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20 results on '"Nie, Qiao"'

8. Aging behavior of nano-SiCp reinforced AZ61 magnesium matrix composites

Author

Yan Hong, Hu Xiaowu, and Nie Qiao

Subjects
aging behavior, nano-SiCp, magnesium matrix composites, precipitates, Technology, Manufactures, TS1-2301
Abstract

The mechanical properties of magnesium matrix composties can be further improved by aging treatment. To study the aging behavior of SiC particles reinforced AZ61 magnesium matrix composites fabricated by ultrasonic method, an investigation has been undertaken by means of Vickers hardness measurement, scanning electron microscopy (SEM) and energy spectrum analyzing apparatus. The box-type heat treatment furnace was used in the study. The results showed that no discontinuous cellular precipitation is observed at the grain boundaries in the magnesium matrix of the composite while the Mg17Al12 preferentially precipitates in the matrix. The time to reach the peak hardness for AZ61 alloy or SiCp/AZ61 magnesium matrix composites is reduced with the increase of aging temperature. At the same temperature, the composite exhibit an accelerated aging manner but lower aging efficiency, compared with the unreinforced matrix alloy. The microhardness of the composite is higher than that of the unreinforced matrix alloy, because that the SiC particles distributes homogeneously in the matrix alloy under the ultrasonic processing condition.

Published
2011

10. Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Composite Made of Al-Si-Cu-Mg Aluminum Alloy Reinforced with SiC Particles

Author

Nie Qiao, Hong Yan, Jian-Long Liu, Ning Li, Zhi-Wei Wang, and Xin Li

Subjects
lcsh:TN1-997, Materials science, microstructure, Alloy, Composite number, chemistry.chemical_element, sic reinforced composite, 02 engineering and technology, mechanical properties, engineering.material, 01 natural sciences, Indentation hardness, Aluminium, Phase (matter), 0103 physical sciences, Ultimate tensile strength, al5si1cu0.5mg aluminum alloy, General Materials Science, Composite material, lcsh:Mining engineering. Metallurgy, Eutectic system, 010302 applied physics, heat treatment, Metals and Alloys, 021001 nanoscience & nanotechnology, Microstructure, chemistry, engineering, 0210 nano-technology
Abstract

In this paper, the effect of heat treatment (solution treatment and artificial aging) on the microstructure and properties of as-cast Al5Si1Cu0.5Mg aluminum alloy and its composite reinforced with 1.5 wt.% SiC particles was studied. The results showed that at 520 &deg, C the optimal solution time for the aluminum alloy and its composite is 9 h and 6 h, respectively. After solution treatment, the microstructure of these two materials consists of a uniform distribution of nearly spherical eutectic Si and skeletal &gamma, phase, furthermore, the composite eutectic Si phase is smaller and &gamma, phase is more dispersed. After artificial aging at 175 &deg, C for 6 h, the microstructure of the composite is more dispersed and finer than that of the aluminum alloy on the whole and Al2Cu is precipitated. After heat treatment, the microhardness, ultimate tensile strength, and elongation of the aluminum alloy and its composite are higher than those of the as-casts. At the same time, the morphology of tensile fracture surface changes very much from a large area of cleavage plane to a large number of dimples and the tearing ridges become thicker for both the aluminum alloy and its composite.

Published
2019

14. A novel method of multi-parameter measurements for the mouse retina in vivo using optical coherence tomography

Author

Nie Qiao, Ping Xie, Songtao Yuan, Xinghong Sun, Qinglu Song, Yidan Xu, Yuzhi Ding, and Qinghuai Liu

Subjects
medicine.medical_specialty, genetic structures, Nerve fiber layer, Retina, Cellular and Molecular Neuroscience, chemistry.chemical_compound, Mice, Optical coherence tomography, In vivo, Ophthalmology, medicine, Animals, medicine.diagnostic_test, business.industry, Retinal, medicine.disease, eye diseases, Sensory Systems, Mice, Inbred C57BL, medicine.anatomical_structure, chemistry, Optic nerve, Eye disorder, sense organs, business, Tomography, Optical Coherence, Retinopathy
Abstract

Because of the high similarity with human genotypes, mice are widely used in medical studies as experimental models, as well as in basic ophthalmological studies. Therefore, a mature and reliable measurement technique for the mouse retina is of great significance in studies of animal models of eye disorders. However, the current need to sacrifice animals for histological examinations at different time points interfereswith the ability to follow the disease process and to monitor therapeutic or side effects over time in the same individuals (Fischer et al., 2009). To obtain an improved observation of mice retinopathy and to reduce the sacrifice of mice, a novel measurement of the mouse retina in vivo is of highly practical significance. Optical coherence tomography (OCT), which was first described by Huang et al. (1991), allows for the noninvasive in vivo crosssectional imaging of ocular structures such as the retina, the retinal nerve fiber layer (RNFL), and the optic nerve head (Langenegger et al., 2011). OCT has evolved over the past two decades to become an important diagnostic tool in clinical and

Published
2013

20. Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Composite Made of Al-Si-Cu-Mg Aluminum Alloy Reinforced with SiC Particles.

Author

Li, Xin, Yan, Hong, Wang, Zhi-Wei, Li, Ning, Liu, Jian-Long, and Nie, Qiao

Subjects
ALUMINUM alloys, MECHANICAL heat treatment, EFFECT of heat treatment on microstructure, ALUMINUM composites, HEAT treatment, HYPEREUTECTIC alloys
Abstract

In this paper, the effect of heat treatment (solution treatment and artificial aging) on the microstructure and properties of as-cast Al5Si1Cu0.5Mg aluminum alloy and its composite reinforced with 1.5 wt.% SiC particles was studied. The results showed that at 520 °C the optimal solution time for the aluminum alloy and its composite is 9 h and 6 h, respectively. After solution treatment, the microstructure of these two materials consists of a uniform distribution of nearly spherical eutectic Si and skeletal γ phase, furthermore, the composite eutectic Si phase is smaller and γ phase is more dispersed. After artificial aging at 175 °C for 6 h, the microstructure of the composite is more dispersed and finer than that of the aluminum alloy on the whole and Al2Cu is precipitated. After heat treatment, the microhardness, ultimate tensile strength, and elongation of the aluminum alloy and its composite are higher than those of the as-casts. At the same time, the morphology of tensile fracture surface changes very much from a large area of cleavage plane to a large number of dimples and the tearing ridges become thicker for both the aluminum alloy and its composite. [ABSTRACT FROM AUTHOR]

Published
2019
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