Article
Materials Science, Multidisciplinary
Christian Rowolt, Benjamin Milkereit, Armin Springer, Mami Mihara-Narita, Hideo Yoshida, Kenya Yamashita, Kevin Oldenburg, Olaf Kessler
Summary: This study investigated the quench sensitivity of a high-purity wrought aluminum alloy, comparing a pure alloy to one with additional elements. Differential scanning calorimetry was used to analyze precipitation reactions during cooling at different rates. The pure alloy showed low quench sensitivity and stable hardness values at lower cooling rates, while the alloy with additional elements had a higher critical cooling rate for aging reactions, but the physical critical cooling rate for precipitation suppression was the same for both alloys around 10 K/s.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
E. Scharifi, U. Savaci, Z. B. Kavaklioglu, U. Weidig, S. Turan, K. Steinhoff
Summary: The research found that the tool temperature significantly affects the strength and microstructure of AA7075 aluminum alloy, causing fundamental changes in microstructure and strain hardening behavior when exceeding a certain temperature limit. At tool temperatures below 200℃, there is only a slight decrease in tensile strength, while above 200℃, there is a significant drop in tensile strength and an increase in the initial strain hardening rate.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Shuaijiang Yan, Richu Wang, Chaoqun Peng, Zhiyong Cai, Jian Peng
Summary: The 7055-Mg alloy with higher Mg content showed significantly improved mechanical strength compared to the 7055 alloy doped with other elements and particles. The addition of 1 wt.% Mg promoted the precipitation of eta' phase, leading to a finer grain size and more uniform microstructure. Post heat treatment allowed for tailoring the volume fractions and sizes of eta' phases, optimizing the mechanical properties of the samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Ang Xiao, Changqing Huang, Xiaohui Cui, Ziqin Yan, Zhuoxing Yu
Summary: The effect of pulse induced current on the mechanical properties and microstructure of 7075-T6 aluminum alloy was thoroughly investigated, revealing significant changes in the alloy's strength, elongation, dislocation density, grain size, and texture. The interaction between joule phenomenon and electric effects of the current was found to contribute to the observed changes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Dung-Yi Wu, Chengyun Miao, Christopher S. DiMarco, K. T. Ramesh, Todd C. Hufnagel
Summary: Designing aluminum alloys for spall resistance involves understanding the active failure mechanisms under dynamic loading. This study uses a high-throughput laser-driven micro-flyer plate impact technique to investigate the spall failure of aluminum alloy Al7085-T711 and its microstructure. The results show that the spall strength of Al7085-T711 increases with increasing strain rate and peak shock stress. Incipient spall voids primarily initiate at Al7Cu2Fe second-phase particles. Eliminating these particles significantly improves the spall strength, suggesting the potential for improved spall resistance in commercial alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Tianchun Zou, Siyuan Mei, Minying Chen
Summary: In this study, the Al-4.8Mg-0.82Sc-0.28Zr alloy was fabricated by selective laser melting and its formability, microstructure, precipitation behavior, and mechanical properties were systematically investigated. The results showed that the alloy exhibited good forming quality and excellent mechanical properties under specific process parameters.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Qianqian Ren, Hongfeng Huang, Jianan Yang, Piaoqi Lu, Shuhui Liu, Degui Li, Hu Xie, Lili Wei
Summary: This study investigated the microstructure, mechanical properties, and electrical conductivity of 7085 alloy sheets with and without Sc at different solid solution temperatures. The results showed that the addition of Sc resulted in smaller grain size and higher strength. The optimum solid solution temperature for the alloys also varied.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Hossein Hassanpour, Roohollah Jamaati, Seyed Jamal Hosseinipour
Summary: The AA5052 with a gradient strain and microstructure was produced by the accumulative compression bonding process in this study. A gradient microstructure was observed in the fourth pass sample, with elongated grains in the soft layer and fine equiaxed grains in the hard layers due to dynamic recrystallization. The fourth pass sample exhibited a good combination of high strength and high ductility, showing a recovery of strain hardening rate phenomenon with a remarkable improvement in strength.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
S. Zhang, X. Luo, G. Y. Zheng, R. Hu, H. Wang, M. H. Li
Summary: The thermal stability of CR 7085 Al alloy was investigated. It was found that the size of eta ' and eta precipitates increased gradually with the increase of annealing temperature, and equiaxed nanograins were formed at 250℃ and 300℃. The strength of the samples decreased gradually with the increase of annealing temperature, while the ductility increased gradually until a sudden drop at 250℃.
Article
Materials Science, Multidisciplinary
Fei Guo, Weijiu Huang, Xusheng Yang, Haipeng Dong, Hang Yu, Qiuyu Chen, Li Hu, Luyao Jiang
Summary: In this study, the effect of preheating on the mechanical properties and microstructure of AA2099 Al-Li alloy was investigated by designing different preheating schedules. The results showed that preheating had a significant impact on the mechanical properties of as-rolled sheets, and the variation was mainly attributed to the different precipitates formed during preheating.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Z. Delbari Ragheb, S. G. Shabestari, Y. Najafi
Summary: This study investigates the influence of the thixoforming process on the microstructure and mechanical properties of modified and grain refined 319 aluminum alloy. The strain-induced melt activated (SIMA) process is used to achieve suitable microstructure for semi-solid processing. Thixoforming eliminates defects and produces a spherical structure with enhanced mechanical properties. The hardness and tensile strength, yield strength, elongation, and toughness of the alloy are significantly improved after thixoforming compared to the as-cast state.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
S. Zhang, X. Luo, G. Y. Zheng, N. Z. Zhai, Y. Q. Yang, P. T. Li
Summary: Cryorolling can effectively prevent room temperature rolling cracking of high-strength aluminum alloy. The study found that cryorolled samples exhibited higher yield strength and ultimate tensile strength, but lower elongation to failure. After peak ageing treatment, the yield strength and ultimate tensile strength of the samples further increased, while the elongation to failure also increased.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Sheng Jie Yao, Qing Hua Tang, Jie Yang, Chun Yun Wang, Hao Feng Sun, Run Lin Rong, Hao Ran Sun, Guan Nan Chu
Summary: To reduce the cost of hot stamping of aluminum alloys and develop high-strength aluminum alloy parts for light-weight car body, a short-time solid solution (SS) followed by shot-time artificial aging process was implemented on 6061 aluminum alloy. The microstructural evolution was characterized using XRD, OM, SEM-EDS, and HR-TEM. The short-time SS treatment reduced the holding time for SS by 80%, and peak aging was achieved at 200°C for only 60 minutes, resulting in the formation of acicular nano-size β phase and precipitate-free-zone (PFZ) along the grain boundaries. The tensile properties met the 6061 T6 standard, and the accelerated diffusion of magnesium and silicon atoms played a significant role in the micro stress introduced by superheated degree along with short-time treatment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Hanieh Azimi, Salman Nourouzi, Roohollah Jamaati
Summary: The study investigated the effects of Ti powder addition and T6 heat treatment on the microstructure and mechanical properties of A356-based composites. It was found that the addition of Ti led to changes in silicon nucleation, size, and porosity, with the T6 heat treatment transforming the eutectic Si structure. The composite with 0.5 wt% Ti showed the highest ultimate tensile strength among all samples, with improvements in hardness and tensile strength compared to the A356 alloy attributed to the presence of Ti and Al3Ti phases. The fracture surface of the A356/Ti composites was mainly covered by cleavage features.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Matic Jovicevic-Klug, Rok Rezar, Patricia Jovicevic-Klug, Bojan Podgornik
Summary: This paper discusses the effect of deep cryogenic treatment (DCT) on the evolution of natural and artificial aging of Al-Mg-Si alloy EN AW 6026. The study provides evidence of DCT effect on dispersoids and their development in aluminum alloys. DCT induces reformation and regrowth of dispersoids during natural aging, leading to changes in shape and chemical composition. It also affects the hardness evolution with aging time. The study also explores the influence of DCT exposure duration and homogenization temperature on the hardness evolution during natural aging.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
