Results 181 to 190 of about 1,054 (210)

Long distance chemical gradient induced by surface nanocrystallization

Applied Materials Today, 2019
Abstract Natural structures are wonderful examples of what can be done with a fairly limited selection of resources. Natural structures have this feature due to their complex architecture, gradient chemical compositions and microstructure. Inspired by nature, many attempts have been made to manufacture man-made materials with similar gradients (e.g ...
Qingqing Sun, Rong Xu, Qingyou Han, Kejie Zhao, Ian McAdams, Wilson Xu   +5 more
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Effect of surface nanocrystallization on the corrosion behavior of Zircaloy-4

Science in China Series E: Technological Sciences, 2009
The contrastive corrosion experiments between surface nanocrystallined Zircaloy-4 and coarse-grained Zircaloy-4 under the condition of 673 K/10.3 MPa in pure water are carried out, and the microstructure of oxide films has been studied. The results indicate that the growth rate of oxide films formed on the nanocrystalline Zircaloy-4 is lower than that ...
YuTao Zhu, XiYan Zhang
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Simulation for surface self-nanocrystallization under shot peening

Acta Mechanica Sinica, 2003
Driven by high frequency and multi-directional shot peens, dislocations of various orientations proliferate into the metal, and accumulate in high density in the surface layer of a shallow depth. Migration, generation and annihilation of dislocations dictate the evolution of mobile dislocation density.
MA Xinling, Wang Wei, Yang Wei
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Effect of Surface Nanocrystallization Method on Fatigue Strength of TA2

Materials Science Forum, 2009
The enhancement of the fatigue strength is significant for the engineering applications of commercial pure titanium and its alloys. The paper investigated improvement of fatigue strength for commercial pure titanium by combined high-energy shot peening.
Ai Ling Wen, Rui Ming Ren, Sheng Wu Wang, Jun Yong Yang   +3 more
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Effect of Surface Nanocrystallization on Fatigue Behavior of Pure Titanium

Journal of Materials Engineering and Performance, 2015
The high-cycle fatigue behavior was investigated in pure titanium after surface nanocrystallization (SNC Ti). Compared with the coarse-grained titanium (CG Ti) samples, the SNC Ti samples exhibit an improved fatigue life. The SNC has a remarkable influence on the fatigue cracks initiation and growth of pure titanium.
Qi Wang, Qiaoyan Sun, Lin Xiao, Jun Sun
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Study on the Structure and Properties of Surface Nanocrystallized Zr-4

Advanced Materials Research, 2011
A nanostructured surface layer was obtained on the surface of Zr-4 by surface mechanical attrition treatment(SMAT). The structure and the properties of the SMAT sample were analyzed by means of the optical microscope, hardness and polarization curve testing.
Cong Hui Zhang, Da Li Liu, Xin Zhe Lan, Xi Cheng Zhao   +3 more
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Study on Surface Nanocrystallization of TiAl Alloys Induced by HEBMT

Applied Mechanics and Materials, 2012
Utilize the high-energy ball milling techniques (HEBMT) to get a certain thickness of the nanocrystalline layer in gradient structure on TiAl-based alloys surface, while using X-ray diffraction and electron microscopy techniques to analyze the microscopic structure of the surface and study its variation along the depth direction.
Tian Hang Yao, Wei Zhang, Yong Liu, Ming Yang Zhang, Di Ni Wang   +4 more
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Effect of Annealing on the Properties of Surface Nanocrystallized CP-Ti

Materials Science Forum, 2011
Vacuum annealing was carried out for the SMAT treated CP-Ti sample at different temperatures. The structure and the properties of the SMAT sample before and after the annealing were analyzed by means of the optical microscope, hardness and polarization curve testing.
Cong Hui Zhang, Xiao Mei He, Xin Zhe Lan, Xi Cheng Zhao   +3 more
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Thermal stability of nanocrystalline layers fabricated by surface nanocrystallization

Applied Surface Science, 2010
Abstract A nanocrystalline layer with ultrafine grains (about 30–40 nm) on the surface of 7050 aluminum alloy was fabricated by a new technique called High Pressure Shot Peening (HPSP) which is the combination of common Shot Peening equipment with a pressurizing vessel.
Yong-jin Mai, Xiao-hua Jie, Li-li Liu, Neng Yu, Xiang-xin Zheng   +4 more
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Nanocrystallization and Surface Magnetic Structure of Ferromagnetic Ribbons and Microwires

2009
The nano-crystals nucleation and growth mechanism in the bulk and at the surface of alloys under the application of a magnetic field or a constant tensile stress during thermal treatment are studied. Clear differences have been found in the nano-crystals growth mechanisms and nano-crystallization of the bulk and surface of the ribbons depending on the ...
A. Chizhik, A. Zhukov, V. Zhukova, C. Garcia, J. M. Blanco, J. J. del Val, L. Fernandez, N. Iturriza, J. Gonzalez   +8 more
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