Article
Nanoscience & Nanotechnology
Wandong Li, Lihai Chen, Zhidong Fan, Mingwei Zuo, Xingquan Li, Qiao Lei, Lisong Tang, Qiangguo Li
Summary: The effect of adding trace amounts of Ag and Sc on the age hardening response and microstructure of Mg-8Sn-4Al alloy was investigated. The results showed that Ag and Sc addition significantly increased the hardness of the alloy, refined the grain size, and introduced the heat-resistant Al3Sc phase. Furthermore, Ag and Sc addition also increased the number density and decreased the size of Mg2Sn precipitates. The strength enhancement was mainly attributed to grain refinement, second phase strengthening, solid solution strengthening, and age precipitation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Qiman Wang, Guohua Wu, Xin Tong
Summary: Mg-4Y-3RE-0.5Zr alloy was successfully fabricated using wire arc additive manufacturing (WAAM), and no oxidation inclusion defect, which is commonly observed in Y-containing Mg alloys prepared by laser powder bed fusion (LPBF), was found. However, microstructural inhomogeneity along the building height was observed due to the different cooling rates of different deposited layers and subsequent multiple thermal cycles (MTCs).
Article
Nanoscience & Nanotechnology
Lei Wang, Dong -Rong Liu, Tian Chen, Shaofan Wang, Yang Cao
Summary: Adding low-cost aluminum element to Mg-RE alloy can significantly refine the grain structure in the laser surface remelting process and improve the thermal stability by forming nanoscale intermetallic compounds.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Jixue Zhou, Dongqing Zhao, Shouqiu Tang, Yu Liu, Suqing Zhang, Yunteng Liu, Jianhua Wu, Xiaocun Song, Hongtao Liu, Xinfang Zhang, Pengfei Yan, Xitao Wang
Summary: The microstructure and mechanical properties of a new Mg-4Al-3.5Ca-2Gd (AXE432) alloy were investigated. After heat treatment, the alloy exhibited a refined microstructure with small grain sizes and a strong basal texture. The alloy also demonstrated balanced mechanical properties due to a combination of factors such as grain size, texture, second-phase particles, and strain hardening.
Article
Materials Science, Multidisciplinary
Dongtao Wang, Xiaozu Zhang, Songsong Xu, Hiromi Nagaumi, Xinzhong Li
Summary: The addition of micro Mo, Zr, La and Ce and short-time artificial aging process were found to induce the formation of nanoscale phases in high pressure die-casting Al-Si-Mg-Zn alloy, leading to improved hardness and yield strength.
Article
Chemistry, Physical
Naser A. Alsaleh, Sabbah Ataya, Fahamsyah H. Latief, Mohamed M. Z. Ahmed, Ahmed Ataya, Akrum Abdul-Latif
Summary: Lightweight magnesium alloys and magnesium matrix composites are increasingly used in high-efficiency applications such as automobile, aerospace, defense, and electronic industries. Fatigue failure is a common problem for moving and rotating parts made of cast magnesium and magnesium matrix composites. This study focused on the fatigue behavior of short fibers reinforced and unreinforced AE42 at different temperatures. Results showed that the fatigue strength of the reinforced AE42-C in high-cycle fatigue range was twice that of the unreinforced AE42. However, in the low-cycle fatigue range, the fatigue life of the composite materials was significantly shorter due to their low ductility.
Article
Materials Science, Multidisciplinary
Feng Han, Hua Han, Yu Zhang, Tao Yuan, Caimei Wang
Summary: This study reveals the formation mechanism of the quaternary quasicrystal phase in the Al-Cu-Mg-Zn alloy resistance spot welding nugget. The quasicrystal phase is located at the inner-dendrite zone and exhibits the typical pattern of an icosahedral quasicrystal. It is found that the undercooled remnant liquid forms the icosahedral quasicrystal phase due to the rapid cooling rate of resistance spot welding. This study demonstrates the feasibility of acquiring a massive quasicrystal phase in commercially-used aluminum alloy under common processing conditions.
Article
Nanoscience & Nanotechnology
Ning Fang, Chunming Zou, Zunjie Wei, Hongwei Wang, Rong Zhang, Zheng Ran, Tao Chang
Summary: Increasing solidification pressure leads to reduced SDAS and transformation of eutectic Si morphology in Al alloys. The high pressure promotes the formation of nano-sized particles, enhances hardness and compressive strength, with alloys solidified at 4 GPa showing the highest mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Yi Zhang, Xiao-hui Feng, Qiu-yan Huang, Ying-ju LI, Yuan-sheng Yang
Summary: The mechanical properties and degradation performance of directionally solidified Mg-0.8Ca alloy in Hank's solution were studied and compared with those of the as-cast alloy. The columnar grains in the directionally solidified alloy showed a consistent growth orientation. The directional solidification significantly improved the mechanical strength, ductility, and corrosion resistance of the Mg-0.8Ca alloy.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Metallurgy & Metallurgical Engineering
Yi Zhang, Xiaohui Feng, Qiuyan Huang, Yingju Li, Yuansheng Yang
Summary: In this study, Mg-3 wt.%Zn-0.2 wt.%Ca alloys with different columnar structures were fabricated, and their degradation behavior in 0.9 wt.% NaCl was investigated. The results showed that the alloy with cellular structure experienced homogeneous corrosion and exhibited the lowest corrosion rate. The corrosion rate of the alloy can be evaluated using a parameter α, which is related to the microstructure of the alloy.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyu Liu, Taihe Le, Shuai Yuan, Jinhui Wang, Weili Cheng, Xiaoqiang Li, Peipeng Jin
Summary: In this study, the hot compression test was conducted on Gleeble-3500 simulator to investigate the mechanical properties, microstructure evolution, texture, and dislocation slip of the aged vacuum die-casting Mg-4Al-4(La, Ce) alloy at different compression temperatures. The results showed that the alloy exhibited improved plasticity and decreased flow stress with increasing temperature. The excellent strength and toughness of the alloy at high temperature were attributed to grain refinement strengthening, second-phase reinforcement, and work hardening.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Gaoliang Shen, Zhilei Xiang, Xiaozhao Ma, Jingcun Huang, Yueqing Zhao, Jihao Li, Zhitian Wang, Guodong Shi, Ziyong Chen
Summary: This study prepared a high-strength Al-Zn-Mg-Cu aluminum alloy using rapid solidification and hot extrusion, and analyzed the improvement mechanism of the alloy's microstructure. The results showed that rapid solidification technology could significantly refine the alloy grain. After hot extrusion, the alloy partially recrystallized and formed coarse second-phase and needle-shaped precipitates. After T6 heat treatment, the alloy's tensile strength reached 635.8 MPa, but the elongation decreased to 10.5%. It was found that precipitation strengthening was the main strengthening mechanism.
Article
Chemistry, Physical
Erkan Ustun, Emin Cadirli
Summary: This paper systematically studied the microstructure evolution, microhardness, and tensile properties of Al-8.8La-1.2Ni ternary alloy under various solidification rates. The results showed that the solidification rate significantly influenced both the microstructure and mechanical properties of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Metallurgy & Metallurgical Engineering
Janet M. Meier, Jiashi Miao, Song-Mao Liang, Jun Zhu, Chuan Zhang, Josh Caris, Alan A. Luo
Summary: This study conducted key experiments and CALPHAD calculations to provide critical understanding of high-strength Mg-Gd-Y-Zn alloys. The experimental results were used to validate and improve the thermodynamic database of this alloy system, and accurately predict the development of promising high-strength Mg-Gd-Y-Zn alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Liang Qiao, Shuangming Li, Xin Cao, Hong Zhong, Yumin Wang
Summary: The anisotropy of solid-liquid interface energy plays a fundamental role in dendritic morphology and pattern selection during solidification. Different dendritic morphologies are observed in Al-3 wt% Mg single crystals along different crystal orientations. A non-regular dendritic pattern selection map is constructed to explain the occurrence of different dendrites during alloy solidification.
Article
Chemistry, Physical
Xuejun Huang, Jianyue Zhang, Jiashi Miao, Emre Cinkilic, Qigui Wang, Alan A. Luo
Summary: The study found that adding AlCrTiV HEA particles to molten aluminum can significantly improve the mechanical properties of metal matrix composites, primarily through grain refinement and dispersion strengthening. The interactions between matrix aluminum alloys and the particles are crucial in controlling the final microstructure and properties of the composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Jiashi Miao, Scott Sutton, Alan A. Luo
Summary: The hot deformation behavior of homogenized AA2070 Al-Li-Cu alloy was studied, and it was found that dynamic precipitation of T-1 phase causes back stress at temperatures below 400°C, while intermetallic phases gradually dissolve at temperatures above 400°C, leading to dominant dynamic recrystallization as the softening mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Jianyue Zhang, Peng Peng, Alan A. Luo, Jia She, Aitao Tang, Fusheng Pan
Summary: Dynamic precipitation and grain refinement occurred during low temperature extrusion of ZK60 alloy, leading to improved mechanical properties such as tensile strength and elongation. The presence of dynamic precipitates promoted nucleation of new grains and enhanced the alloy's strength and ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zhenming Li, Qigui Wang, Liming Peng, Alan A. Luo, Penghuai Fu
Summary: This study investigates the cyclic hardening and softening behavior of peak-aged Mg-Nd-based alloys during low cycle fatigue using transmission electron microscopy. The initial cyclic hardening is attributed to the increase in dislocation density and interaction with nano-scale precipitates. Cyclic softening is a result of dislocation shearing through precipitates and the transformation of precipitates in different stages of fatigue. The competing mechanisms of hardening and softening are present throughout the entire fatigue process, with hardening dominating in the beginning and softening taking over after a certain number of cycles, around 350 cycles.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Metallurgy & Metallurgical Engineering
Janet M. Meier, Jiashi Miao, Song-Mao Liang, Jun Zhu, Chuan Zhang, Josh Caris, Alan A. Luo
Summary: This study conducted key experiments and CALPHAD calculations to provide critical understanding of high-strength Mg-Gd-Y-Zn alloys. The experimental results were used to validate and improve the thermodynamic database of this alloy system, and accurately predict the development of promising high-strength Mg-Gd-Y-Zn alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
E. M. R. E. CINKILIC, M. I. C. H. A. E. L. MOODISPAW, J. I. A. N. Y. U. E. ZHANG, J. I. A. S. H. I. MIAO, A. L. A. N. A. LUO
Summary: A new secondary Al-Si-Mg alloy with high Fe content has been developed for die casting applications. The addition of manganese successfully suppressed the formation of a brittle phase and led to improved mechanical properties. This alloy provides a promising path for increasing usage of recycled aluminum with high Fe content in automotive and other applications.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Xuejun Huang, Jiashi Miao, Alan A. Luo
Summary: This paper investigated an important order-disorder transition in the lightweight AlCrTiV high entropy alloy system. It is found that increasing Ti content in the alloys can lower the transition temperature, reduce ordering, and introduce ductility. The new Al10Cr10Ti70V10 alloy exhibits measurable tensile elongation and excellent strengths, showing promise for lightweight applications.
SCRIPTA MATERIALIA
(2022)
Review
Metallurgy & Metallurgical Engineering
Janet M. Meier, Josh Caris, Alan A. Luo
Summary: Mg-rare earth (RE) based systems offer important commercial alloys and opportunities for high strength applications. The phase diagrams, microstructure, and strengthening mechanisms of these systems are complex. This review provides critical insights into phase equilibria and strengthening mechanisms, highlights the combination of precipitation and long period stacking order (LPSO) phases for superior strength and ductility in Mg-RE based cast alloys, and suggests future research directions for alloy design and industrial scale applications.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Jiashi Miao, Chuan Zhang, Andrew D. Klarner, Jianyue Zhang, Emre Cinkilic, Fan Zhang, Alan A. Luo
Summary: This study quantitatively characterized the concurrent precipitation microstructure of Mg17Al12 and Mg2Sn phases in AT72 magnesium alloy using STEM techniques. An improved KWN model was used to simulate the evolution of the microstructure and predict the age hardening behavior, optimizing the composition and heat treatment procedure of precipitation strengthened alloys.
Article
Materials Science, Multidisciplinary
Shuaihang Pan, Jie Yuan, Michael P. Moodispaw, Chase Linsley, Jingke Liu, Alan A. Luo, Alan Taub, Xiaochun Li
Summary: This paper investigates the effects of treating A206 aluminum alloy with TiC nanoparticles on its corrosion resistance. The results show that the dispersion and precipitation of TiC strengthen the grain boundaries and accelerate passivation, leading to improved corrosion resistance of nano-treated A206 alloy under high-strength conditions.
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2023)
Article
Nanoscience & Nanotechnology
Jianyue Zhang, Emre Cinkilic, Xuejun Huang, Gerry Gang Wang, Yuchao (Chad) Liu, J. P. Weiler, Alan A. Luo
Summary: The increased use of lightweight aluminum die castings in the automotive industry has prompted the development of new die casting alloys and their heat treatment processes. This paper presents the development of an integrated precipitation and strengthening framework based on an improved Kampmann-Wagner numerical (KWN) model to predict the hardness and yield strength of high pressure die casting (HPDC) Al-11Si-xMg alloys during T5 aging process. The study shows that the increased Mg content enhances the hardness and yield strength due to the formation of Mg2Si phase and higher precipitate density of needle-like Mg5Si6-beta'' phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Review
Metallurgy & Metallurgical Engineering
Janet M. Meier, Josh Caris, Alan A. Luo
Summary: Mg-rare earth (RE) based systems offer commercial alloys and alloy development opportunities for high strength applications. Phase diagrams and strengthening mechanisms in these complex systems, including precipitation and LPSO phases, are critical for understanding and enhancing alloy properties. Further research is necessary to explore the combination of these phases for alloy design and industrial applications.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
