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Lin HK, Huang CW, Lin YH, Chuang WS, Huang JC. Effects of Accumulated Energy on Nanoparticle Formation in Pulsed-Laser Dewetting of AgCu Thin Films. Nanoscale Res Lett 2021; 16:110. [PMID: 34191148 PMCID: PMC8245639 DOI: 10.1186/s11671-021-03564-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 06/14/2021] [Indexed: 06/13/2023]
Abstract
Ag50Cu50 films were deposited on glass substrates by a sputtering system. Effects of accumulated energy on nanoparticle formation in pulse-laser dewetting of AgCu films were investigated. The results showed that the properties of the dewetted films were found to be dependent on the magnitude of the energy accumulated in the film. For a low energy accumulation, the two distinct nanoparticles had rice-shaped/Ag60Cu40 and hemispherical/Ag80Cu20. Moreover, the absorption spectra contained two peaks at 700 nm and 500 nm, respectively. By contrast, for a high energy accumulation, the nanoparticles had a consistent composition of Ag60Cu40, a mean diameter of 100 nm and a peak absorption wavelength of 550 nm. Overall, the results suggest that a higher Ag content of the induced nanoparticles causes a blue shift of the absorption spectrum, while a smaller particle size induces a red shift.
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Affiliation(s)
- H K Lin
- Graduate Institute of Materials Engineering, National Pingtung University of Science and Technology, 1, Hseuhfu Road, Pingtung 912, Taiwan, ROC.
| | - C W Huang
- Graduate Institute of Materials Engineering, National Pingtung University of Science and Technology, 1, Hseuhfu Road, Pingtung 912, Taiwan, ROC
- Department of Plant Medicine, National Pingtung University of Science and Technology, 1, Hseuhfu Road, Pingtung 912, Taiwan, ROC
| | - Y H Lin
- Department of Plant Medicine, National Pingtung University of Science and Technology, 1, Hseuhfu Road, Pingtung 912, Taiwan, ROC
| | - W S Chuang
- Department of Materials Science and Engineering, Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong.
| | - J C Huang
- Department of Materials Science and Engineering, Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong
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Du XH, Li WP, Chang HT, Yang T, Duan GS, Wu BL, Huang JC, Chen FR, Liu CT, Chuang WS, Lu Y, Sui ML, Huang EW. Dual heterogeneous structures lead to ultrahigh strength and uniform ductility in a Co-Cr-Ni medium-entropy alloy. Nat Commun 2020; 11:2390. [PMID: 32404913 PMCID: PMC7220923 DOI: 10.1038/s41467-020-16085-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 04/14/2020] [Indexed: 11/21/2022] Open
Abstract
Alloys with ultra-high strength and sufficient ductility are highly desired for modern engineering applications but difficult to develop. Here we report that, by a careful controlling alloy composition, thermomechanical process, and microstructural feature, a Co-Cr-Ni-based medium-entropy alloy (MEA) with a dual heterogeneous structure of both matrix and precipitates can be designed to provide an ultra-high tensile strength of 2.2 GPa and uniform elongation of 13% at ambient temperature, properties that are much improved over their counterparts without the heterogeneous structure. Electron microscopy characterizations reveal that the dual heterogeneous structures are composed of a heterogeneous matrix with both coarse grains (10∼30 μm) and ultra-fine grains (0.5∼2 μm), together with heterogeneous L12-structured nanoprecipitates ranging from several to hundreds of nanometers. The heterogeneous L12 nanoprecipitates are fully coherent with the matrix, minimizing the elastic misfit strain of interfaces, relieving the stress concentration during deformation, and playing an active role in enhanced ductility. Improving both strength and ductility simultaneously in structural metals and alloys remains a challenge. Here, the authors design a heterogeneous structure in a Co-Cr-Ni alloy that results in ultrahigh strength and significant uniform elongation.
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Affiliation(s)
- X H Du
- Department of Materials Science and Engineering, Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong.,School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang, China
| | - W P Li
- Department of Materials Science and Engineering, Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong
| | - H T Chang
- School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang, China
| | - T Yang
- Department of Materials Science and Engineering, Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong
| | - G S Duan
- School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang, China
| | - B L Wu
- School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang, China
| | - J C Huang
- Department of Materials Science and Engineering, Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong. .,Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, Taiwan.
| | - F R Chen
- Department of Materials Science and Engineering, Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong
| | - C T Liu
- Department of Materials Science and Engineering, Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong
| | - W S Chuang
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, Taiwan
| | - Y Lu
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, China
| | - M L Sui
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, China
| | - E W Huang
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan
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