Article
Chemistry, Physical
Jayshri Dumbre, Shravan K. Kairy, Elaf Anber, Timothy Langan, Mitra L. Taheri, Thomas Dorin, Nick Birbilis
Summary: Scandium (Sc) containing Al-Si model alloys were heat-treated to form (Al,Si)(3)Sc phase at 350 degrees C and V-phase (AlSc2Si2) at above 450 degrees C. The hardening of the alloys was attributed to the coherent nanoscale (Al,Si)(3)Sc precipitates, while significant softening was observed due to the formation of coarse V-phase. The V-phase was found to have a rod morphology and six new orientation relationships with the alpha-Al matrix were determined using TEM.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Nadine Eissmann, Uwe Muehle, Uwe Gaitzsch, Gunnar Walther, Thomas Weissgaerber, Bernd Kieback
Summary: The effect of titanium addition beyond the solubility limit was investigated to demonstrate the precipitation hardening possibility of the Cantor alloy CoCrFeMnNi. Following appropriate heat treatment, a significant increase in hardness was detected due to nanometer-sized precipitates identified through TEM analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Alok Singh, Takanobu Hiroto, Hiroyuki Watanabe, Naoko Ikeo, Toshiji Mukai, Koichi Tsuchiya
Summary: Addition of Al to equiatomic high entropy alloy promotes formation of BCC phase and sigma phase. Straining by caliber rolling induces morphological changes related to planar faults, where sigma phase nucleates first on the matrix faults followed by formation of B2 phase driven by elemental concentration changes. This study provides insights into the formation mechanisms of different phases in the alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Yinzhong Shen, Jianxing Wo
Summary: M3C2 (Cr3C2 type) carbide, a Cr-rich alloy phase, was observed in an 11%Cr ferritic/martensitic steel after normalization and tempering through transmission electron microscopy. The carbide showed irregular block, branch crystal-like, and needle-like morphologies, with sizes ranging from 100 to 350nm in diameter and 200-470nm in length. Its approximate chemical formula was (Cr0.55Fe0.4W0.05)3C2. The formation mechanism of the carbide during tempering was discussed.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Daniel Irmer, Charbel Moussa, Lisa T. Belkacemi, Mohamed Sennour, Alan Vaissiere, Vladimir A. Esin
Summary: The effect of cold rolling on the precipitation kinetics of the hardening phase was investigated in AA2024. Cold rolling induced faster coarsening kinetics and nucleation/growth of the S-phase, resulting in lower hardness of pre-deformed AA2024-T8 compared to the undeformed state. Cold rolling also led to a fine and homogeneous distribution of hardening precipitates and a different aspect ratio of S-phase precipitates. These findings may be applicable to other precipitation-hardened alloys as well.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
M. R. Gazizov, A. O. Boev, C. D. Marioara, R. Holmestad, M. Yu Gazizova, R. O. Kaibyshev
Summary: The study analyzed the coherent edge interface structures of thin {111}(Al) Omega plates in a peak-aged Al-Cu-Mg-Ag alloy using atomic-resolution STEM, finding that these edge interfaces can tilt from their orthogonal orientations to the broad plate surfaces. The edge interface tilts are correlated with shear component orientations along the broad plate surfaces and vary with plate thicknesses, while Cu atoms tend to occupy specific atomic sites near the edge interfaces in the Al matrix region.
MATERIALS CHARACTERIZATION
(2022)
Article
Metallurgy & Metallurgical Engineering
Kai Guan, Daisuke Egusa, Eiji Abe, Jinghuai Zhang, Xin Qiu, Qiang Yang, Jian Meng
Summary: The effect of Gd content on the microstructure and tensile properties of as-cast Mg-Sm-Zn-Zr alloy was investigated. The addition of Gd inhibited the segregation behavior of Zn in the Mg3Sm phase and improved the tensile yield stress of the alloy. Gd-modified alloys exhibited significant age-hardening effect, attributed to the high-volume fraction and high density nano-scale precipitates.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
M. R. Gazizov, A. O. Boev, C. D. Marioara, R. Holmestad, D. A. Aksyonov, M. Yu Gazizova, R. O. Kaibyshev
Summary: The atomic structure of omega plates forming on {111}Al planes in an Al-Cu-Mg-Ag alloy has been investigated, revealing volumetric and structural incompatibilities with the Al matrix. Different thicknesses of omega plates were studied under peak-aged conditions, showing shear components and misfit strains affecting plate interfaces and the thickening of omega precipitates.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
M. Matsuda, K. Kiwaki, H. Akamine, M. Nishida
Summary: Microstructure and crystallography of martensite variants in Ti-Pd-Hf alloy were investigated using electron microscopy. The study found that the martensitic transformation temperature decreases with increasing Hf substitution in the Ti50-xPd50Hfx alloy. Martensitic transformation was not observed in the Ti25Pd50Hf25 and Ti10Pd50Hf40 alloys, but plate-like habit-plane variants consisting of major and minor correspondence variants were observed in the Ti40Pd50Hf10, Ti35Pd50Hf15, and Ti30Pd50Hf20 alloys. The martensitic transformation temperature in the Ti50-xPd50Hfx alloy was significantly decreased by nanosized H-phase particles and solute atom clustering.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Aslan Ahadi, Amir Sabet Ghorabaei, Hassan Shirazi, Mahmoud Nili-Ahmadabadi
Summary: In this study, an unprecedented thermal stability is reported in bulk coarse-grained Ti54Ni3.7Cu123Co2 after aging at 600 degrees C for 1 h. A thermomechanical processing route is proposed to achieve a uniform nanocrystalline microstructure with embedded Ti2Cu precipitates, leading to improved superelastic cyclic stability.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Fabian Kochta, Annett Gebert, Uta Kuehn, Steffen Oswald, Thomas Gemming, Christoph Leyens, Julia Kristin Hufenbach
Summary: The LPBF process results in a significantly refined microstructure and more uniform distribution of principal phases for the high-strength Fe85Cr4Mo8V2C1 tool steel, leading to reduced corrosion activity in more aggressive environments. Additionally, LPBF samples exhibit a wave-like corrosion pattern due to microstructural features related to melt tracks.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
E. A. Naumova, S. O. Rogachev, R. Sundeev
Summary: High-pressure torsion (HPT) was used to study the influence on phase composition, structure, and properties of Al-18% Ca alloy containing Al4Ca intermetallic. Results show that even after 5 turns of HPT, the additional hardening does not exceed 30-40 HV. The Al4Ca intermetallic undergoes noticeable plastic deformation with subgrain sizes predominantly in the range of 10-50 nm.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Yunhe Zheng, Laure Bourgeois, Jian-Feng Nie
Summary: This study investigated the structure of precipitates in Mg-Zn-Al alloys, revealing new structural features and proposing that the rod-shaped precipitates can be described by tiling of different shapes.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Katarzyna Stan-Glowinska, Amelia Zieba, Lukasz Rogal
Summary: This study investigates the microstructures and mechanical properties of two conventionally cast Al-Mg-Zn base alloys during aging process. The results show that the Ga-bearing alloy exhibits higher hardness and tensile strength, which can be attributed to its higher precipitate number density. In addition, the structure of formed precipitates differs between the two alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Mikihiro Sakata, Kota Kadoi, Hiroshige Inoue
Summary: This study demonstrates differences in high temperature embrittlement behavior between the base and weld metals of a 22% Cr duplex stainless steel, with the weld metal showing a more pronounced decrease in impact toughness and more significant hardening of ferrite in each layer. The accelerated spinodal decomposition of ferrite in the weld metal, particularly due to higher Ni content, resulted in faster embrittlement compared to the base metal.
MATERIALS TODAY COMMUNICATIONS
(2021)
