Article
Materials Science, Multidisciplinary
Zhe Wu, Si Jia Wang, Yang Zhang, Yu Long Liu, Li Jian Huang, Rui Zhi Wu
Summary: The laser cutting experiment of AZ31B magnesium alloy was conducted to investigate the effects of laser power on surface roughness and kerf width. Measurements were carried out using an ultra-depth-of-field three-dimensional microscope and scanning electron microscope to evaluate the kerf width, surface roughness, kerf taper, slag height, and element distribution. The results showed that the cutting surface exhibited layering with three major areas: top area, scour area, and strip area. Changes in the areas of these regions affected the roughness of the cutting surface. Additionally, the kerf width at the straight line and the kerf width at the sharp corner increased with higher laser power, while the kerf taper increased and the height of hanging slag peaked at a laser power of 900W.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Sibo Wang, Chunyan Yan, Zhengjia Gu
Summary: In this study, laser-arc hybrid welding of AZ31B magnesium alloy was performed, and the effects of welding parameters on weld formation, microstructure evolution and mechanical property were investigated. The results showed that laser-arc hybrid welding can effectively prevent undercut defects and improve the stability of the arc. The optimized welding parameters were determined, and the welds exhibited good quality and high mechanical strength.
Article
Optics
Mingjun Zhang, Jie Wu, Cong Mao, Bo Cheng, Hossain M. D. Shakhawat, Heqing Li, Kaiming Wang, Jian Zhang, Yongle Hu, Zhuming Bi
Summary: The study demonstrates that using power modulation in laser welding can improve weld quality, reduce underfill issues on the top surface, and enhance the microstructure and mechanical properties of the welds.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Huijing Zhang, Baosong Guo, Wenbo Du, Xinyue Cong, Chao Chen
Summary: This study proposes a new welding electrical signal waveform for improving the welding quality of magnesium alloy TIG. It is named as AC/DC mixed tungsten inert gas arc (MIX-TIG) welding. Through investigations on weld formation, microstructure, and mechanical properties of the welded joints, it is found that complete penetration of welded joints can be obtained when welding current is within the range of 90A~110A. There is no significant difference in the geometrical parameters of the weld cross-section between AC-TIG and MIX-TIG. The microstructure of the fusion zone consists of α-Mg matrix and β-Mg17Al12 phase. The average grain size and β phase number in MIX-TIG are smaller compared to AC-TIG. The microhardness of AC-TIG fusion zone is slightly higher than that of MIX-TIG due to the increased β phase number. The strain of AC-TIG welded joint is reduced by approximately 24% compared to MIX-TIG welded joint.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Luiz Carneiro, Duke Culbertson, Qin Yu, Yanyao Jiang
Summary: The study experimentally characterized the mechanical response and microstructure evolution of a rolled AZ31B magnesium alloy using companion thin-walled tubular specimens under free-end monotonic torsion. It was found that the shear stress-shear strain response exhibits a sigmodal shape with four distinctive stages of strain hardening, involving basal slips, tension twinning, and compressing twinning. The formation of twin-twin boundaries (TTBs) and the collective hardening effects by twin boundary (TB) and TTB contribute to a unique rise in strain hardening rate in certain stages. Further observations of different types of twins and their interactions provide insights into the deformation mechanisms during different stages of the process.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yu-Jui Lin, Chao-Sung Lin
Summary: The corrosion behavior and corrosion rate of friction stir welded AZ31B magnesium alloy and 6N01 aluminum alloy dissimilar joints were studied using real-time imaging, potentiodynamic polarization, EIS, and hydrogen evolution tests. The corrosion rate was found to increase in the order of Al base metal < Mg base metal < stirred zone. The galvanic coupling of the Mg phase to other phases enhanced the corrosion of both base metals, and intense corrosion at BM-AZ31B elevated the interfacial pH due to water reduction on the cathodic particles of BM-6N01.
Article
Biophysics
S. Thanka Rajan, Mitun Das, A. Arockiarajan
Summary: The study demonstrates that the development of niobium and niobium oxide thin films on Mg alloys using sputtering technique can improve the corrosion resistance and biocompatibility of the alloys. The thin-film coated Mg alloys exhibited good corrosion resistance and cell proliferation capability.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Metallurgy & Metallurgical Engineering
Sameehan S. Joshi, Shreyash M. Patil, Sangram Mazumder, Shashank Sharma, Daniel A. Riley, Shelden Dowden, Rajarshi Banerjee, Narendra B. Dahotre
Summary: This study investigated the additive friction stir deposition of AZ31B magnesium alloy using MELD (R) technology. The results showed that the additively produced samples had a refined grain structure, strengthened basal texture, and slightly higher hardness compared to the feed material. This research provides a pathway for solid state additive manufacturing of magnesium suitable for structural applications.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Engineering, Manufacturing
Huijing Zhang, Chao Chen
Summary: The self-developed pulsed power ultrasonic wave assisted gas metal arc welding (PU-GMAW) device has shown significant enhancements in weld penetration and melting area compared to conventional GMAW, leading to an increase in weld metal hardness. The mechanism behind these improvements is attributed to the increase in welding heat input.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Materials Science, Multidisciplinary
Luiz Carneiro, Duke Culbertson, Xianyun Zhu, Qin Yu, Yanyao Jiang
Summary: Stress-strain responses and twinning characteristics were studied for a rolled AZ31B magnesium alloy under three different stress states. Tension twinning is extensively induced in twinning-favorable directions, with different twin variants activated in each stress state. The increase in hardening rate is attributed to the effect of twin boundaries and twinning texture-induced slip activities, with higher tension twin volume fractions observed under tension and compression states.
MATERIALS CHARACTERIZATION
(2021)
Article
Optics
Huiming Li, Dianwu Zhou, Xinyu Wang
Summary: Oscillating laser welding was used to join AZ31B magnesium alloy and DP590 dual-phase steel in an overlap Mg-on-steel configuration with Sn foil. Numerical simulation was used to analyze the energy distribution, temperature, and flow fields within the molten pool. The effect of the oscillating laser beam on the microstructure and mechanical properties of the joints was investigated. By rotating the laser beam with the assistance of Sn foil, a sound Mg/steel dissimilar joint was obtained, and defects such as spatter and collapse were avoided. In the case of circular oscillation mode, the shear force of the joint was significantly improved compared to the non-oscillation mode. The uniformity of laser energy distribution was improved, and the joint width increased due to the oscillation of the laser beam.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Hao Wu, Ke Xi, Yan Huang, Zena Zheng, Zhenghua Wu, Ruolin Liu, Chilou Zhou, Yao Xu, Hao Du, Yansheng Yin
Summary: This study develops an epoxy composite coating containing sericite nanosheets on the AZ31B Mg alloy using a one-step electrophoretic deposition method to improve corrosion resistance. The results show that this composite coating exhibits high corrosion resistance and significantly enhances the long-term anti-corrosion performance of the epoxy coating. This work provides new insights into the design of lamellar filler/epoxy coatings with superior anticorrosion performance and shows promise in the corrosion protection of magnesium alloys.
Article
Engineering, Mechanical
Yan Wang, Chuhan Wu, Liangchi Zhang, Peilei Qu, Shanqing Li, Zhenglian Jiang
Summary: The study investigates the effect of thermal oxidation and chemical compositions of oxides on the wear of AZ31B magnesium alloy. Higher temperatures cause thickening of the oxide film layer, emergence of oxide nodules, loss of protective capability, and increased wear rate. The minimum wear rate is found at 200 degrees C while the maximum is at 400 degrees C.
Article
Engineering, Manufacturing
Ankit Thakur, Varun Sharma, Shailendra Singh Bhadauria
Summary: The mechanical and metallurgical behavior of double-sided friction stir welded joints of 6 mm thick magnesium alloy plates under different tool tilt angles were investigated. It was found that the joint efficiency, grain refinement, and hardness were higher in the 2-degree tilt angle joint, leading to significant improvements in elongation in various regions of the weld compared to the 0-degree joint. The SEM characterization showed ductile and shear fracture modes with larger dimpled morphology and tearing ridges in the macro and micro tensile specimens of the 2-degree tilt angle joint.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Karol Frydrych, Tomasz Libura, Zbigniew Kowalewski, Michal Maj, Katarzyna Kowalczyk-Gajewska
Summary: The paper presents an experimental and numerical study on the deformation mechanisms in the AZ31B magnesium alloy sheet under cyclic in-plane tensile-compressive deformation, focusing on the influence of slip, twinning, and detwinning on mechanical response and texture evolution. A crystal plasticity model accounting for twinning and detwinning is formulated and identified using an evolutionary algorithm, with discussion on the predicted activity of deformation mechanisms in relation to experimental data.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
