Article
Chemistry, Physical
Yu-Qiang Jiang, Y. C. Lin, Guan-Qiang Wang, Guo-Dong Pang, Ming-Song Chen, Zhi-Chao Huang
Summary: The microstructure evolution of a Ti-55511 alloy deformed at high temperatures and wide strain rate range was studied, and a unified constitutive equation was established to describe the evolution of flow stress, grain size, and dynamic recrystallization fraction. Experimental results showed different structures were formed within the alloy under different deformation conditions, with DRX fraction and sub-grain size changing with increasing deformation temperature and strain rate.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Xuyong Zheng, Chen Xu, Yi Cai, Binbin Zhang
Summary: This study investigated the tensile deformation and corrosion performance of Ti-6Al-4V ELI titanium alloy. The results showed that tensile deformation induced grain rotation, leading to a decrease in texture strength. Plastic deformation and acidic environments were found to be detrimental to the corrosion resistance of the titanium alloy.
Article
Chemistry, Physical
Ning Tian, Wenjun Ye, Xiaoyun Song, Songxiao Hui
Summary: The SP700 titanium alloy exhibited excellent superplasticity with fine grain size and increased volume fraction of the beta phase as strain increased. The beta-stabilizing elements were mainly dissolved within the beta phase and diffused from alpha to beta phase during deformation. The increase in strain led to the accumulation of dislocations and an increase in the proportion of low angle grain boundaries.
Article
Chemistry, Physical
Yu Fu, Wenlong Xiao, Junshuai Wang, Xinqing Zhao, Chaoli Ma
Summary: In this study, the evolution of an alpha + beta dual-phase structure with varying alpha phase fraction was systematically investigated in a Ti alloy through annealing at different temperatures. The mechanical properties and deformation mechanisms were also studied. The results showed that increasing the alpha phase enhanced the stability of the retained beta matrix and decreased the beta domain size. The deformation mechanisms changed with the increasing alpha phase, leading to changes in mechanical properties. A microstructure composed of ultrafine grained alpha + beta dual phase showed a good combination of low Young's modulus, high strength, and high ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Yu Zhou, Ke Wang, Honghui Li, Xin Wen, Renlong Xin
Summary: This study investigates the influence of equiaxed α content (a(e)) and configuration of α lamellas on the deformation mechanism and tensile properties of near-α titanium alloy. The bimodal microstructures (BMs) comprised of a(e) and parallel α lamellas (a colony) and basket-weave α lamellas (a basketweave) are denoted as BMC and BMB, respectively. With decreasing content of a(e), BMB shows higher strength and lower elongation reduction compared to BMC. Under the same content of a(e), BMB exhibits higher strength and better elongation than BMC. The deformation mechanisms of fully equiaxed microstructure (FEM), BMC, and BMB are investigated, revealing that prismatic slip is the dominant slip system and dislocation multiplication of prismatic slip dominates all a(e) grains. Basket-weave microstructure shows better slip transfer restraint and absence of continuous a(GB), leading to higher strength and better elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Chunlei Qiu, Qi Liu, Rengen Ding
Summary: A beta titanium alloy, Ti-10V-2Fe-3Al, was processed by pulsed selective laser melting to fabricate samples with high strength and ductility. Dislocation slipping was identified as the dominant deformation mechanism during tensile testing, with the high yield strength attributed to the suppression of transformation and the fine grain and cell structures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Gaurav Singh, Paul M. Souza
Summary: This study characterized the hot deformation behavior of a newly developed alpha + beta titanium alloy Ti407 and investigated its processing performance at different temperatures and strain rates. The results revealed the existence of three stable domains within specific temperature and strain rate ranges, with the alpha + beta and beta phases identified as the optimum hot working regions for Ti407. Simulations and analysis were conducted to determine the processing conditions and optimization strategies for Ti407.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Xintian Wang, Chunlei Qiu
Summary: A selectively laser melted and hot isostatically pressed high entropy alloy was aged at different temperatures to study its microstructural evolution. The formation of nano-sized ordered structures and precipitates was observed at lower temperatures, while higher temperatures led to increased particle fractions and sizes with the disappearance of ordered structures. Samples with ordered structures and fine precipitates exhibited higher yield strength, ultimate tensile strength, and ductility compared to those without ordered structures and with larger precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
B. Gu, P. Chekhonin, S. W. Xin, G. Q. Liu, C. L. Ma, L. Zhou, W. Skrotzki
Summary: The deformation temperature and strain rate influenced the deformation mechanism and texture formation of the metastable beta-titanium alloy Ti5321 during hot-compression. Decreasing Zener-Hollomon parameter Z led to a shift towards dynamic recovery and dynamic recrystallization, resulting in a < 100 > < 111 > double-fiber texture. Dynamic globularization of the alpha-phase and promotion of beta-grain formation by continuous dynamic recrystallization contributed to the flow softening behavior of Ti5321.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Ammarueda Issariyapat, Abdollah Bahador, Patama Visuttipitukul, Shufeng Li, Junko Umeda, Katsuyoshi Kondoh
Summary: This study investigates the enhancement of ductility in SLM-processed Ti-(N) materials through post-heat treatment N dissolution, finding that quenching significantly increases ductility by altering grain morphology, dislocations, and N distribution. Examination techniques such as EPMA, TEM, high-temperature SEM observation, and in-situ EBSD observation during tensile testing were utilized to clarify the microstructural evolution and deformation response of the materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Yong Wu, Ronglei Fan, Minghe Chen, Kehuan Wang, Jie Zhao, Wenchao Xiao
Summary: The study focused on investigating the high-temperature anisotropy and microstructure evolution mechanisms of the rolled TA32 titanium alloy sheet. It was found that the TD sample exhibited the largest peak strength, while the DD sample displayed the highest elongation. The dominant dislocation slip modes for RD, DD, and TD samples were identified as prismatic slip, the coupling of basal and prismatic slips, and pyramidal slips, respectively. Furthermore, the DRX mechanism of TA32 titanium alloy during hot deformation was a combination of DDRX and CDRX, which could weaken the anisotropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Manufacturing
Yongliang Geng, Meng Zhao, XinZhi Li, Ke Huang, Xuan Peng, Binbin Zhang, Xuewei Fang, Yugang Duan, Bingheng Lu
Summary: 5xxx aluminum alloys are widely used in various industries due to their good weldability and corrosion resistance, but their strength is inferior to 2xxx and 7xxx alloys, limiting their application in high load-bearing conditions. In order to improve the mechanical properties of additively manufactured Al5183 aluminum alloy, titanium fiber-reinforced Aluminum (TFRA) components were fabricated for the first time using a wire-based directed energy deposition-arc manufacturing (DED-arc) method. The TFRA components showed significantly improved yield and tensile strength, as well as impact energy, by adding titanium fibers. This work provides a promising way to fabricate high strength aluminum alloy with continuous fiber through DED-arc.
ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
Yixin An, Yechen Deng, Xiaoyong Zhang, Bingfeng Wang
Summary: The hot deformation mechanism of a Ti-2.5Zr-2Al titanium alloy was investigated using the double-cone compression test, providing a theoretical basis for designing an optimal alpha+beta forging process. Ultra-fine grains were obtained through hot compression at 800 degrees C, with a detailed analysis of the deformation mechanisms involved.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Xintian Wang, Xingyu Pan, Pengyue Sun, Chunlei Qiu
Summary: By adding TiAl powder particles into CoCrFeMnNi HEA and processing with selective laser melting, the developed microstructure led to enhancements in 0.2% yield strength, ultimate tensile strength, and strain hardening rates. The presence of microstructural features such as L1(2) domains, intragranular precipitates, and grain boundary precipitates played a key role in improving the mechanical properties of the samples.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Pengyue Sun, Chunlei Qiu
Summary: The addition of TiAl particles in 316L stainless steel resulted in the formation of numerous nano-sized gamma-TiAl precipitates, leading to refined grain structure and significantly increased ultimate tensile strength. The TiAl particles acted as effective dislocation motion barriers, improving the material's 0.2% yield strength. However, un-melted TiAl particles also caused reduced ductility by acting as preferential crack initiation and propagation sites during deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
