1
|
Lin G, Guo R, Shi X, Han L, Qiao J. Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures. ENTROPY (BASEL, SWITZERLAND) 2022; 24:1777. [PMID: 36554182 PMCID: PMC9778487 DOI: 10.3390/e24121777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 11/28/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Lightweight multiprincipal element alloys (MPEAs) are promising candidates for potential application as engineering materials due to their high strength and low density. In this work, lightweight Ti70Al15V15 and Ti80Al10V10 MPEAs were fabricated via vacuum arc melting. The phases of the Ti70Al15V15 alloys consisted of a BCC phase and a small amount of B2 phase while the Ti80Al10V10 alloys displayed a dual-phase structure with BCC and HCP phases. The different phase compositions led to differences in their mechanical properties. When the temperature changed from 298 K to 77 K, the strength of the alloys further increased and maintained a certain plasticity. This is attributed to the increasing lattice friction stress at cryogenic temperature. TEM observation demonstrated that dislocation played a crucial role in plastic deformation for both the Ti70Al15V15 and Ti80Al10V10 alloys. In addition, Ti80Al10V10 exhibited significant work-hardening capabilities. By analyzing the strengthening mechanism of the alloys, the theoretical yield strength was calculated, and the results agreed with the experimental values. The present results provide new insight into developing lightweight MPEAs containing Ti and Al.
Collapse
Affiliation(s)
- Gongxi Lin
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Ruipeng Guo
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Xiaohui Shi
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Lina Han
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Junwei Qiao
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
| |
Collapse
|
2
|
Jin B, Liu J, Shi Y, Chen G, Zhao Q, Yang S. Solvent-Assisted 4D Programming and Reprogramming of Liquid Crystalline Organogels. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107855. [PMID: 34808005 DOI: 10.1002/adma.202107855] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 11/13/2021] [Indexed: 06/13/2023]
Abstract
Encoding molecular ordering during liquid crystalline network (LCN) formation endows preprogrammed but fixed shape morphing in response to external stimuli. The incorporation of dynamic covalent bonds enables shape reprogramming but also permanently alters the network structures. Here, an entropic approach that can program complex shapes via directed solvent evaporation from an isotropic LCN organogel is discoursed. Different shapes can be erased and reprogrammed from the same LCN on demand depending on the modes of deformation of the organogel during solvent evaporation. The ability to decouple network synthesis and molecular alignment relaxes the requirements to LCN chemistry and alignment methods, allowing for the realization of a variety of origami/kirigami structures and 4D shape morphing of LCNs printed from the digital light processing technique with unattainable spatial and temporal controls.
Collapse
Affiliation(s)
- Binjie Jin
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA, 19104, USA
- Department of Chemical Engineering and Biological Engineering, Zhejiang University, 38th Zheda Road, Zhejiang, 310027, China
| | - Jiaqi Liu
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA, 19104, USA
| | - Yunpeng Shi
- Department of Chemical Engineering and Biological Engineering, Zhejiang University, 38th Zheda Road, Zhejiang, 310027, China
| | - Guancong Chen
- Department of Chemical Engineering and Biological Engineering, Zhejiang University, 38th Zheda Road, Zhejiang, 310027, China
| | - Qian Zhao
- Department of Chemical Engineering and Biological Engineering, Zhejiang University, 38th Zheda Road, Zhejiang, 310027, China
| | - Shu Yang
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA, 19104, USA
| |
Collapse
|