScN的平面导热性进行了比较。
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引用次数: 0
In-situ atomic-scale observation of dislocation and deformation twin interaction in FeMnCoCr high-entropy alloy FeMnCoCr高熵合金中位错与变形孪晶相互作用的原位原子尺度观察
1区 材料科学 Q1 Materials Science Pub Date : 2023-11-09 DOI: 10.1080/21663831.2023.2275600
Yan Ma, Keliang Qiu, Ning Xu, Chengpeng Yang, Jiabao Zhang, Zihao Zhang, Qingsong Deng, Yonghai Yue, Lihua Wang, Xiaodong Han
The deformation of a single-crystal Fe48Mn32Co10Cr10 alloy is captured in situ at the atomic scale. The results show that full and partial dislocations, along with deformation twins, are involved in the deformation process. Partial dislocation activities result in the formation of nanotwins, high-density coherent twin boundaries, and incoherent twin boundaries. Full dislocations interact with the coherent/incoherent twin boundaries, and partial dislocations, thereby producing high strength and remarkable strain hardening. The observed high activity of full dislocations can be attributed to the inhomogeneous distribution of solid solution atoms in the alloy.
在原子尺度上原位捕获了Fe48Mn32Co10Cr10合金的变形。结果表明,变形过程中存在完全位错和部分位错以及变形孪晶。部分位错活动导致纳米孪晶、高密度共晶孪晶界和非共晶孪晶界的形成。完全位错与共格/非共格孪晶界和部分位错相互作用,从而产生高强度和显著的应变硬化。观察到的全位错高活性可归因于合金中固溶体原子的不均匀分布。
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引用次数: 0
Synergistic improvement of strength and plasticity of Mg-6Li-3Al-1Sn alloy by microstructure regulation via rotary swaging 旋锻组织调控协同提高Mg-6Li-3Al-1Sn合金的强度和塑性
1区 材料科学 Q1 Materials Science Pub Date : 2023-11-08 DOI: 10.1080/21663831.2023.2278589
Gang Zhou, Yan Yang, Yangyang Luo, Qian Li, Qun Luo, Yu Zhang, Bin Jiang, Xiaodong Peng, Fusheng Pan
A Mg-6Li-3Al-1Sn (LAT631) alloy with a bimodal-grained structure was prepared via hot extrusion, followed by room temperature rotary swaging (RTRS). The as-extruded LAT631 alloy undergoes dynamical recrystallization, and massive twins are introduced during RTRS. Especially, Al segregation is generated with massive Al solutes surrounding Sn-rich particles via RTRS. Introducing twins and Al-rich segregation are critical factors for enhancing strength, and the increased proportion of DRXed grains is beneficial to improving the elongation in RSed alloy. This research demonstrates that strategic control of recrystallization and segregation by rotary swaging provides an innovative approach to optimizing the mechanical properties of Mg-Li alloys.
采用热挤压-室温旋锻法制备了具有双峰晶组织的Mg-6Li-3Al-1Sn (LAT631)合金。挤压态LAT631合金发生动态再结晶,在RTRS过程中产生大量孪晶。特别是当大量Al溶质包围富锡粒子时,通过RTRS产生了Al偏析。引入孪晶和富al偏析是提高RSed合金强度的关键因素,DRXed晶粒比例的增加有利于提高RSed合金的延伸率。该研究表明,通过旋转锻压对再结晶和偏析的策略控制为优化Mg-Li合金的力学性能提供了一种创新的方法。
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引用次数: 0
In situ TEM studies of relaxation dynamics and crystal nucleation in thin film nanoglasses 薄膜纳米玻璃弛豫动力学和晶体成核的原位透射电镜研究
1区 材料科学 Q1 Materials Science Pub Date : 2023-11-05 DOI: 10.1080/21663831.2023.2278597
Hendrik Voigt, Aaron Rigoni, Evgeniy Boltynjuk, Harald Rösner, Horst Hahn, Gerhard Wilde
Crystallization processes of glass-glass interfaces in sputtered CuZr thin film nanoglasses were directly studied using in situ heating experiments in a transmission electron microscope (TEM). By combining the in situ technique with a sophisticated symmetry analysis based on nanobeam diffraction patterns (NBDP) and electron correlation microscopy (ECM) to capture the relaxation dynamics in the nanoglass, correlations between excess volume and nucleation kinetics are attained on a microscopic scale. Particularly, glass-glass interfaces with their increased excess volume promote the onset of crystal nucleation.
采用透射电子显微镜(TEM)原位加热实验直接研究了溅射CuZr薄膜纳米玻璃中玻璃-玻璃界面的结晶过程。通过将原位技术与基于纳米束衍射模式(NBDP)和电子相关显微镜(ECM)的复杂对称分析相结合来捕捉纳米玻璃中的弛豫动力学,在微观尺度上获得了过量体积和成核动力学之间的相关性。特别是,玻璃-玻璃界面的过量体积的增加促进了晶体成核的开始。
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引用次数: 0
Tunning the tensile deformation behavior and mechanism of nickel-based superalloy CM247LC by adjusting ageing treatment 通过调整时效处理,调整镍基高温合金CM247LC的拉伸变形行为和机理
1区 材料科学 Q1 Materials Science Pub Date : 2023-11-03 DOI: 10.1080/21663831.2023.2276340
Zhenhuan Gao, Peng Zhang, Jiao Li, Xiufang Gong, Yong Yuan, Xiaolong Song
We investigate the tensile deformation behavior and mechanism of nickel-based superalloy CM247LC, which has been subjected to various ageing treatment schemes, but possesses almost the same γ′ particle size, at 600°C. It is found that the transition in the deformation mode from particle shearing plus microtwinning to particle shearing accounts for the decrease in the work-hardening rate and tensile strength with ageing temperature. Our study provides a new strategy to design the heat treatment schedule to achieve a good compromise between the strength and plasticity for superalloys by tunning the operative deformation and fracture mechanisms.
研究了经过多种时效处理的镍基高温合金CM247LC在600℃下的拉伸变形行为和机理,该合金具有几乎相同的γ′晶粒尺寸。研究发现,随着时效温度的升高,加工硬化率和抗拉强度下降的主要原因是由颗粒剪切+微孪晶向颗粒剪切变形模式的转变。本研究为设计热处理方案提供了一种新的策略,通过调整高温合金的操作变形和断裂机制,实现高温合金强度和塑性的良好平衡。
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引用次数: 0
Progress in additive manufacturing, additive repair and fatigue evaluation of aviation titanium alloy blades 航空钛合金叶片增材制造、增材修复及疲劳评价研究进展
1区 材料科学 Q1 Materials Science Pub Date : 2023-11-02 DOI: 10.1080/21663831.2023.2275599
Lingfeng Wang, Yinghong Li, Liucheng Zhou, Yanshan Lou, Shijie Liu, Dayong Zheng, Min Yi
The aviation industry is a key market that promote additive manufacturing (AM) technology since there are huge demands for precision manufacture of high-value complex structural parts and repair of local defects. Extensive research has been conducted on AM process, characterization, and fatigue evaluation of titanium alloy, but there are rare comprehensive reviews on fatigue evaluation methods used for AM aero-engine blades. Rigorous tests, evaluation, and certification are necessary before AM technology is applied in aero-engine blade repair, although it has shown great advantages in different engineering fields. This paper introduces the application of AM technology in the manufacturing and repair of aero-engine titanium alloy blades, summarizes the key factors affecting the fatigue performance of AM titanium alloys, thoroughly discusses the fatigue mechanism, research methods, and process optimizations of AM parts, and compares the differences among several prediction models in fatigue evaluation of AM titanium alloys.
航空工业对高价值复杂结构件的精密制造和局部缺陷修复有着巨大的需求,是推动增材制造(AM)技术发展的关键市场。对钛合金的增材制造工艺、表征和疲劳评价进行了广泛的研究,但对增材制造航空发动机叶片疲劳评价方法的全面研究尚不多见。尽管增材制造技术在不同的工程领域显示出巨大的优势,但在将其应用于航空发动机叶片维修之前,需要进行严格的测试、评估和认证。介绍了增材制造技术在航空发动机钛合金叶片制造和维修中的应用,总结了影响增材制造钛合金疲劳性能的关键因素,深入探讨了增材制造零部件的疲劳机理、研究方法和工艺优化,并比较了几种增材制造钛合金疲劳评价预测模型的差异。
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引用次数: 0
Compositive role of TiB 2 in microstructure optimization and wear-resistant improvement of selective-laser-melted TiB2 p /CrCoFeNiMn high-entropy composite TiB2在选择性激光熔化TiB2 p /CrCoFeNiMn高熵复合材料组织优化和耐磨性提高中的复合作用
1区 材料科学 Q1 Materials Science Pub Date : 2023-10-27 DOI: 10.1080/21663831.2023.2272805
Zhao Chen, Xiaoli Wen, Weili Wang, Xin Lin, Haiou Yang, Lianyang Chen, Haibin Wu, Wenhui Li, Nan Li
The CoCrFeNiMn high-entropy alloy and TiB2p/CoCrFeNiMn high-entropy composite (HEC) were manufactured by Selective laser melting. For the CoCrFeNiMn, a coarse epitaxial columnar microstructure with strong crystallographic textures was generated. While in the TiB2p/CoCrFeNiMn, TiB2 particles are distributed in the significantly refined dendrites and nearly equiaxial grains, and phase transformation occurs to form σ phase. TiB2 and σ phase construct a strong interface relationship with the matrix. TiB2p/CoCrFeNiMn HEC has extremely high microhardness (329 ± 2 HV) and excellent wear resistance (coefficients of friction 0.31 ± 0.02). The wear mechanism of the HEC was studied refer to the microstructure, composition and hardness.
采用选择性激光熔化法制备了CoCrFeNiMn高熵合金和TiB2p/CoCrFeNiMn高熵复合材料(HEC)。对于CoCrFeNiMn,产生了具有强晶体织构的粗糙外延柱状微观结构。而在TiB2p/CoCrFeNiMn中,TiB2颗粒分布在明显细化的枝晶和近等轴晶中,并发生相变形成σ相。TiB2相和σ相与基体形成了很强的界面关系。TiB2p/CoCrFeNiMn HEC具有极高的显微硬度(329±2 HV)和优异的耐磨性(摩擦系数0.31±0.02)。从组织、成分和硬度等方面研究了HEC的磨损机理。
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引用次数: 0
The nucleation of δ phases triggered by the stacking faults in a single crystal superalloy 单晶高温合金中由层错引发的δ相形核
1区 材料科学 Q1 Materials Science Pub Date : 2023-10-27 DOI: 10.1080/21663831.2023.2272809
Yuan Cheng, Xinbao Zhao, Quanzhao Yue, Wanshun Xia, Qinghai Pan, Yu Zhou, Yuefeng Gu, Ze Zhang
Here we investigated the nucleation of the Re, Ru-rich δ phase affected by stacking faults in the γ phase in a 4th generation Ni-based single crystal superalloy during the service at 800°C. The stacking faults in the γ phase were rich in Re and Ru, similar to the observed δ phase. And the stacking fault regions possessed a similar structure to the δ phase, promoting the transformation from γ phase to δ phase. Furthermore, the calculation results indicated that Ru had more significant promoting effects on the δ phase precipitation than Re, providing a reference for the alloy design.
本文研究了第四代ni基单晶高温合金在800℃高温下γ相层错对富Re、ru δ相形核的影响。γ相层错中含有丰富的Re和Ru,与δ相相似。层错区具有与δ相相似的结构,促进了γ相向δ相的转变。计算结果表明,Ru对δ相析出的促进作用比Re更显著,为合金设计提供了参考。
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引用次数: 0
Dual crack inhibition mechanism of nano-TiC in steel–copper heterostructures formed by laser powder bed fusion 纳米tic在激光粉末床熔合形成的钢-铜异质结构中的双裂纹抑制机制
1区 材料科学 Q1 Materials Science Pub Date : 2023-10-17 DOI: 10.1080/21663831.2023.2264346
Xiaoqiang Wang, Yan Zhou, Shifeng Wen, Yusheng Shi
The formation of microcracks at the interface of steel–copper heterostructures is prone to premature failure, which severely limits the application of heterostructure components. Herein, a new approach was proposed by doping nano-TiC in interface forming by laser powder bed fusion (L-PBF) to prevent the hot crack nucleation and block the solid-state crack propagation in steel–copper heterostructures . Benefitting from the TiC doping, the tensile strength of laminated steel–copper structures increased from 372 to 526 MPa. The findings of this research present a new approach to inhibit cracking in the fabrication of heterostructure component manufacturing using L-PBF.
钢-铜异质组织界面处形成的微裂纹容易过早失效,严重限制了异质组织构件的应用。本文提出了在激光粉末床熔合界面中掺杂纳米tic的新方法,以防止钢-铜异质组织的热裂纹形核和阻止固态裂纹扩展。TiC的掺入使钢-铜层合结构的抗拉强度从372 MPa提高到526 MPa。本研究结果为利用L-PBF制造异质结构件提供了一种抑制裂纹的新方法。
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引用次数: 0
期刊
Materials Research Letters
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