Article
Metallurgy & Metallurgical Engineering
Xue-yi Guo, Zhao-wang Dong, Yang Xia, Pei-dong Liu, Han-ning Liu, Qing-hua Tian
Summary: A high-purity Ti-48Al-2Nb-2Cr alloy powder with low oxygen content and small particle size was successfully produced through reduction with magnesium and deoxidation with calcium. The phase and composition analysis showed that the product mainly consisted of gamma-TiAl and minor alpha(2)-Ti3Al phases, with Ti, Al, Cr, and Nb homogenously distributed in the powder.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Engineering, Mechanical
Junyuan Huang, Wei Zhang, Weiping Fang, Yaoyong Yi
Summary: Metal heat treatment can improve the performance of Ti6Al4V titanium alloy. In this study, Ti6Al4V titanium alloys are manufactured by heat-treating electron powder bed fusion, and the friction and wear properties of samples after different heat treatments are analyzed. The results show that HT3 has the smallest coefficient of friction but the largest amount of wear, while HT9 has a smaller amount of wear compared to HT3.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
D. Schimbaeck, J. Braun, G. Leichtfried, H. Clemens, S. Mayer
Summary: The study focused on investigating the processability and microstructural features of a powder-based TNM alloy with high Al content, as well as developing a tailored heat treatment to adjust the microstructure for balanced mechanical properties. The research showed that process parameters directly influence the microstructure, and post-processing heat treatment can tailor the microstructure to achieve specific properties.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Seong-June Youn, Young-Kyun Kim, Hyoung Seop Kim, Kee-Ahn Lee
Summary: The microstructure of the Ti4822 alloy, manufactured by EBM, was controlled through various heat treatment methods to improve mechanical properties at different temperatures. The results showed that Ti4822 with a thinner lamellar structure exhibited better mechanical properties and high ductility at room and high temperatures. Moreover, an increased fraction of the lamellar structure resulted in intensified yield stress anomaly and dynamic recrystallization.
Article
Engineering, Manufacturing
Haifei Lu, Weiwei Deng, Kaiyu Luo, Yuhua Chen, Jian Wang, Jinzhong Lu
Summary: An innovative hybrid additive manufacturing (HAM) technology combining laser shock peening without coating (LSPwC) and laser powder bed fusion (LPBF) has been proposed to tailor the microstructure of additively manufactured Ti6Al4V titanium alloys. The experimental results demonstrated that the martensitic laths in the LSPwC-treated region changed to equiaxed ultrafine grains under alternating mechanical and thermal effects. Consequently, compared with the LPBF specimen, the HAM specimen indicated a high ultimate tensile strength of -1303 MPa and an excellent elongation of -12.7 %.
ADDITIVE MANUFACTURING
(2023)
Article
Thermodynamics
Zhi-Jian Li, Zhi-Heng Xiao, Hai-Liang Zhang, Hong-Liang Dai, Wei-Feng Luo, Zheng-Wei Huang
Summary: A coupled thermo-mechanical model of titanium alloy parts in the powder bed fusion process is developed, taking into account the process-induced interfacial lack of fusion and pores. The equivalent temperature-dependent thermal properties of the parts with defects are calculated based on mixture theory, and the three-dimensional thermal, mechanical, and displacement fields are predicted using the differential quadrature method. The predicted results demonstrate the significant influence of process and geometry parameters on the temperature distribution, residual stress buildup, and deformation of the printed parts.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Manufacturing
S. L. Lu, Z. J. Zhang, R. Liu, Z. Qu, S. J. Li, X. H. Zhou, Q. Q. Duan, B. N. Zhang, X. M. Zhao, W. Zhao, P. Ramasamy, J. Eckert, Z. F. Zhang
Summary: The relationship between microstructure and mechanical properties in laser powder bed fusion (L-PBF) additively manufactured (AM) Ti-6Al-4 V alloy is complicated by the coupling effect of hierarchical microstructural features. In this study, the contributions of specific microstructures to strength and plasticity are clarified by controlling hierarchical microstructures through two-stage heat treatments. It is found that tensile strength is determined by the content of fine alpha' martensites and lath thickness, while plasticity is influenced by prior beta grain size and lath length. The simultaneous improvement of strength and plasticity can be achieved by increasing the alpha' fraction and refining prior beta grains and alpha laths. These findings provide guidance for optimizing the overall mechanical properties of L-PBF AM fabricated titanium components.
ADDITIVE MANUFACTURING
(2023)
Article
Crystallography
Ken Cho, Hirotaka Odo, Keisuke Okamoto, Hiroyuki Y. Yasuda, Hirotoyo Nakashima, Masao Takeyama, Takayoshi Nakano
Summary: The two-step heat treatment affects the microstructure and high-temperature tensile properties of beta-containing Ti-44Al-4Cr alloys by influencing the morphology of alpha(2)/gamma lamellar grains and beta/gamma cells. The volume fraction and lamellar spacing of the cells and lamellae increase with aging time, ultimately affecting the tensile properties of the alloys.
Article
Materials Science, Multidisciplinary
Chengren Dai, Jian Sun
Summary: The microstructure and room-temperature tensile property of the gamma-Ti-45Al-8.5Nb-(W, B, Y) alloy after different heat treatments were investigated. The results showed that different cooling methods could obtain different microstructures, and the alloy subjected to a two-step heat treatment showed improved tensile properties. The improved tensile properties were attributed to microstructure refinement and reduction of remnant B2 phase.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Avinash Hariharan, Phil Goldberg, Tobias Gustmann, Emad Maawad, Stefan Pilz, Frederic Schell, Tim Kunze, Christoph Zwahr, Annett Gebert
Summary: This study investigates the additive manufacturing of near beta-type Ti-13Nb-13Zr alloys using the LPBF process and explores the optimization of process parameters and post-processing strategies. The research achieves stable process and high part density, and demonstrates excellent mechanical and corrosion properties. The findings are of great significance for the development of personalized orthopedic implants.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Physical
Andreas Weisheit, Anupama Dutta, Silja Katharina Rittinghaus, Jyotsna Dutta Majumdar
Summary: This study focuses on understanding the microstructure and nano-mechanical properties of titanium carbide added titanium aluminide composites developed through laser additive manufacturing. The addition of TiC increases nanohardness, which varies with applied laser parameters, and attempts were made to derive the process parameters corresponding to a maximum improvement in nano-hardness. Adjusting the process parameters is crucial to achieving optimal performance in terms of microstructure and mechanical properties.
Article
Materials Science, Multidisciplinary
Rafael de Moura Nobre, Willy Ank de Morais, Matheus Tavares Vasques, Jhoan Guzman, Daniel Luiz Rodrigues Junior, Henrique Rodrigues Oliveira, Railson Bolsoni Falcao, Fernando Jose Gomes Landgraf
Summary: This study investigates the influence of laser power and scanning speed on microstructure and crystallographic texture formation of Nb-48Ti alloy fabricated using laser powder bed fusion process. Higher values of power and scanning speed favor an increase of near-cube-on-face texture and a reduction in Young's modulus.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Manufacturing
Wenlu Zhou, Chen Shen, Xueming Hua, Lin Wang, Yuelong Zhang, Fang Li, Jianwen Xin, Yuhan Ding
Summary: In recent years, there has been increasing interest in additive manufacturing of titanium aluminide. Element additions have been a concern in order to improve the microstructure and mechanical properties of additively manufactured titanium aluminide. This study successfully introduced vanadium into gamma-TiAl alloy using the twin-wire directed energy deposition-arc (TW-DED-arc) method, aiming to enhance the strength and plasticity of the deposited TiAl component. The research investigated the microstructure, chemical composition homogeneity, and mechanical properties of TW-DED-arc deposited Ti-48Al and Ti-48Al-2V alloys, and found that vanadium additions improved the properties of the alloy.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Physical
Guy Molenat, Benjamin Galy, Michael Musi, Louise Toualbi, Marc Thomas, Helmut Clemens, Jean-Philippe Monchoux, Alain Couret
Summary: Studies have shown that the TNM-TiAl alloy exhibits limited ductility at room temperature, with fracture surfaces of specimens showing cleavage facets along lamellar interfaces, which is related to the localized hardening behavior of the omega(o) phase within the beta(o) grains.
Article
Chemistry, Physical
Byungmin Ahn
Summary: Ti-6Al-4V alloy was prepared using selective laser melting (SLM) method and subjected to heat treatment in this study. The results showed that heat treated samples exhibited a reduction in defects, a change in morphology of the alpha'-martensite, a significant decrease in strength, but an improvement in elongation. An optimal combination of strength and elongation was found at 900°C.
Article
Chemistry, Physical
Z. Wang, K. G. Prashanth, A. K. Chaubey, L. Loeber, F. P. Schimansky, F. Pyczak, W. W. Zhang, S. Scudino, J. Eckert
JOURNAL OF ALLOYS AND COMPOUNDS
(2015)
Article
Chemistry, Physical
Florian Pyczak, Alexander Bauer, Mathias Goeken, Uwe Lorenz, Steffen Neumeier, Michael Oehring, Jonathan Paul, Norbert Schell, Andreas Schreyer, Andreas Stark, Felix Symanzik
JOURNAL OF ALLOYS AND COMPOUNDS
(2015)
Article
Materials Science, Multidisciplinary
Konda G. Prashanth, Sergio Scudino, Anil K. Chaubey, Lukas Loeber, Pei Wang, Hooyar Attar, Frank P. Schimansky, Florian Pyczak, Juergen Eckert
JOURNAL OF MATERIALS RESEARCH
(2016)
Article
Materials Science, Multidisciplinary
Marcus Willi Rackel, Andreas Stark, Heike Gabrisch, Norbert Schell, Andreas Schreyer, Florian Pyczak
Article
Nanoscience & Nanotechnology
M. Kolb, J. M. Wheeler, H. N. Mathur, S. Neumeier, S. Korte-Kerzel, F. Pyczak, J. Michler, M. Goeken
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2016)
Article
Materials Science, Multidisciplinary
A. Tchouaha Tankoua, A. Stark, M. W. Rackel, F. Pyczak, A. von Hehl
MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK
(2016)
Article
Metallurgy & Metallurgical Engineering
J. Soyama, O. M. Ferri, T. Ebel, K. U. Kainer
Article
Chemistry, Physical
J. D. H. Paul, M. Oehring, F. Appel, F. Pyczak
Article
Materials Science, Multidisciplinary
Juliano Soyama, Michael Oehring, Thomas Ebel, Karl Ulrich Kainer, Florian Pyczak
Article
Materials Science, Multidisciplinary
Xia Luo, Thomas Ebel, Florian Pyczak, Wolfgang Limberg, Yuanhua Lin
Article
Nanoscience & Nanotechnology
F. Iqbal, F. Pyczak, S. Neumeier, M. Goeken
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2017)
Article
Nanoscience & Nanotechnology
Yong Min Kim, Chamini Mendis, Taisuke Sasaski, Dietmar Letzig, Florian Pyczak, Kazuhiro Hono, Sangbong Yi
SCRIPTA MATERIALIA
(2017)
Article
Materials Science, Multidisciplinary
Zhida Liang, Mathias Goeken, Uwe Lorenz, Steffen Neumeier, Michael Oehring, Florian Pyczak, Andreas Stark, Li Wang
Summary: The addition of Si has a more pronounced effect on oxidation resistance compared to Cr in Co-9Al-9W based alloys at 900 degrees C. While 4 at.% Cr addition was insufficient to produce a protective layer, 2 at.% Si addition led to the formation of a dense, continuous Al2O3 scale. Thermodynamics and kinetics for Al2O3 layer formation were analyzed using a combination of CALPHAD and Wagner's theory.
Article
Materials Science, Multidisciplinary
Zhida Liang, Florian Pyczak, Andreas Stark, Ziyuan Rao, Steffen Neumeier, Mathias Goeken
Summary: A small amount of Cr alloying inhibits the oxidation of Co-9Al-9W-2Si alloy, prevents the formation of Al2O3 scale, and increases the diffusion rate of oxygen in the oxide layer, leading to the non-continuous merging of Al2O3 particles in the oxide layer.
Article
Chemistry, Physical
Daria Lazurenko, Victor V. Lozanov, Andreas Stark, Florian Pyczak, Alexey A. Ruktuev, Kemal Emurlaev, Lin Song, Ivan A. Bataev, Ivan Ivanov, Tatiana S. Ogneva, Anatoly A. Bataev
Summary: Ti-Al3Ti composites have attracted attention for their outstanding mechanical properties, but limited by the low ductility and fracture toughness of Al3Ti phase. This study discusses stabilizing the L1(2) structure of titanium trialuminide as a promising way to improve composite properties, with Zn and Ag found to be the most efficient stabilizers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)