Results 71 to 80 of about 225,646 (268)

A Comprehensive Review of Adsorbents for Rare Earth Separation: Design, Synthesis, Adsorption Performance, and Mechanisms

Rare Metals, EarlyView.
ABSTRACT Rare earth elements (REEs) play an irreplaceable role in modern technology and industry. However, due to the highly similar physicochemical properties among REEs, their separation remains a significant challenge. Additionally, REEs often exist in low‐concentration solutions, making efficient REE recovery an urgent task.
Miao‐Miao Huang, Jun Tan, Liu‐Yin Xia, Kai Han, Hong‐Yan Cai, Xin Ma, Shuai Wang   +6 more
wiley   +1 more source

Strength of nanoporous Ni-based superalloy membranes

Journal of Physics: Conference Series, 2010
Nanoporous Ni-based superalloy membranes are a new material class. They are fabricated from the two phase γ/γ' base material by thermomechanical processing, followed by selective phase extraction. Compared to other metallic membrane materials, they stand out due to an extremely regular and fine channel-like porosity on the nanoscale.
J Rösler, O Näth
openaire   +1 more source

Mechanical Properties of Powder Injection Molded Ni-Based Superalloys [PDF]

Advanced Materials Research, 2011
This paper describes the microstructural and mechanical properties of powder injection moulded (PIM) Ni based superalloys. Ni-based superalloys were mixed with a polymeric binder (paraffin wax, carnauba wax, stearic acid and PP) and injection moulded as standard tensile bars. The critical powder loading for injection moulding were 62.5 vol.
Gulsoy, H. Ozkan, Ozbek, Sunullah, Gunay, Volkan, Baykara, Tarik   +3 more
openaire   +2 more sources

Fabrication‐Driven Oxidation Pathways in Y/Hf‐Modified High‐Entropy Alloys: From Elemental Segregation to Oxide Homogeneity

Rare Metals, EarlyView.
ABSTRACT This study elucidates the oxidation mechanisms governing Y/Hf‐doped AlCoCrFeNiTi high‐entropy alloys (HEAs) and reveals the pivotal role of fabrication processes in dictating high‐temperature oxidation behavior. We demonstrate that casting and spark plasma sintering (SPS) promote Y/Hf segregation, resulting in heterogeneous oxide formation and
Huaqing Yi, Jiapeng Zheng, Jiawen Zhang, Yi Yang, Binbin He, Wenjun Lu   +5 more
wiley   +1 more source

Novel in situ synthesized carbide reinforced Ni base composite for structural castings with high creep resistance

Materials & Design, 2019
Ni base superalloys for structural castings of aero engines demand higher service temperatures and lower costs while retaining their processing characteristics.
Wei Wang, Guoliang Zhu, Rui Wang, Donghong Wang, Weitao Pan, Wenzhe Zhou, Dafan Du, Anping Dong, Da Shu, Baode Sun   +9 more
doaj   +1 more source

Novel Non‐Equimolar High‐Entropy Zirconates With Superior Thermophysical Properties

Rare Metals, EarlyView.
ABSTRACT Rare‐earth zirconates (RE2Zr2O7) are promising candidates for topcoat materials in thermal barrier coatings (TBCs). However, their practical application in TBCs is limited by poor fracture toughness and low thermal expansion coefficient (TEC).
Taoyi Lu, Zhiqin Wen, Suzhen Kang, Li Tang, Jiyuan Huang, Gaoxiang Wei, Rui Zhang, Yuhong Zhao   +7 more
wiley   +1 more source

On Crystal Mosaicity in Single Crystal Ni-Based Superalloys [PDF]

Crystals, 2019
In the present work, we investigate the evolution of mosaicity during seeded Bridgman processing of technical Ni-based single crystal superalloys (SXs). For this purpose, we combine solidification experiments performed at different withdrawal rates between 45 and 720 mm/h with advanced optical microscopy and quantitative image analysis.
Philipp Hallensleben, Felicitas Scholz, Pascal Thome, Helge Schaar, Ingo Steinbach, Gunther Eggeler, Jan Frenzel   +6 more
openaire   +3 more sources

Coalescence‐Ripening Mechanism of γ′−Ni3(Al, Ti) During Long‐Term/High‐Temperature Operation of Ni‐Based Superalloy Discs

Rare Metals, EarlyView.
ABSTRACT The evolution of the γ′−Ni3(Al, Ti) phase in superalloys is governed by a coupled coalescence‐ripening mechanism driven by elemental diffusion. In this study, thermal exposure experiments were performed at 750°C and 800°C for durations ranging from 100 to 20,000 h.
Zhaotian Wang, Yongquan Ning, Bingchao Xie, Xiaoguang Fan, Mei Zhan, Mingwang Fu   +5 more
wiley   +1 more source

Regulating TGO Nucleation and Growth of MCrAlX Coatings via Femtosecond Laser Remelting: The Role of Reactive Elements in the Oxidation Resistance

Rare Metals, EarlyView.
ABSTRACT MCrAlX coatings are widely used as bond coats in thermal barrier coating systems to protect turbine blades from high‐temperature oxidation. However, their oxidation resistance is often restricted by uncontrolled microstructures, surface roughness, and aggregation of reactive elements (REs). In this study, high‐repetition‐rate femtosecond laser
Wei Qian, Xiangcheng Li, Yinqun Hua, Xiaofeng Zhang, Yong Feng, Xiaonan Wang, Szymon Tofil, Jie Cai   +7 more
wiley   +1 more source

Effect of welding defects on fatigue behavior of Ni-base superalloy GH4065A

Journal of Aeronautical Materials
The spot-welding defects of highly alloyed Ni-base superalloy GH4065A were investigated by using SEM and EBSD analysis methods. Effects of the welding defects on fatigue life and fracture behavior were studied by comparing thin plate samples with a ...
LI Linhan, ZHANG Ji, TIAN Chenggang, YANG Shanjie, SHEN Zhongmin, ZHANG Wenyun, ZHANG Beijiang   +6 more
doaj   +1 more source