Article
Nanoscience & Nanotechnology
Lei Meng, Youyun Zhang, Mengchao Zang, Mengrui Zhang, Cong Wang, Yu Wang, Xiaoli Zhao, Deliang Zhang
Summary: In this study, Ti-6Al-4V alloy samples with two bi-lamellar microstructures were prepared and analyzed. The alloy with higher Al concentration in the primary alpha lamellae and finer scale of beta t structure lamellae exhibited higher nano hardness and yield strength. The hardening mechanism mainly comes from the hardening of alpha and beta(t) lamellae, as well as the heterostructure induced hardening, while the significantly higher flow stress induced a higher degree of trans-lamellar twinning.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Huan Luo, Jian-bo LI, Jun-liu Ye, Jun Tan, Muhammad Rashad, Xian-hua Chen, Sheng-li Han, Kai-hong Zheng, Tian-tian Zhao, Fu-sheng Pan
Summary: This study successfully prepared AZ91 magnesium matrix composites reinforced by TC4 particles via powder metallurgical method, and investigated the relationship between the mechanical properties and the content of TC4. The results showed that the mechanical properties of the composites reached the optimal point when the TC4 content was 10 wt.%.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Materials Science, Multidisciplinary
Tianmiao Yu, Fengchun Jiang, Chunhe Wang, Mengxin Cao, Zhenqiang Wang, Yunpeng Chang, Chunhuan Guo
Summary: The Ti-6Al-4V alloy hollow spheres were prepared under different sintering temperatures, showing that density and shrinkage increase while porosity of the shell decreases with higher temperature. The Ti-6Al-4V hollow spheres sintered at 1400 degrees C for 180 minutes exhibited the smallest porosity and largest density.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Alireza Dareh Baghi, Shahrooz Nafisi, Heike Ebendorff-Heidepriem, Reza Ghomashchi
Summary: A detailed study comparing the microstructural differences between Ti-6Al-4V parts fabricated via conventional powder metallurgy and laser powder bed fusion routes revealed that L-PBF parts have a higher microhardness with a single phase of martensitic alpha '. On the other hand, parts sintered via powder metallurgy showed two phases with lower microhardness. The rapid cooling of the beta phase had no effect on the hardening of the bulk martensitic hcp alpha ' in L-PBF parts.
Article
Nanoscience & Nanotechnology
Yaoxin Huo, Zhengguan Lu, Min Cheng, Jinping Fan, Junwei Qiao, Lei Xu, Ruipeng Guo, Rui Yang, P. K. Liaw
Summary: This study presents the first investigation on the dwell-fatigue behavior and damage mechanism of as-HIPed Ti-6Al-4V powder compact. The results show that the peak stress and stress ratio have significant effects on dwell fatigue behavior. A crack-initiation and propagation model based on soft-hard grain pairs has been proposed to explain the dwell-fatigue mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Huan Luo, Jianbo Li, Junliu Ye, Yangfan Lu, Jun Tan, Jiangfeng Song, Xianhua Chen, Kaihong Zheng, Fusheng Pan
Summary: In this study, magnesium matrix composites reinforced by Ti-6Al-4V particles were prepared via powder metallurgy. Tensile tests showed that the mechanical properties of the composites reached peak values when the content of Ti-6Al-4V particles was 5 wt%. Digital image correlation technology was used to investigate the strain distribution, revealing that the introduction of Ti-6Al-4V reinforcement could relieve stress concentration and result in composites with high strength and high plasticity.
MATERIALS CHARACTERIZATION
(2022)
Article
Metallurgy & Metallurgical Engineering
Sergey Prikhodko, Dmytro G. Savvakin, Pavlo E. Markovsky, Olexander O. Stasuk, James Penney, Norbert Enzinger, Michael Gaskill, Frank Deley
Summary: Titanium alloys are considered supreme structural materials due to their high specific strength, but their wide use is limited by high cost. Layered structures and friction welding are effective ways to improve material utilization and achieve desirable results in complex structures.
WELDING IN THE WORLD
(2021)
Article
Chemistry, Physical
Byungmin Ahn
Summary: Ti-6Al-4V alloy was prepared using selective laser melting (SLM) method and subjected to heat treatment in this study. The results showed that heat treated samples exhibited a reduction in defects, a change in morphology of the alpha'-martensite, a significant decrease in strength, but an improvement in elongation. An optimal combination of strength and elongation was found at 900°C.
Article
Chemistry, Physical
Mingyuan Zhang, Taotao Cai, Weiliang Lu, Shili Zheng, Ying Zhang, Yi Zhang
Summary: A novel sintering-deoxygenation process was proposed to fabricate Ti-6Al-4V alloy powder with low-cost and low-grade materials. The sintering shrinkage was affected by temperature, holding time, and raw materials, while the oxygen content in precursors influenced the phase composition and diffraction peaks. The hydrogen-assisted Mg deoxygenation method effectively reduced the oxygen level in the final Ti-6Al-4V powders, meeting the requirements of GB/T 34486-2017.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jing Xia, Shaopeng Liu, Bing Zhang, Yungui Chen
Summary: The study on titanium alloys shows that analyzing sintering parameters using central composite designs can improve mechanical properties and sintering density. By using response surface methodology, the optimal sintering parameters were determined and verification experiments showed high reliability.
Article
Nanoscience & Nanotechnology
R. X. Zhao, J. Wang, T. W. Cao, T. Hu, S. S. Shuai, S. Z. Xu, C. Y. Chen, Z. M. Ren, M. Qian
Summary: This study demonstrates the use of high magnetic field heat treatment to modify the microstructure of a Ti-6Al-4V alloy fabricated by laser-powder bed fusion, resulting in improved mechanical properties. The treatment increased the sub-grain boundaries in the alpha-phase and accelerated the coarsening and globularization of the alpha-phase, leading to enhanced tensile ductility. Furthermore, the treatment induced better alignment of the alpha-variants with the < 11-20 >alpha direction, facilitating the activation of prismatic and basal slips.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Arnaud Junet, Alexandre Messager, Arnaud Weck, Yves Nadot, Xavier Boulnat, Jean-Yves Buffiere
Summary: Fatigue specimens of a Ti-6Al-4V alloy containing internal artificial defects were studied. The growth of internal fatigue cracks was monitored in situ by synchrotron X-ray tomography during fatigue tests. Ex situ fatigue tests were also performed on samples with heat treatment or defects exposed to air. The results indicate that internal fatigue cracks grow from the notch in a vacuum environment and exhibit specific fracture surface regions.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Ni Ao, Daoxin Liu, Xiaohua Zhang, Jiwang Zhang, Shengchuan Wu
Summary: This study investigates the effect of initial surface plastic deformation on the fatigue behavior of Ti-6Al-4V alloy. The results show that samples with low plastic deformation severity have higher fatigue strength and accommodate plastic strain by refining the grains.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Physical
Ce Zhang, Fang Yang, Cunguang Chen, Zhimeng Guo
Summary: A fully protected process from Ti sponge to as-sintered materials was adopted to achieve low O/N content in the sintered materials. Fine ELI powder demonstrated excellent sinterability, and capsule-free HIP post-sintering was performed to achieve full density and obtain fine and near-equiaxed alpha grains.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Optics
Seungjong Lee, Zabihollah Ahmadi, Jonathan W. Pegues, Masoud Mahjouri-Samani, Nima Shamsaei
Summary: The study examines laser polishing as a post-processing method for additively manufactured metallic parts, showing that it can reduce surface roughness, improve high cycle fatigue life, and alleviate residual stresses through a secondary stress relief process, resulting in enhanced fatigue strength across all life regimes.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Fei Cao, Pankaj Kumar, Mark Koopman, Chenluh Lin, Z. Zak Fang, K. S. Ravi Chandran
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2015)
Article
Materials Science, Multidisciplinary
P. Kumar, K. S. Ravi Chandran, F. Cao, M. Koopman, Z. Zak Fang
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2016)
Article
Materials Science, Multidisciplinary
Fei Cao, K. S. Ravi Chandran, Pankaj Kumar, Pei Sun, Z. Zak Fang, Mark Koopman
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2016)
Article
Nanoscience & Nanotechnology
K. S. Ravi Chandran, F. Cao, J. C. Newman
SCRIPTA MATERIALIA
(2016)
Article
Engineering, Mechanical
Fei Cao, K. S. Ravi Chandran
INTERNATIONAL JOURNAL OF FATIGUE
(2017)
Article
Nanoscience & Nanotechnology
Fei Cao, K. S. Ravi Chandran, Pankaj Kumar
SCRIPTA MATERIALIA
(2017)
Article
Materials Science, Ceramics
Fei Cao, Hyungkwon Park, Gyuyeol Bae, Jeeae Heo, Changhee Lee
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2013)
Article
Materials Science, Coatings & Films
Fei Cao, Hyungkwon Park, Jeeae Heo, Juhyuk Kwon, Changhee Lee
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2013)
Article
Materials Science, Coatings & Films
Hyungkwon Park, Jeeae Heo, Fei Cao, Juhyuk Kwon, Kicheol Kang, Gyuyeol Bae, Changhee Lee
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2013)