Article
Engineering, Mechanical
Hai Rong, Ping Hu, Liang Ying, Wenbin Hou, Minghua Dai
Summary: The theory of unified visco-plastic damage constitutive equations has been used to model the thermal flow behavior and damage evolution of materials, but the anisotropic properties were often ignored. A novel damage correction formula was proposed in this paper, integrated with a continuum damage model to establish an improved anisotropic damage constitutive model. Material constants were determined based on experimental data for accurate prediction of forming limit curves and hot forming simulations of AA7075 alloy.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Hailiang Yang, Xiao Wang, Peng Ni, Zhewen Li, Huixia Liu
Summary: This study conducted uniaxial tensile experiments and developed a constitutive model to investigate the formability of LA103Z magnesium alloy under high strain rates, providing theoretical support for laser shock forming.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Yusuke Matsuoka, Mingzhe Bian, Xinsheng Huang, Yuhki Tsukada, Toshiyuki Koyama, Yasumasa Chino
Summary: The relationship between Zn content and room temperature mechanical properties of dilute Mg-xZn-0.1Ca alloy sheets was investigated. Increasing the Zn content resulted in a significant improvement in the formability. The relative activity of deformation modes did not show apparent differences between different Zn contents. The appearance of tilted basal poles and the development of TD-split texture contributed to the enhanced formability. The efficient scheme for parameter fitting required for VPSC simulation was proposed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jun Xu, Wenjun Liu, Bin Jiang, Huabao Yang, Xintao Li, Yuehua Kang, Nan Zhou, Weiwen Zhang, Kaihong Zheng, Fusheng Pan
Summary: The transverse gradient extrusion (TGE) process was proposed for fabricating Mg-3Al-1Zn (AZ31) alloy sheet with tailored strong basal texture. A novel texture was formed in the TGE sheet, tilted about 65 degrees from normal direction (ND) to extrusion direction (ED), and elongated along the transverse direction (TD). The TGE sheet exhibited a large Erichsen value compared to the conventional extruded (CE) sheet, thanks to its unique texture and uniform fined grain structure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Mirae Lim, Hanbi Byun, Yunjun Song, Jungsoo Park, Jeong Kim
Summary: Due to environmental regulations, vehicle weight reduction technology has become a key factor influencing market competitiveness in the automobile industry. Electromagnetic forming (EMF) technology has been proposed as a method to improve the low formability of aluminum alloys. Through finite element analysis, it was confirmed that the EMF process showed significant deformation at the die shoulder and center, and EMF has the advantage of having a smaller amount of sheet inflow but lower forming accuracy compared to the drawing process.
Article
Automation & Control Systems
Rui Zhang, Zhong-Jin Wang
Summary: The potential of sheet forming using flexible-dies is presented, and a new method using magnetorheological elastomer (MRE) is proposed. The performance behavior of MRE can be adjusted under different magnetic fields to increase the forming limits of the sheet metal.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
B. Q. Shi, L. Y. Zhao, X. L. Shang, B. H. Nie, D. C. Chen, C. Q. Li, Y. Q. Cheng
Summary: By subjecting the as-cast billets of ZWK100 alloy to final-pass heavy reduction rolling (FHRR) at different reduction rates, it was found that reductions above 50% favored shear banding formation and led to uniform grain structures with symmetrical 'oblique-line split' texture, resulting in excellent elongation and formability. The formation of the 'oblique-line split' texture was mainly correlated with the preferred growth tendency of grains with special boundaries, contributing to the high stretch formability of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Fei Feng, Jianjun Li, Liang Huang, Yunjun Zhang, Shijing Cao, Rongchuang Chen, Suo Fan
Summary: Direct pulse current electromagnetic forming (DPCEMF) is a high-speed forming method that combines pulsed current heating and electromagnetic forming to address forming difficulties in low conductivity and high strength materials. Experimental validation of the DPCEMF process was conducted, and a process window for corrugation forming of Ti-6Al-4V titanium alloy was proposed.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Metallurgy & Metallurgical Engineering
Ayush Morchhale, Anand Badrish, Nitin Kotkunde, Swadesh Kumar Singh, Navneet Khanna, Ambuj Saxena, Chetan Nikhare
Summary: The stretch forming and deep-drawing processes were conducted at temperatures of 300 and 673 K to determine the safe forming and fracture limits of IN625 alloy. The experimentally obtained strain-based fracture forming limit diagram was transformed into a stress-based diagram to remove excess dependency. Various damage models were calibrated for prediction, with the Oh model showing the best accuracy. Despite the experimentally obtained fracture limits being used for numerical analysis, none of the considered models predicted fracture strains over the entire stress triaxiality range. The deep drawing process helped determine safe zones and achieve a drawing ratio of 2 at 673 K under lubrication conditions. Numerical predictions using the Hill 1948 anisotropic yielding function were found to be within an acceptable range of error.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Metallurgy & Metallurgical Engineering
Dong Hee Lee, Ye Jin Kim, Sang-Hoon Kim, Byoung Gi Moon, Sung Hyuk Park
Summary: This study systematically analyzes the extrusion behavior, microstructure, and tensile properties of an AZXWMM91100 alloy with high corrosion resistance, ignition resistance, and extrudability. The extrusion limit diagram is established to provide a safe processing zone, and it is found that the materials within this zone have good surface quality and tensile ductility.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Automation & Control Systems
Davide Campanella, Gianluca Buffa, Ernesto Lo Valvo, Livan Fratini
Summary: A numerical approach was proposed in this research to determine an analytical expression of material formability in hot incremental forming processes. The Johnson-Cook material model was used and validated through experimental measurements, establishing an analytical expression of the fracture forming limit.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Jong Un Lee, Gyo Myeong Lee, Sung Hyuk Park
Summary: Precompression and subsequent annealing treatment can improve the bending formability of the Mg-9Al-1Zn-0.3Mn-0.9Ca-0.6Y alloy. The PCAed material exhibits higher bending formability due to the promoted twinning and slip behaviors.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Chemistry, Physical
T. Nakata, T. Matsuno, R. Oki, S. Kamado
Summary: The effect of micro-texture on the tensile properties and room-temperature stretch formability of Mg-Al-Zn alloy sheet was studied. The introduction of micro-texture through solution treatment, hot-rolling, and post-annealing increased the fraction of a unique texture component, which improved the limiting dome height without compromising the strength due to the high activity of tensile twinning and minimal change in the Schmid factor for basal slips. This finding highlights the importance of micro-texture designing for the development of high strength-formability synergy in magnesium alloy sheets.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Emanuel A. Nicoletti, Analia Roatta, Luciano Ponzellini Marinelli, Javier W. Signorelli, Diego J. Celentano
Summary: The effect of bilinear strain paths on the forming limit curves (FLCs) of sheet metals was analyzed using both experimental measurements and numerical simulations. The MK-VPSC-SRE model was validated and the limitations of simulating texture development, flow stress, and forming limit curves were discussed.
Review
Materials Science, Multidisciplinary
Alan A. Luo, Renhai Shi, Jiashi Miao, Thomas Avey
Summary: This paper introduces the latest magnesium alloy developed and evaluated by the United States Automotive Materials Partnership (USAMP) in collaboration with university partners, which offers excellent room temperature formability for automotive applications.