Article
Nanoscience & Nanotechnology
Jyoti Ranjan Sahoo, Aparna Tripathi, Sumeet Mishra
Summary: A new low temperature interrupted quenching treatment (80°C_1h) is proposed for Al-Mg-Si alloys, exhibiting high work hardening ability, lower concentration of free vacancies, and stable precursors for β precipitates, leading to good formability during processing and high strength after final paint-bake treatment.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Liang Zhu, Mingxing Guo, Yuan Wu, Huihui Zhu, Jishan Zhang
Summary: This study reports a new strategy to greatly enhance the bake-hardening response of AlMg-Si-Cu-Zn alloys, which may have wide applications in the automotive industry.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Abbas Mohammadi, Nariman A. Enikeev, Maxim Yu Murashkin, Makoto Arita, Kaveh Edalati
Summary: The study achieved nanograin sizes in an Al-La-Ce alloy through ultra-SPD followed by aging, and identified two breaks in the Hall-Petch relationship. Detailed analysis confirmed that nanograin formation alone is not sufficient for extra hardening, and additional strategies such as grain-boundary segregation and precipitation are necessary to address the issue of softening.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Kaichi Saito, Makio Suzuki, Yuichiro Hayasaka, Kana Takenaka, Satoshi Semboshi
Summary: The study compares the mechanical properties and microstructures of the Cu96Ti4 alloy and its Mg-doped counterpart. The Mg-doped alloy exhibits superior mechanical properties to the binary alloy, with differences in microstructure observed.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Lukas Stemper, Matheus A. Tunes, Phillip Dumitraschkewitz, Francisca Mendez-Martin, Ramona Tosone, Daniel Marchand, William A. Curtin, Peter J. Uggowitzer, Stefan Pogatscher
Summary: This study presents a thermomechanical processing concept that utilizes the full industrial application potential of AlMgZn(Cu) alloys. The beneficial linkage of alloy design and processing achieves a balance between high mechanical strength and good formability while addressing the need for economically feasible processing times. The alloys investigated show high formability and a rapid hardening response, with significant enhancement by the addition of Cu, after short pre-aging treatments and final heat treatments.
Article
Automation & Control Systems
Sara Bocchi, Gianluca D'Urso, Claudio Giardini
Summary: This study analyzed the effect of heat generated during friction stir welding on aluminum alloys, finding a relationship between thermal gradient, process parameters, and alloy type. Hardness distribution was related to cooling systems, with water-cooled joints showing higher hardness values in thermo-mechanically affected and heat-affected zones. Tensile tests showed a reduction in real elongation percentage in water-cooled joints for all alloys, possibly due to increased hardness leading to decreased elongation.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(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
Furkan Ozdemir, Chathuranga Sandamal Witharamage, Ahmed Abdelazim Darwish, Hasan Okuyucu, Rajeev Kumar Gupta
Summary: High energy-ball milling (HEBM) has significant influence on corrosion and hardness of age hardening aluminum alloys, leading to improved corrosion resistance and hardness in the alloys. Nanocrystalline structure, extended solid solubility, and homogenous microstructure are key factors for the superior performance of age hardening ball milled alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Gao Guan-jun, Li Xi-wu, Yan Li-zhen, Xiong Bai-qing, Li Zhi-hui, Zhang Yong-an, Wen Kai, Li Ya-nan
Summary: This study investigates the effects of dynamic cooling pre-aging treatment on an Al-Mg-Si alloy sheet. It is found that the treatment at low temperature region reduces the paint-bake hardening ability, while increasing the cooling pre-aging temperature improves the stability and hardening ability.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Materials Science, Multidisciplinary
Nozar Anjabin
Summary: In this study, the classical Kampmann and Wagner numerical model of spherical precipitates is extended to model the kinetics of spheroidal shape precipitates evolution during the aging treatment of Al alloys. A new rate law is proposed using a similarity solution of the transient diffusion problem around the spheroidal precipitates, with different aspect ratios, and moving boundaries. The modified age-hardening model considers the effects of precipitate shape, size and volume fraction to predict the variation of alloy hardness during the aging process.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Steffen Lotz, Emad Scharifi, Ursula Weidig, Kurt Steinhoff
Summary: The increasing demand for hot stamped aluminum components in automotive and aerospace industries has led to the need for efficient and resource-conserving thermo-mechanical processes. This study focuses on the combined effect of forming and aging processes on the mechanical properties of high-strength aluminum alloys AA6082 and AA7075. Two different thermo-mechanical aging process strategies are proposed, resulting in significant reduction in process time from 24 h to 5 h while maintaining similar mechanical properties as the conventional T6 peak aged condition.
Article
Materials Science, Multidisciplinary
Steffen Lotz, Jiali Zhang, Emad Scharifi, Roland Morak, Ursula Weidig, Juergen Goeken, Christoph Broeckmann, Kurt Steinhoff
Summary: The present study investigated the influence of different aging conditions on the strain-dependent damping of the high-strength aluminum alloy AA7075. The correlations between microstructural evolution, hardness development, and individual material damping were identified through various artificial aging strategies. The results showed that different aging conditions resulted in characteristic behaviors in the strain-dependent range, and the hardness decreased with increasing aging time or temperature.
Article
Nanoscience & Nanotechnology
Yi-Jia Li, Yuan Fang, Cheng Wang, Zhen-Ming Hua, Yipeng Gao, Min Zha, Hui-Yuan Wang
Summary: The study discovered that twin boundary pinning is a new hardening mechanism in Mg-2Zn-0.5Ca alloy during bake-hardening, enhancing the strength-ductility synergy. The co-segregation of Zn and Ca atoms at twin boundaries effectively suppresses crack propagation, improving the material's ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Beomjin Na, Bi-Cheng Zhou, C. Wolverton, Kyoungdoc Kim
Summary: The study presented a new low-energy atomic structure of the Al2CuLi (T-1) phase, refined the Li positions in the proposed structure, and found a tie-line between T-1 phase and Al at finite temperature. A low-energy T-1/Al coherent interfacial structure was derived, showing agreement with experimental observations of Ag and Mg solutes segregating to the coherent interface.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Soung Yeoul Ahn, Jongun Moon, Yeon Taek Choi, Eun Seong Kim, Sang Guk Jeong, Jeong Min Park, Mungu Kang, Hyomoon Joo, Hyoung Seop Kim
Summary: The microstructure and mechanical properties of AlSi10Mg alloy fabricated by selective laser melting were investigated in this study. Substantial hardening was achieved by aging heat treatment. The alloy shows excellent combination of strength and ductility, attributed to its fine cellular structure and nanoscale needle-like precipitates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
