Article
Chemistry, Physical
Guang Li Bi, Yashuo Wang, Jing Jiang, Jiarui Gu, Yuandong Li, Tijun Chen, Ying Ma
Summary: The microstructure and mechanical properties of extruded Mg-2Y-1Zn, Mg-2Y-0.5Zn-0.5Ni, and Mg-2Y-1Ni alloys were systematically studied, showing the significant influence of different morphologies of LPSO phase on the alloy properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Xiaojie Zhou, Wenying Xiong, Gang Zeng, Hongchao Xiao, Jian Zhang, Xianzheng Lu, Xiaomin Chen
Summary: The combined effects of LPSO orientation and alpha-Mg texture on tensile anisotropy were investigated, with the extrusion direction showing optimal mechanical properties, the 45 degrees direction exhibiting high elongation, and the transverse direction having inferior strength and elongation simultaneously. LPSO orientation contributes to strength anisotropy through different load-bearing strengthening effects along different tensile axes, while alpha-Mg texture contributes to strength anisotropy through stronger grain boundary strengthening effects. However, LPSO orientation, rather than alpha-Mg texture, accounts for ductility anisotropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Xiangsheng Xia, Dayu Shu, Echuan Yang, Chuankai Hu
Summary: The microstructures and mechanical properties of Mg-8.5Gd-4.5Y-0.3Zr alloys with and without Zn addition were investigated in this study, and the strengthening mechanisms of these two alloys were also discussed. The results show that the as-extruded alloy with Zn addition has finer grains due to the inhibited dislocation motion. Dynamic precipitation occurs during the extrusion process and unevenly distributes in both alloys, promoting grain refinement. The alloy with Zn addition exhibits significantly higher yield strength and elongation compared to the alloy without Zn addition, mainly attributed to the strengthening effects of the LPSO and g0 phases.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Guangli Bi, Hongsheng Man, Jing Jiang, Yuandong Li, Tijun Chen, Xiaoru Zhang, Daqing Fang, Xiangdong Ding
Summary: The effects of Zn addition on the microstructure and mechanical properties of Mg-Y-Co-W alloy were investigated. The replacement of Co with Zn improved the strength and ductility of the alloy, resulting in refined grains and precipitation strengthening from different phases.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Metallurgy & Metallurgical Engineering
Wujun Yin, Fabien Briffod, Takayuki Shiraiwa, Manabu Enoki
Summary: The high elastic modulus and deformation kinks of the long period stacking ordered (LPSO) phase in Mg-Zn-Y alloys significantly enhance the tensile yield strength, with a slight detriment or benefit to the ductility. Extrusion processing improves both strength and ductility through recrystallization of Mg grains. The activation of different plastic deformation mechanisms depends on the volume fraction and relative size of Mg and LPSO phases.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Nanoscience & Nanotechnology
Xiaodong Yang, Xiaojie Zhou, Shilun Yu, Jian Zhang, Xianzheng Lu, Xiaomin Chen, Liwei Lu, Weiying Huang, Yaru Liu
Summary: The tensile behavior of extruded and peak-aged Mg-5Gd-3Y-xZn-0.5Zr alloys was investigated in terms of microstructural evolution, deformation modes, and mechanical properties at temperatures ranging from -100℃ to 300℃. The study found that the Zn content affected the distribution of intragranular and interdendritic phases, which in turn influenced the mechanical properties of the alloys. Additionally, the deformation modes during tensile testing were influenced by factors such as testing temperature, grain orientation, and LPSO morphology.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Zhiyu Chang, Qingchen Deng, Qiao Lan, Jian Feng, Daquan Li, Baoliang Liu, Yujuan Wu, Liming Peng, Wenjiang Ding
Summary: This study characterized and analyzed the microstructure and mechanical properties of Mg alloy castings prepared by rheo-diecasting and compared them with conventional diecasting. The solution-treated rheo-diecast alloy showed a significant improvement in elongation but a decrease in room-temperature tensile mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Shirong Zhang, Jonghyun Kim, Fengxue Wang, Kaikai Kang, Heng Xue, Xianhua Chen, Fusheng Pan
Summary: The microstructures and mechanical properties of Mg96Y2Cu2 and Mg96Y2Cu1Ni1 alloys were studied, and it was found that the LPSO phases in these alloys significantly improved the mechanical properties. The study results suggest that the volume fraction and morphology of LPSO phases are the main factors affecting the mechanical properties.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Shirong Zhang, Jonghyun Kim, Fengxue Wang, Kaikai Kang, Heng Xue, Xianhua Chen, Fusheng Pan
Summary: This study investigated the microstructures and mechanical properties of four different compositions of Mg alloys, finding that the addition of nickel improves mechanical properties while cobalt leads to poorer performance. The volume fraction and morphology of LPSO phases were identified as key factors affecting mechanical properties.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Amir Hossein Asadi, Parastoo Mahmoud Kalayeh, Hamed Mirzadeh, Mehdi Malekan, Massoud Emamy
Summary: In this study, the microstructures, mechanical properties during tensile deformation, and precipitation kinetics of Mg95.5Y3Zn1.5 and Mg95.5Y3Ni1.5 magnesium alloys were compared. The investigation revealed that the peak aging treatment led to the formation of lamellar 14H-LPSO phase in Mg95.5Y3Zn1.5 alloy and bMODIFIER LETTER PRIME-Mg7Y particles in Mg95.5Y3Ni1.5 alloy, resulting in improved ultimate tensile strength and total elongation. The analysis of formation kinetics indicated that the activation energy for phase transformation was different for the two alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Jonghyun Kim, Hongxin Liao, Xiang Ou, Zhaobin Zhang, Kaikai Kang, Taekyung Lee, Fusheng Pan
Summary: This study investigates the microstructures and mechanical properties of Mg-1Gd-1Y-xZn alloys (x = 0.2, 0.4, 0.6, and 0.8). The formation of long-period stacking-ordered (LPSO) and beta phases in the as-cast alloys is observed. The volume fraction of LPSO phase increases with higher Zn content, while that of beta phase decreases. Homogenization dissolves the beta phase into the Mg matrix but has no significant effect on the volume fraction of LPSO phases. Increasing Zn content slightly reduces grain size and enhances texture. The Mg-1Gd-1Y-0.2Zn alloy shows excellent mechanical properties at room temperature due to its high density of fine LPSO phases and reinforcement capacity. Additionally, the low volume fraction of LPSO phases in this alloy suppresses yield asymmetry.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Gaolong Zhang, Xiaolong Niu, Ruopeng Lu
Summary: The effects of different heat treatment processes and the addition of Mn on the morphology and damping properties of LPSO phase in Mg-4.9Zn-8.9Y-xMn alloys were investigated. The results showed that heat treatment temperature had a significant influence on the morphology of LPSO phase. The addition of Mn could divide the bulk LPSO into smaller parts, resulting in dispersed LPSO phases. Overall, heat treatment and Mn addition can affect the mechanical and damping properties of the alloy, with heat treatment improving damping properties and Mn improving mechanical properties without significantly reducing damping.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Chemistry, Physical
Guoqin Wu, Zhaocan Li, Jianmin Yu, Hongbing Hu, Yali Duan, Beibei Dong, Zhimin Zhang
Summary: The texture evolution mechanism of Mg-13.1Gd-3.9Y-2Zn-0.4Zr (wt%) alloys during reciprocating upsetting extrusion and subsequent heat treatment was investigated. The influence of deformation passes on texture weakening and deformation mechanism was discussed. The results showed that the basal texture intensity decreased with increased deformation passes and significantly decreased after T6 heat treatment. The anisotropy of the alloys was maintained after T5 treatment and eliminated after T6 treatment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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
Jianxin Zhou, Xiaojun Luo, Hong Yang, Bin Jiang, Wenlong Xie, Zhihua Dong, Jiangfeng Song, Junyao Xu, Guangsheng Huang, Dingfei Zhang, Fusheng Pan
Summary: The microstructural features of GWZ1352 alloys can be tailored by altering the cooling rates. Lower cooling rates result in an increased number and decreased spacing of lamellar long period stacking ordered (LPSO) phase. The excellent high temperature mechanical properties of the furnace-cooling (FE) alloy are mainly attributed to the abundant lamellar LPSO phase.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Sandra Cabeza, Pablo Perez Zubiaur, Gerardo Garces, Carmen Andrade, Paloma Adeva
Article
Metallurgy & Metallurgical Engineering
Klaudia Horvath Fekete, Daria Drozdenko, Jan Capek, Kristian Mathis, Domonkos Tolnai, Andreas Stark, Gerardo Garces, Patrik Dobron
JOURNAL OF MAGNESIUM AND ALLOYS
(2020)
Article
Metallurgy & Metallurgical Engineering
J. Medina, G. Garces, P. Perez, A. Stark, N. Schell, P. Adeva
JOURNAL OF MAGNESIUM AND ALLOYS
(2020)
Article
Materials Science, Multidisciplinary
D. Sornin, U. Ehrnsten, N. Mozzani, J. Rantala, M. Walter, A. Hobt, J. Aktaa, E. Onorbe, M. Hernandez-Mayoral, A. Ulbricht, S. Gicquel, L. Frank, Y. de Carlan
Summary: The study presents novel results on the ODS creep properties obtained from a round robin of inner gas pressure creep testing conducted by four European teams. The ODS steel tubes show a typical failure by leakage under inner gas pressure, without evidence of tertiary creep stage. The technique of inner gas pressure creep testing demonstrates remarkable consistency among different laboratories and proves to be efficient for ODS steel cladding tube qualification.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
G. Garces, J. Medina, P. Perez, A. Stark, H. K. Lim, S. Kim, N. Shell, P. Adeva
Summary: This study evaluates the influence of microstructure and processing parameters on the mechanical behavior of extruded Mg-Y-2x-Zn-x alloys containing the long-period stacking order (LPSO) phase. The volume fraction of dynamically recrystallized alpha-Mg grains increases with the volume fraction of the LPSO phase and processing stress.
Article
Materials Science, Multidisciplinary
Andreas Ulbricht, Mercedes Hernandez-Mayoral, Elvira Onorbe, Auriane Etienne, Bertrand Radiguet, Eric Hirschmann, Andreas Wagner, Hieronymus Hein, Frank Bergner
Summary: This study provides a detailed understanding of the irradiation-induced nanofeatures in reactor pressure vessel steels and identifies the dominant factors contributing to the increase in Vickers hardness. The results suggest that under high flux conditions, smaller nanoscale solute atom clusters and sub-nanoscale vacancy clusters are formed, leading to moderate effects on hardening.
Article
Materials Science, Multidisciplinary
Ulises Martin, Jacob Ress, Pablo Perez, Paloma Adeva, David M. Bastidas
Summary: The corrosion performance of a new developed high-entropy alloy (HEA) was studied, and it was found to have good corrosion resistance under neutral and acidic pH conditions.
Article
Nuclear Science & Technology
Elvira Onorbe, Mercedes Hernandez-Mayora, Rebeca Hernandez, Marta Serrano
Summary: This study investigates the thermal stability of a 9Cr-1Mo ferritic/martensitic steel before and after thermomechanical treatment. The results show that the material after thermomechanical treatment has a more stable microstructure compared to the as received material.
NUCLEAR MATERIALS AND ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Pablo Perez, Judit Medina, Maria Fernanda Vega, Gerardo Garces, Paloma Adeva
Summary: The effect of thermos-mechanical processing and thermal treatments on the microstructure of a single phase fcc-based Al5Co15Cr30Fe25Ni25 high entropy alloy is evaluated. Different routes of thermo-mechanical processing (forging, cold rolling, warm rolling, hot rolling) were followed and the microstructural evolution of highly deformed cold rolled sheets with annealing temperature was analyzed. The results show that recrystallization of the microstructure begins at 600 degrees C, leading to higher hardness in the thermo-mechanically treated alloys compared to the annealed alloys.
Article
Materials Science, Multidisciplinary
Gerardo Garces, Pablo Perez, Judit Medina, Rafael Barea, Adrian Gomez, Javier Garcia, Paloma Adeva
Summary: The Mg-2%Nd alloy, after thermal treatment and quenching at 520 degrees C, shows plastic instabilities at intermediate temperatures between 100 and 300 degrees C due to dynamic strain aging caused by the presence of neodymium atoms. The competition between the precipitation of Mg-Nd particles and the DSA phenomenon during compression tests depends on the test temperature. Below 200 degrees C, the formation of neodymium-rich precipitates is slow and the interaction is insignificant, resulting in a normal behavior of the DSA. However, at temperatures above 200 degrees C, the faster formation of neodymium-rich precipitates and the decrease of neodymium in solid solution lead to an inverted evolution of the critical strain with temperature.
Article
Engineering, Multidisciplinary
G. Ruiz-Menendez, C. Andrade, G. Carro-Sevillano, C. Pena, P. Adeva, J. Medina, R. Fernandez
Summary: In this study, rebars extracted from a reinforced concrete viaduct were investigated to understand their failure mode. It was found that the rebars broke in a tilted pattern without reduction in diameter. Hardness measurements on the cross section of the rebars revealed that the failure mode was either tensile plastic collapse or fatigue. The presence of corrugations on the rebars caused stress concentration, explaining the observed tilted appearance of the fracture surface. Further studies should be conducted to explore the influence of different corrugation patterns on the fracture appearance.
RESULTS IN ENGINEERING
(2022)
