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Effect of lanthanum addition on microstructure and hardness of brass alloys produced by rheological squeeze casting

Journal of Rare Earths 2022年第12期40卷 1953-1962,I0006页

作者： Wenjing Gao Shuming Xing Ying Wang School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China School of Mechatronics and Vehicle Engineering Zhengzhou University of TechnologyZhengzhou 450044China

The effect of La addition(0-0.30 wt%)on the microstructure and hardness of rheological squeeze casting brass alloys was experimentally *** rheological squeeze casting process is improved by controlling the wall surface crystals and melt flow rate to realise the preparation of semi-solid melt with flow,and a brass alloy workpiece with La is *** microstructure and properties of the brass alloy samples were investigated using metallography,scanning electron microscopy,energy-dispersive X-ray spectroscopy,X-ray diffraction and hardness *** results indicate that the hardness of the rheological squeeze casting brass alloy is increased by 20.4%from 108 to 130 HBW with an increase in the La content from 0 to 0.30 wt%.The micro structural analysis results show that La significantly refines the primary a-phase grains,and the main mechanism is the constitutional undercooling and heterogeneous nucleation caused by the La enrichment in the front of the solid-liquid *** squeeze pressure promotes undercooling,which improves the nucleation rate and affects the solute diffusion and nucleus *** dual effects of these two aspects aggravate the grain refinement process,consequently increasing the number of grain boundaries and improving the hardness of the brass alloy.

关键词： Rheological squeeze casting La brass alloy Grain refinement Rare earths

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Corrosion behavior of dissimilar copper/brass joints welded by friction stir lap welding in alkaline solution

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Journal of Central South University 2019年第6期26卷 1573-1581页

作者： Kamran AMINI Farhad GHARAVI Department of Mechanical Engineering Tiran BranchIslamic Azad UniversityIsfahanIran Center for Advanced Engineering Research Majlesi BranchIslamic Azad UniversityIsfahanIran Department of Materials Engineering Sirjan BranchIslamic Azad UniversitySirjanIran

This study was done to evaluate the nugget zone(NZ)corrosion behavior of dissimilar copper/brass joints welded by friction stir lap welding(FSLW)in a solution of 0.015 mol/L borax(pH 9.3).To this end,dissimilar copper/brass plates were welded with two dissimilar heat inputs(low and high)during the welding *** high and low heat inputs were conducted with 710 r/min,16 mm/min and 450 r/min,25 mm/min,*** open circuit potential(OCP)measurements,electrochemical impedance spectroscopy(EIS)and Tafel polarization tests,the electrochemical behavior of the specimens in borate buffer solution was *** the help of scanning electron microscope(SEM),the morphology of welded specimen surfaces was examined after immersion in the test *** to the results,the NZ grain size and resistance improvement reduced due to the nugget zone corrosion with a decreased heat *** results obtained from Tafel polarization and EIS indicated the improved corrosion behavior of the welded specimen NZ with a decrease in the heat input during the welding process unlike the copper and brass ***,an increased heat input during the welding process shows a reduction in the conditions for forming the passive films with higher protection behavior.

关键词： friction stir welding copper brass alloy corrosion behavior alkaline solution dissimilar joint

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