Article
Nanoscience & Nanotechnology
Dhrubjyoti Baruah, S. Arjun Sreedhar, Saurabh Kumar Gupta, Satyam Suwas, R. Narasimhan
Summary: This study investigates the effect of temperature on the mixed-mode fracture response of a rolled AZ31 Mg alloy. Experimental results show that the fracture toughness Jc enhances by a factor of about 3.5, irrespective of mode mixity over the temperature range studied. The change in fracture mechanism from brittle cracking to ductile void growth and coalescence is observed as the temperature increases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Arjun Sreedhar, Suraj Ravindran, Gyan Shankar, S. Suwas, R. Narasimhan
Summary: Static and dynamic fracture experiments on rolled AZ31 Mg alloy revealed different fracture mechanisms under different loading conditions, with an increase in twin density and associated texture under dynamic loading, leading to a significant increase in fracture toughness at high loading rates.
Article
Materials Science, Multidisciplinary
Kwangtae Son, Michael E. Kassner, Tae-Kyu Lee, Ji-Woon Lee
Summary: This study investigates the effects of Mg and temperature on the cryogenic impact toughness of Al-Mg alloys. The results show that higher temperatures improve the impact toughness in all Al-Mg alloys. However, beyond a Mg content of 6 wt%, the impact toughness decreases with increasing Mg. AA5083 exhibits the lowest impact toughness due to the presence of coarse inclusions.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Jing Xu, Bo Guan, Xiaojun Zhao, Rui Fu, Qiang Hu, Chaoqiang Liu
Summary: This study investigates the impact of strain rate on the twinning process and mechanical behavior during compression of a rolled AZ31 Mg plate. The results show that the yield strength is insensitive to strain rates below 0.05 s-1, but increases at a higher strain rate of 2500 s-1. Interestingly, the TD-compressed sample exhibits a larger yield plateau at a strain rate of 2500 s-1 due to increased activation of {101 over bar 2} twins. The twinning process is highly dependent on the strain rate, with higher strain rates promoting twin nucleation and leading to a higher twin boundary density.
Article
Nanoscience & Nanotechnology
Z. K. Ji, X. G. Qiao, W. T. Sun, L. Yuan, F. G. Cong, G. J. Wang, M. Y. Zheng
Summary: The effects of bimodal microstructure on the tensile properties and fracture toughness of Mg-9Gd-4Y-0.5Zr alloys were investigated. The results showed that the bimodal grain structure exhibited better yield strength and plane strain fracture toughness compared to the fully dynamic recrystallized (DRXed) microstructure. The bimodal grain structure had a higher tensile strength due to hetero-deformation induced (HDI) strengthening effect and strong basal texture. In addition, it had a stronger strain hardening capacity and larger hardened region, leading to improved fracture toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Jing Xu, Yanshuo Peng, Bo Guan, Yunchang Xin, Adrien Chapuis, Guangjie Huang, Qing Liu
Summary: Dual-phase Mg-Li alloys with different rolling paths were studied to investigate the effect of rolling path on microstructure, texture and mechanical anisotropy. The lamellar alpha+beta structures remained after ED-rolling and subsequent annealing, while disappeared after TD-rolling. The texture of beta phase was hardly affected by the rolling path. Annealing only reduced the maximum intensity of texture without changing the type of texture. VPSC simulations revealed that the activated deformation modes and alpha/beta phase boundaries played important roles in texture evolution. There was an obvious mechanical anisotropy after ED-rolling, which disappeared after TD-rolling.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
B. Q. Shi, Y. Z. Wang, X. L. Shang, L. Y. Zhao, C. Q. Li, D. C. Chen, B. H. Nie, R. S. Chen, W. Ke
Summary: This study investigates the microstructure evolution and texture development of a RE-containing Mg alloy during hot rolling, aiming to understand the formation of shear bands and their correlation with macro-texture characteristics. The results reveal the roles of different types of twins/variants and dislocation mechanisms in shear band formation, and provide insights into the influence of these factors on the texture development.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
C. Ha, J. Bohlen, X. Zhou, H-G Brokmeier, K. U. Kainer, N. Schell, D. Letzig, S. Yi
Summary: This study investigated the differences in texture development and active deformation mechanisms during sheet rolling for binary Mg-RE or Mg-Ca alloys compared to their ternary counterparts with Zn. The analyses were based on in-situ synchrotron experiments and electron backscatter diffraction measurements, revealing direct experimental evidence of texture development and active deformation mechanisms. Higher activations of nonbasal a c+a 1010 a a c+a a slip in the Zn-containing ternary alloys were confirmed through EBSD misorientation analysis.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Mozhgan Shokri, Abbas Zarei-Hanzaki, Hamid Reza Abedi, Jae Hyung Cho
Summary: The study investigated the correlation between microstructure/texture evolutions and high temperature flow behavior in Mg alloy containing long period stacking order (LPSO) phases. The annealing treatment effectively strengthened the alloy and decreased ductility, with blocky LPSO assisting dynamic recrystallization and lamellar LPSO increasing alloy strength. The findings suggest that microstructure and texture evolution play a significant role in the high-temperature behavior of the Mg alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Biaobiao Yang, Jun Wang, Yunping Li, Matthew Barnett, Javier LLorca
Summary: A dual-textured Mg-6.5 Zn alloy with limited yield asymmetry is studied. The deformation mechanisms responsible for the behavior are analyzed and it is found that compressive deformation is accommodated by basal slip and extension twinning, while tensile deformation promotes basal and nonbasal slip. The contribution of rotated grains leads to similar values of the yield strength in tension and compression.
Article
Nanoscience & Nanotechnology
Fengxiang Zhang, Lijing Zheng, Fangfang Wang, Hu Zhang
Summary: The microstructural and mechanical properties of Ni55Ti45 alloy and Hf-modified Ni55Ti45-xHfx alloys were studied. Hf addition suppressed certain phases and promoted the formation of HfO2 particles. The alloy with 3% Hf content exhibited the best combination of fracture toughness and tensile strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Elaheh Maleki, Farzad Shahri, Masoud Emamy
Summary: The study found that adding 0.1 wt% Ca significantly enhanced the ultimate tensile strength and elongation of the as-cast alloy. The size of DRXed grains decreased with the increase of Ca, and the best result was obtained for the Mg-5Zn-0.1Ca sample, with an ultimate tensile strength of 351 MPa and an elongation percentage of 24% for the extruded alloy.
METALS AND MATERIALS INTERNATIONAL
(2021)
Review
Materials Science, Multidisciplinary
Mahesh Panchal, K. R. Ravi, Lalit Kaushik, Rajesh Khatirkar, Shi-Hoon Choi, Jaiveer Singh
Summary: Magnesium alloys have gained great interest as the lightest structural metallic materials with high specific strength and stiffness. However, their poor formability at room temperature is a limitation for their structural applications. Various techniques, including microalloying, severe plastic deformation, thermomechanical processing, and pre-twinning/stretching, have been proposed to alter the crystallographic texture in magnesium alloys.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Pramote Thirathipviwat, Sega Nozawa, Moe Furusawa, Yusuke Onuki, Makoto Hasegawa, Katsushi Matsumoto, Shigeo Sato
Summary: The texture evolution and dislocation density in Al-Mg alloys during uniaxial tensile deformation were investigated using neutron diffraction experiment. The (001) and (111) duplex texture were observed in Al-Mg alloys under low strain rate (1.33 x 10-5 s-1). The differences in pole density at (001) and (111) orientations depended on the content of Mg addition. The (001) deformation texture was developed from initial (001) cube texture, especially in alloys with low Mg addition and pure Al sample. In alloys with high Mg addition, the development of (111) texture was clearly presented. An increase in Mg addition induced larger dislocation density during deformation in correlation with the formation of (111) deformation texture.
Article
Materials Science, Multidisciplinary
Saurabh Gairola, Rengaswamy Jayaganthan
Summary: In this study, the tensile and fracture behavior of UFG Al 6061 alloy was simulated using XFEM, showing that UFG Al alloy exhibits higher tensile strength and fracture toughness compared to their bulk solution treated counterparts. For CR Al alloys, a decrease in thickness leads to an increase in stress intensity factor and a decrease in the J integral, while for ARB Al alloys, an increase in strength and ductility was observed with an increase in the number of cycles. XFEM simulation results also indicated an increase in both stress intensity factor and J integral with an increase in the number of cycles for ARB processed Al alloys.
Article
Physics, Condensed Matter
Sanyukta Ghosh, Gyan Shankar, Anirudha Karati, Gerda Rogl, Peter Rogl, Ernst Bauer, B. S. Murty, Satyam Suwas, Ramesh Chandra Mallik
Summary: The combination of Ba-filling the voids and GaSb nanophase incorporation in Co4Sb12 matrix resulted in improved thermoelectric properties, mainly by reducing lattice thermal conductivity and enhancing scattering effect to enhance zT.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Arjun Sreedhar, Suraj Ravindran, Gyan Shankar, S. Suwas, R. Narasimhan
Summary: Static and dynamic fracture experiments on rolled AZ31 Mg alloy revealed different fracture mechanisms under different loading conditions, with an increase in twin density and associated texture under dynamic loading, leading to a significant increase in fracture toughness at high loading rates.
Article
Materials Science, Multidisciplinary
Nitish Bibhanshu, Gyan Shankar, Satyam Suwas
Summary: Hot deformation and softening response of titanium aluminide Ti-48Al-2V-0.2B were investigated, with microstructural changes observed at different strain rates and temperatures. Deformation in different phase fields led to various mechanisms, such as dynamic recrystallization and cavitation along grain boundaries at certain temperatures. These findings provide insights into the softening behavior of the alloy under different deformation conditions.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
B. Aashranth, Gyan Shankar, M. Arvinth Davinci, Dipti Samantaray, Utpal Borah, Satyam Suwas
Summary: The study found that the softening mechanisms in P91 martensitic steel during thermo-mechanical processing are mainly influenced by the interaction between microstructural strain, texture, and phase transformation, and the softening characteristics vary with the processing parameters.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Deepak Kumar, Gyan Shankar, K. G. Prashanth, Satyam Suwas
Summary: Selective laser melting is widely used for manufacturing austenitic stainless steel (316L) due to its inherent advantages. Studies have shown that mechanical properties can be adjusted by controlling scanning strategies, and the evolution of microstructure and crystallographic texture is influenced by hatch style variations.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Madhusmita Behera, Ajit Panigrahi, Matthias Bonisch, Gyan Shankar, Pratima Kumari Mishra
Summary: A near-equiatomic TiTaNbMoZr refractory high entropy alloy (RHEA) was prepared by vacuum arc melting, and its structural stability and thermal expansion were investigated. The alloy exhibits structural stability up to 1173K and thermal stability up to 1000K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
B. Aashranth, Gyan Shankar, Dipti Samantaray, Satyam Suwas
Summary: The dynamic transformation of austenite to ferrite in a 9%Cr alloy steel is investigated in this study. The study reveals the essential characteristics of the transformation, its driving force, and the influencing factors. It is found that stress-driven displacive transformation occurs, and the transformation can be controlled by strain rate.
Article
Materials Science, Multidisciplinary
Gyan Shankar, Vivek Kumar Singh, Aditya Chepuri, Balasubramian Vengatesan, Satyam Suwas
Summary: Spheroidization is a common technique used to improve the formability and machinability of materials. In the case of 22MnB5 steel, a combination of deformation levels and annealing times was employed to optimize the spheroidization process, determining that the best processing parameter was 20% cold rolling reduction followed by 20 hours of annealing.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Aman Gupta, Gyan Shankar, Diksha Mahadule, Rajesh Kisni Khatirkar
Summary: The microstructure, texture, and mechanical properties of heat-treated two-phase titanium alloy samples were investigated. Different heating temperatures and cooling rates resulted in variations in the volume fraction of different phases and texture intensity. The formation of martensite during oil quenching increased microhardness, while grain coarsening during furnace cooling decreased microhardness. The heating temperature and cooling rate also significantly affected the modulus of elasticity.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Dhrubjyoti Baruah, K. V. Vaishakh, S. Arjun Sreedhar, Saurabh Kumar Gupta, Satyam Suwas, R. Narasimhan
Summary: The mixed-mode fracture behavior of fatigue pre-cracked AZ31 Mg alloy specimens is compared with pre-notched samples using optical imaging and digital image correlation. The fracture toughness is highest for mode I and decreases significantly with increasing mode II component. Additionally, the fracture toughness is 2-3 times higher for the pre-notched samples compared to the pre-cracked specimens. This is attributed to quasibrittle failure in the latter and a combination of ductile and brittle fracture surface features in the former. Profuse tensile twinning at the far-edge of the ligament is observed in the notched specimens, contributing to the toughness enhancement.
PHILOSOPHICAL MAGAZINE LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Dhrubjyoti Baruah, S. Arjun Sreedhar, Saurabh Kumar Gupta, Satyam Suwas, R. Narasimhan
Summary: This study investigates the effect of temperature on the mixed-mode fracture response of a rolled AZ31 Mg alloy. Experimental results show that the fracture toughness Jc enhances by a factor of about 3.5, irrespective of mode mixity over the temperature range studied. The change in fracture mechanism from brittle cracking to ductile void growth and coalescence is observed as the temperature increases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Gyan Shankar, Shuchi Sanandiya, Luis A. Barrales-Mora, Satyam Suwas
Summary: The effect of solid solution on the development of recrystallization microstructure and texture in FCC materials with unchanged SFE on alloying addition was examined. Pure Ni and Ni-Fe alloys with different Fe content were investigated. The addition of Fe led to differences in the recrystallization texture attributed to the highly heterogeneous deformed microstructure in the Ni-Fe system. Cu-oriented grains exhibited early recrystallization while deformed grains with orientation || ND showed slow recrystallization. The evolution of recrystallization texture and the role of different deformation features were investigated. Cellular automata simulation technique was used to simulate the recrystallization behavior and discuss experimental observations.
PHILOSOPHICAL MAGAZINE
(2023)
