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157 results on '"Zhai, Haimin"'

1. HVOF deposition characteristics and corrosion resistance of 316 stainless steel coating on magnesium alloy surface

Author

LI Xuqiang, LI Wensheng, ZHANG Zheyun, CUI Shuai, SHAO Lei, and ZHAI Haimin

Subjects
magnesium alloy, 316 stainless steel coating（ssc）, hvof, residual stress, corrosion resistance, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

The 316 stainless steel coatings with different thicknesses （SSC2， SSC4， SSC7， SSC10） were deposited on the magnesium alloy surface by using the HVOF method. The microstructures， deposition characteristics， residual stresses and immersion corrosion characteristics of the coating were investigated. The results reveal that due to the lower melting point and hardness of magnesium alloy， spray particles are prone to invade the substrate and melt its surface， causing particle escape or splashing， resulting in lower deposition efficiency； after depositing thinner coatings （SSC2 and SSC4）， the escape or splashing behavior of deposited particles reduces significantly， and the deposition efficiency increases； when the deposition thickness increases to SSC7 or above， the surface temperature of the deposition increases， particle splashing gradually increases， and the porosity and oxide content of the coating surface increase. Furthermore， as the coating thickness increases， the residual compressive stress of the coating decreases， the stress distribution becomes more uniform， and the number of penetrating pores in the coating decreases significantly， approaching zero. There are penetrating pores inside the SSC2 and SSC4 coatings， and the effective protection time is extremely short. The thick coatings （SSC7 and above） still have a protective effect after soaking in 3.5% （mass fraction） NaCl solution for 720 h.

Published
2024
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26. Research progress in control of microstructure and mechanical properties of in-situ bulk metallic glass composites

Author

ZHAI Haimin, MA Xu, YUAN Huayan, OU Mengjing, and LI Wensheng

Subjects
bulk metallic glass composites, microstructure regulation, preparative technique, mechanical property, shear band, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Metallic glasses (MGs) have a series of excellent mechanical, physical, chemical and other properties due to their unique short-range ordered and long-range disordered atomic structure characteristics, making them have great potential application value in the field of advanced metal structural materials. However, when the bulk metallic glass (BMG) is deformed under room temperature, the large amount of free volume formed by the shear transformation of the atomic clusters will evolve into a highly localized shear bands. The localized shear bands will undergo instability expansion due to the lack of media, which leads to the fact that BMGs are very prone to brittle fracture at room temperature. In particular, there is no plasticity during uniaxial tension. In order to overcome this shortcoming, the researchers proposed to introduce the micron-sized crystal phase into the glass matrix to suppress the instability expansion of the shear band, so that the in-situ dendritic toughened bulk metallic glass composite (BMGC) has obvious tensile plasticity, and the BMGC has attracted much attention from the material science community. In recent years, researchers have successively improved the plastic deformation ability of BMGC through composition design, preparation technology, heat treatment process and other methods, making BMGC be expected to move towards practical engineering applications. This article focuses on the key scientific issue of microstructure control of in-situ second-phase toughened BMGC, from the factors that affect the microstructure of BMGC (alloy composition design, preparation process parameters, microstructure construction, etc.) to the mechanism of the influence of microstructure on its room temperature mechanical properties, the research results were systematically summarized. In particular, the article focuses on the research progress in the field of in-situ second-phase toughened BMGC in the past 10 years in the field of microstructure regulation and the correlation between mechanical properties at room temperature. In addition, the current problems and challenges in the field of in-situ second-phase toughened BMGC were addressed. The prospects are expected to provide a theoretical reference for the design and preparation of high-strength and high-toughness in-situ second-phase toughened BMGC.

Published
2022
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