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Jiuzhou Zhao - One of the best experts on this subject based on the ideXlab platform.
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Effect of Micro-Alloying element La on corrosion behavior of Al-Mg-Si alloys
Corrosion Science, 2021Co-Authors: Qiuju Zheng, Hongxiang Jiang, Lili Zhang, Jiuzhou ZhaoAbstract:Abstract The effect of Micro-Alloying element La on the corrosion behavior of Al-Mg-Si alloys in 3.5 wt. % NaCl solution was investigated. The results demonstrate that Micro-Alloying La causes the formation of a microstructure with discrete short-rod like Si particles and Mg2Si particles with a La-rich surface shell. The La-rich shell slows down the dissolution of the Mg2Si particles and mitigates the localized corrosion around the Mg2Si particles. The isolated Si particles hinder the corrosion propagation along grain boundaries. As a result, Micro-Alloying element La causes a significant improvement in the corrosion resistance of Al-Mg-Si alloys.
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effect mechanisms of micro alloying element la on microstructure and mechanical properties of hypoeutectic al si alloys
Journal of Materials Science & Technology, 2020Co-Authors: Qiuju Zheng, Hongxiang Jiang, Jie He, Jiuzhou Zhao, Lili ZhangAbstract:Abstract The rare earth influence on the as-cast microstructures and mechanical properties of aluminum alloys attracted great attentions in the last decades. But up to date no reports can be found on the effect of Micro-Alloying element La (La addition is below 0.1 wt.%) on the solidification of hypoeutectic Al-Si alloys. This study carried out solidification experiments with Al-6Si alloys micro-alloyed by element La. The α-Al grain refinement, the eutectic Si modification and the tensile properties improvement caused by Micro-Alloying element La were investigated. The effect mechanisms of La were discussed. It is demonstrated that the addition of La as low as 100 ppm can deprave the more effective heterogeneous nucleation conditions for the eutectic Si caused by the impurity P. The addition of 0.06 wt.% La is sufficient to achieve an ideal α-Al grain refinement, eutectic Si modification and ductility improvement of the alloys. LaAlSi phase forms in the Al-Si alloy with the additive amount of La higher than 0.06 wt.%. It has a tetragonal structure. Micro-Alloying element La refines the α-Al grains by working as a surfactant and modifies the eutectic Si by promoting the formation of the significant multiple Si twins.
Qiuju Zheng - One of the best experts on this subject based on the ideXlab platform.
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Effect of Micro-Alloying element La on corrosion behavior of Al-Mg-Si alloys
Corrosion Science, 2021Co-Authors: Qiuju Zheng, Hongxiang Jiang, Lili Zhang, Jiuzhou ZhaoAbstract:Abstract The effect of Micro-Alloying element La on the corrosion behavior of Al-Mg-Si alloys in 3.5 wt. % NaCl solution was investigated. The results demonstrate that Micro-Alloying La causes the formation of a microstructure with discrete short-rod like Si particles and Mg2Si particles with a La-rich surface shell. The La-rich shell slows down the dissolution of the Mg2Si particles and mitigates the localized corrosion around the Mg2Si particles. The isolated Si particles hinder the corrosion propagation along grain boundaries. As a result, Micro-Alloying element La causes a significant improvement in the corrosion resistance of Al-Mg-Si alloys.
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effect mechanisms of micro alloying element la on microstructure and mechanical properties of hypoeutectic al si alloys
Journal of Materials Science & Technology, 2020Co-Authors: Qiuju Zheng, Hongxiang Jiang, Jie He, Jiuzhou Zhao, Lili ZhangAbstract:Abstract The rare earth influence on the as-cast microstructures and mechanical properties of aluminum alloys attracted great attentions in the last decades. But up to date no reports can be found on the effect of Micro-Alloying element La (La addition is below 0.1 wt.%) on the solidification of hypoeutectic Al-Si alloys. This study carried out solidification experiments with Al-6Si alloys micro-alloyed by element La. The α-Al grain refinement, the eutectic Si modification and the tensile properties improvement caused by Micro-Alloying element La were investigated. The effect mechanisms of La were discussed. It is demonstrated that the addition of La as low as 100 ppm can deprave the more effective heterogeneous nucleation conditions for the eutectic Si caused by the impurity P. The addition of 0.06 wt.% La is sufficient to achieve an ideal α-Al grain refinement, eutectic Si modification and ductility improvement of the alloys. LaAlSi phase forms in the Al-Si alloy with the additive amount of La higher than 0.06 wt.%. It has a tetragonal structure. Micro-Alloying element La refines the α-Al grains by working as a surfactant and modifies the eutectic Si by promoting the formation of the significant multiple Si twins.
Yufeng Zheng - One of the best experts on this subject based on the ideXlab platform.
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micro alloying with mn in zn mg alloy for future biodegradable metals application
Materials & Design, 2016Co-Authors: F Y Zhou, Rencao Chang, Yinghong Yang, Zhongjie Pu, Yufeng ZhengAbstract:Abstract Zn as a novel biodegradable metal holds great potential in bioresorbable implant application since it possesses excellent biocompatibility and more corrosion resistant than Mg. In the present study, the effect of the Micro-Alloying element Mn on the Zn–Mg alloy was studied with mechanical properties, in vitro degradation behaviors and hemocompatibility being evaluated in comparison with pure Zn as control. The experimental Zn–Mg–Mn alloys were composed of the matrix Zn and secondary phase (MgZn 2 ). Meanwhile, Zn–Mg–Mn alloys ingots exhibited much higher yield strength (YS), ultimate tensile strength (UTS) and hardness compared to pure Zn. But their elongation was reduced. The results of immersion in Hank's solution for 30 days revealed that the sequence of corrosion rates from high to low was: as-cast Zn–1Mg–0.1Mn alloy > as-cast Zn–1.5Mg–0.1Mn alloy > pure Zn. The consequences of electrochemical tests indicated that the calculated corrosion rates followed the ranking order: as-cast Zn–1Mg–0.1Mn alloy > as-cast Zn–1.5Mg–0.1Mn alloy > pure Zn. The results of hemolysis rate and platelet adhesion implied that the studied alloys had good blood compatibility. Furthermore, after hot-rolling, the YS, UTS, elongation and hardness of Zn–1Mg–0.1Mn alloys were further improved and possessed the superior mechanics performance (YS 195.02 MPa, UTS 299.04 MPa, Elongation 26.07%, Hardness 107.82 Hv), appropriate corrosion rate ( V corr 0.25 mm/year) and excellent hemocompatibility (hemolysis rate of 1.10% and no signs of thrombogenicity), showing the preferable candidate as a biodegradable implant material.
Rahul Desai - One of the best experts on this subject based on the ideXlab platform.
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Effect of Boron Micro-Alloying on Microstructure and Corrosion Behavior of Dual-Phase Steel
Journal of Materials Engineering and Performance, 2019Co-Authors: Satendra Kumar, Rahul DesaiAbstract:The present work aims to understand the effect of boron (B) as a Micro-Alloying element on the mechanical properties and corrosion behavior of a dual-phase steel that was prepared from boron-added steel via hot rolling. The ‘B’ Micro-Alloying increased the volume fraction of martensite from ~ 25 to 50% and improved the hardenability as compared to unalloyed DP steel subjected to similar rolling and heat treatment conditions. The yield strength, tensile strength and corrosion resistance of boron-added DP steel significantly improved from 405 to 690 MPa, 632 to 890 MPa and 0.125 to 0.110 mm/year, respectively, as compared to the unalloyed DP steel.
Jie He - One of the best experts on this subject based on the ideXlab platform.
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effect mechanisms of micro alloying element la on microstructure and mechanical properties of hypoeutectic al si alloys
Journal of Materials Science & Technology, 2020Co-Authors: Qiuju Zheng, Hongxiang Jiang, Jie He, Jiuzhou Zhao, Lili ZhangAbstract:Abstract The rare earth influence on the as-cast microstructures and mechanical properties of aluminum alloys attracted great attentions in the last decades. But up to date no reports can be found on the effect of Micro-Alloying element La (La addition is below 0.1 wt.%) on the solidification of hypoeutectic Al-Si alloys. This study carried out solidification experiments with Al-6Si alloys micro-alloyed by element La. The α-Al grain refinement, the eutectic Si modification and the tensile properties improvement caused by Micro-Alloying element La were investigated. The effect mechanisms of La were discussed. It is demonstrated that the addition of La as low as 100 ppm can deprave the more effective heterogeneous nucleation conditions for the eutectic Si caused by the impurity P. The addition of 0.06 wt.% La is sufficient to achieve an ideal α-Al grain refinement, eutectic Si modification and ductility improvement of the alloys. LaAlSi phase forms in the Al-Si alloy with the additive amount of La higher than 0.06 wt.%. It has a tetragonal structure. Micro-Alloying element La refines the α-Al grains by working as a surfactant and modifies the eutectic Si by promoting the formation of the significant multiple Si twins.