Article
Chemistry, Physical
Mozhgan Gholami-Kermanshahi, Yu-Yan Wu, Guenther Lange, Shih-Hang Chang
Summary: This study investigates the damping properties of Cu-Al-Mn shape memory alloys with different compositions and the effects of adding quaternary alloying elements Ag and Nb on their microstructure, martensitic transformation behavior, and damping capacity. The addition of Ag or Nb reduced the grain size and increased the hardness of Cu-12Al-5Mn alloys, but it also decreased the damping capacity and temperature of the internal friction peak. Adding Ag reduced the damping capacity due to a decrease in transformed martensite, while adding Nb caused the AlNb3 phase to precipitate and slightly decreased the damping capacity. Among the Ag and Nb-doped Cu-12Al-5Mn alloys, Cu-12Al-5Mn-1Nb exhibited the highest hardness and damping capacity, with a tan delta exceeding 0.01 at around 50 ℃.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Lovro Liveric, Tamara Holjevac Grguric, Vilko Mandic, Robert Chulist
Summary: The influence of manganese content on the formation of martensite structure and the final properties of a quaternary Cu-Al-Mn-Ag shape memory alloy was investigated. It was found that the addition of silver contributes to the formation of the martensite structure. The alloy with 7%wt. of manganese forms stable martensite even in the as-cast state.
Article
Physics, Applied
P. Czaja, M. J. Szczerba, E. Villa, F. Villa, V Chernenko
Summary: Intermartensitic transformations between 10, 14, and 2M martensitic phases induced by uniaxial compression and tension were investigated in a Ni50.3Mn28.7Ga21.0 single crystal. The obtained stress-temperature phase diagrams show satisfactory agreement with the Clausius-Clapeyron relationship. These results are important for the development of theory and practical applications in magnetic shape memory alloys.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Kenneth H. Eckelmeyer, Gerard M. Ludtka, Gail Mackiewicz-Ludtka, Lloyd R. Chapman, A. D. Romig
Summary: The effect of Ti content on phase transformations, microstructures, and mechanical properties of U-Ti alloys are described. Higher cooling rates are required with increasing Ti content. Full quenching results in diffusionless transformation of gamma-phase to supersaturated variants of alpha-phase. The quenching method leads to different microstructures and mechanical properties.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Mingzhu Dang, Honghao Xiang, Jikang Li, Chao Cai, Qingsong Wei
Summary: A copper-based shape memory alloy Cu-11.85Al-3.2Mn-0.1Ti with desirable superelasticity and shape memory effect was successfully printed by laser powder bed fusion (LPBF) technique. The printed alloy exhibited a microstructure composed of full beta(1)' martensite with a high density of stacking faults and twin crystals. Under temperature stimulation, the printed samples showed remarkable superelasticity and shape memory effect, demonstrating reliable shape recovery ability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Guobo Pang, Xuejun Jin
Summary: The crystal structures and microstructures of the parent and martensite phases of Au7Cu5Al4 alloy were studied using X-ray diffraction and transmission electron microscopy. The observations revealed the presence of pre-martensitic tweed striations with modulated structures in the austenitic phase, as well as non-modulated and partially modulated martensite variants in the slowly cooled alloy. However, quenching the alloy into liquid nitrogen resulted in the formation of perfectly periodic modulated martensite plates. The crystal structures of martensite variants were primarily identified as body-centered tetragonal structures, although the presence of modulation affected the tetragonality ratio.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Ayano Toriyabe, Wan-Ting Chiu, Akira Umise, Masaki Tahara, Kenji Goto, Hiroyasu Kanetaka, Takao Hanawa, Hideki Hosoda
Summary: The introduction of Ag into the Au-Cu-Al alloy successfully achieved ductile phase toughening, solving the issue of embrittlement, and shape recovery was also observed during unloading. The improvement in strengthening and enhancement of ductility was attributed to the insertion of the ductile alpha 1 phase into the brittle beta/beta grain boundaries, as revealed by microstructure observations, cyclic tensile tests, and fracture surface observations.
Article
Crystallography
Parinaz Seifollahzadeh, Morteza Alizadeh, Abel Szabo, Jeno Gubicza, Moustafa El-Tahawy
Summary: Ultrafine-grained Cu/Al/Ag composites were prepared using an accumulative roll bonding technique and Cu-Al-Ag alloys were obtained through heat treatment. The study investigated the effects of different Ag contents and heat treatment temperatures on the structural evolution. The results showed that heat treatment formed a fine-grained hard martensite phase, which increased the microhardness and strength of the samples.
Article
Nanoscience & Nanotechnology
Qiang Lu, Jingjing Hu, Tong Yang, Yucheng Wang, Yao Xiao, Xingwu Li, Namin Xiao, Jinsan Wang, Zhixiu Wang, Hai Li, Liya Li, Kai Li, Yong Du
Summary: In heat-resistant Al-Cu-Mg-Ag alloys, the presence of AgMg segregation layer on omega phase ensures its high thermal stability. It has been proved that an increase in Ag content can promote the precipitation of omega, even in an Al-Cu-Mg-Ag-Si alloy with a Mg/Si mass ratio around 1.7. The key point is to obtain an Ag/Mgexcess atomic ratio greater than 1 in the supersaturated solid solution. Although the fine precipitation of omega increases the total volume fraction of precipitates and yield strength, their quick coarsening at high temperature leads to a more pronounced strength loss.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
H. Mei, J. C. Liu, F. Chen, Y. X. Tong, M. Zarinejad
Summary: NiTiTa shape memory alloys (SMAs) have higher corrosion resistance and better X-ray visibility compared to NiTi SMAs. This study investigates the martensitic transformation, microstructure, and shape memory effect (SME) of Ni49.6Ti45.4Ta5 SMA. After optimal thermomechanical treatment, the maximum recovery strain reaches up to 5.32% under a pre-strain of 7%.
Article
Nanoscience & Nanotechnology
M. R. Gazizov, A. N. Belyakov, R. Holmestad, M. Yu. Gazizova, V. S. Krasnikov, P. A. Bezborodova, R. O. Kaibyshev
Summary: The coarsening behavior of strengthening particles in peak-aged Al-Cu-Mg-Ag alloy during creep at 150 degrees C and 165 degrees C has been studied. It was found that the average thickness and diameter of {111}Al omega plates strongly depend on creep time and less on applied stress levels and plastic strain during creep. The volume fraction of omega particles increased during long-term creep and exceeded the value after peak aging. S-phase and theta'-phase independently nucleate and intergrow to form precipitate complexes. The size of the complex particles is sensitive to the plastic strain level achieved at different applied stresses during creep.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Yanqing Zhang, Shuiyuan Yang, Laisen Wang, Shaobin Pan, Jinbin Zhang, Xingjun Liu, Cuiping Wang
Summary: This paper reports the superelasticity and excellent cycle stability of boron-microalloyed Co-V-Al-Fe shape memory alloy. The addition of boron results in refined grain size and improved mechanical and superelastic properties in the alloy.
Article
Chemistry, Physical
Shenghui Xie, Jianxin Zhao, Song Li, Jiaxin Su
Summary: The production cost of amorphous alloys is significantly increased due to the requirement of extremely stringent atmospheric conditions. This study found that the addition of 0.15 at% O to Zr52Cu23Ni10.5Al14.5 amorphous alloy severely deteriorates its strength and plasticity due to the formation of micrometer scale crystalline phases. However, the combined addition of 1 at% Ag and 0.15 at% O can substantially improve its fracture strength and plasticity by enhancing the uniform distribution and refining the size of nanocrystalline phases. These findings provide important insights for the industrial production and large-scale commercial applications of amorphous alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Alice Perrin, Sumit Bahl, Donovan N. Leonard, Richard Michi, Kevin Sisco, Alex Plotkowski, Amit Shyam, Ryan Dehoff, Dongwon Shin, Ying Yang
Summary: This study compares AM and conventionally cast Al-Cu-Ce alloys and finds that despite the refined microstructure of the AM alloys, the formation and stability of phases are consistent with the cast alloys. The study also resolves inconsistencies in the previous descriptions of the Al-Cu-Ce alloy phase diagram and adds Al8Cu3Ce as an equilibrium phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Hongyu Chen, Junming Gou, Wentao Jia, Xin Song, Tianyu Ma
Summary: This study investigates the origin of appealing hard magnetic properties in non-equiatomic magnetic high-entropy alloys through detailed microstructural and chemical analysis. The results show that the as-cast alloy has a hierarchically heterogeneous microstructure with nano-arrays enriched or depleted with ferromagnetic element. The aspect ratio and elemental concentration of the nano-arrays can be manipulated by magnetic annealing, significantly enhancing the coercivity.
Article
Materials Science, Multidisciplinary
Jakov Batelic, Vedrana Spada, Lovro Liveric, Sanja Martinez
Summary: The study analyzed corrosion deposits to determine the main reason for leakage and flow damping in the thermal power plant, identifying iron-oxidizing bacteria as the primary cause of intense corrosion. The absence of protective carbonate scales was also found to contribute to the severe corrosion of the pipeline steel.
MATERIALI IN TEHNOLOGIJE
(2021)
Article
Materials Science, Multidisciplinary
Suncana Smokvina Hanza, Lovro Stic, Lovro Liveric, Vedrana Spada
Summary: This study investigated the corrosion behavior of 42CrMo4 steel after different hardening processes, including quenching and tempering, double quenching and tempering, and austempering. The results showed that the applied heat treatment processes increased the corrosion resistance of the steel compared to normalized steel, while double quenching and tempering and austempering did not significantly change the corrosion resistance.
MATERIALI IN TEHNOLOGIJE
(2021)
Article
Materials Science, Multidisciplinary
Lovro Liveric, Dario Iljkic, Zoran Jurkovic, Niksa Catipovic, Pawel Nuckowski, Oktawian Bialas
Summary: The corrosion behavior of 42CrMo4 low-alloy steel was studied after different annealing processes. The mechanical and microstructure properties of the samples were characterized, and the corrosion resistance was evaluated. It was found that the soft annealed samples exhibited higher corrosion rate compared to the spheroidized and fully annealed samples. Full annealing also improved the corrosion resistance significantly.
MATERIALI IN TEHNOLOGIJE
(2023)
Article
Engineering, Multidisciplinary
Suncana Smokvina Hanza, Ladislav Vrsalovic, Lovro Stic, Lovro Liveric
Summary: The study found that Al-Si alloy parts produced by high-pressure die casting and gravity die casting processes exhibit good corrosion resistance, which is related to their microstructure and chemical composition. The corrosion rates are low, but differences in the elecfrochemical behavior of different alloys were observed.
ENGINEERING REVIEW
(2021)
Article
Social Sciences, Interdisciplinary
Tomislav Babic, Marko Krsulja, Maja Supukovic
Summary: This study investigates the fatigue in professional soldiers caused by active physical activity and endurance limits, and how training, preparedness, and acquired work skills contribute to the human body as a large working machine. Field tests showed differences in workload conditions and heart rates, aiding in determining rest spots and safety in training conditions.
ZBORNIK VELEUCILISTA U RIJECI-JOURNAL OF THE POLYTECHNICS OF RIJEKA
(2021)
Article
Social Sciences, Interdisciplinary
Melani Masatovic, Elvis Ciliga, Marko Krsulja
ZBORNIK VELEUCILISTA U RIJECI-JOURNAL OF THE POLYTECHNICS OF RIJEKA
(2017)
Article
Social Sciences, Interdisciplinary
Kruno Kauric, Damir Koscic, Marko Krsulja
ZBORNIK VELEUCILISTA U RIJECI-JOURNAL OF THE POLYTECHNICS OF RIJEKA
(2016)
Article
Social Sciences, Interdisciplinary
Marko Krsulja, Dario Bognolo
ZBORNIK VELEUCILISTA U RIJECI-JOURNAL OF THE POLYTECHNICS OF RIJEKA
(2014)
Article
Social Sciences, Interdisciplinary
Tatjana Gregorovic, Dario Bognolo, Marko Krsulja
ZBORNIK VELEUCILISTA U RIJECI-JOURNAL OF THE POLYTECHNICS OF RIJEKA
(2014)
Article
Engineering, Multidisciplinary
Miroslav Plancak, Zlatan Car, Marko Krsulja, Dragisa Vilotic, Igor Kacmarcik, Dejan Movrin
TEHNICKI VJESNIK-TECHNICAL GAZETTE
(2012)
Article
Metallurgy & Metallurgical Engineering
M. Krsulja, Z. Car, H. Radelja
Article
Engineering, Multidisciplinary
Miroslav Plancak, Zlatan Car, Dragisa Vilotic, Dejan Movrin, Marko Krsulja
ENGINEERING REVIEW
(2011)
