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Synergistic effect of Zr and Mo on precipitation and high-temperature properties of al-si-cu-mg alloys

China Foundry 2024年第1期21卷 71-81页

作者： Chao Gao Bing-rong Zhang Yin-ming Li Zhi-ming Wang Xiang-bin Meng Faculty of Mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Hebei Ounai Machinery Mould Co.Ltd. Xingtai 054500HebeiChina

This study focuses on finding a solution to the sharp decline in mechanical properties of al-si-cu-mg alloys due to rapid coarsening of traditional intermediate phases at high temperature.A new type of modified al oy,to be used in automobile engines at high temperatures,was prepared by adding Zr and Mo into al-si-cu-mg alloy.The synergistic effects of Zr and Mo on the microstructure evolution and high-temperature mechanical properties were studied.Results show that the addition of Zr and Mo generates a series of intermetallic phases dispersed in the alloy.They can improve the strength of the alloy by hindering dislocation movement and crack propagation.In addition,some nano-strengthened phases show coherent interfaces with the matrix and improve grain refinement.The addition of Mo greatly improves the heat resistance of the alloy.The extremely low diffusivity of Mo enables it to improve the thermal stability of the intermetallic phases,inhibit precipitation during aging,reduce the size of the precipitates,and improve the heat resistance of the alloy.

关键词： al-si-cu-mg alloy high-temperature properties Zr-Mo-rich intermetallics nano-strengthening phases

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Selective Laser Melting of al-7si-0.5mg-0.5cu:Effect of Heat Treatment on Microstructure Evolution,Mechanical Properties and Wear Resistance

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Acta Metallurgica sinica(English Letters) 2022年第3期35卷 389-396页

作者： Pei Wang sijie Yu Jaskarn Shergill Anil Chaubey Jürgen Eckert Konda Gokuldoss Prashanth Sergio Scudino Additive Manufacturing Institute College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China Institute for Complex Materials IFW DresdenHelmholtzstraBe 2001069 DresdenGermany Institute of Minerals and Materials Technology(IMMT) Bhubaneshwar 751013OrissaIndia Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraBe 128700 LeobenAustria Department of Materials Science Chair of Materials PhysicsMontanuniversitat LeobenJahnstraBe 128700 LeobenAustria Department of Mechanical and Industrial Engineering Tallinn University of TechnologyEhitajete tee 519086 TallinnEstonia CBCMT School of Mechanical EngineeringVellore Institute of TechnologyVellore.Tamil Nadu 632014India Adjunct With National University of Science and Technology aMIsi Sa Leninsky Prosp..4.119049 MoscowRussia

al-7si-0.5mg-0.5cu alloy specimens have been fabricated by selective laser melting(SLM).In this study,the effects of solution treatment,quenching,and artifi cial aging on the microstructural evolution,as well as mechanical and wear properties,have been investigated.The as-prepared samples show a heterogeneous cellular microstructure with two different cell sizes composed ofα-al and si phases.After solution-treated and quenched(SQ)heat treatment,the cellular microstructure disappears,and coarse and lumpy si phase precipitates and a rectangular cu-rich phase were observed.Subsequent aging after solution-treated and quenched(SQA)heat treatment causes the formation of nanosized cu-rich precipitates.The asprepared SLMs sample has good mechanical properties and wear resistance(compressive yield strength:215±6 MPa and wear rate 2×10^(-13)m^(3)/m).The SQ samples with lumpy si particles have the lowest strength of 167±13 MPa and the highest wear rate of 6.18×10^(1-13)m^(3)/m.The formation of nanosized cu-rich precipitates in the SQA samples leads to the highest compressive yield strength of 233±6 MPa and a good wear rate of 5.06×10^(-13)m^(3)/m.

关键词： Selective laser melting al-si-cu-mg alloy Heat treatment Microstructure Mechanical properties Wear properties

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Particles Morphology and Forming Analysis of al-si-cu-mg alloys

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Journal of Harbin Institute of Technology(New Series) 2015年第6期22卷 85-91页

作者： Shouren Wang Yiping Tang Yang Qiao JaeHyung Cho Jixue Zhou School of Mechanical Engineering University of Jinan Korea Institute of Materials Science Institute of New Materials Research Shandong Academy of Sciences

The study aims at observation of precipitation distribution micrograph and analysis of forming kinetics mechanism of microstructure particles of al-si-cu-mg alloys. The microstructure morphology of some particles such as primary silicon and precipitates from the matrix of al-si-cu-mg alloys is observed by OM,SEM and EDS. The primary silicon forming kinetics is analyzed by EBSD. Twin plane re-entrant edge growth mode results in the blocky or diamonded TRD morphology formation. The precipitates of Q-al5cu2mg8si6,θ-al2cu,β-al5Fesi and ε-mg2si are characterized by EDS and they are distributed in the eutectic region. The forming kinetics of them is analyzed by DSC. six peaks are present in particles formation in different temperature ranges.The particles forming are determined by the analysis of the DSC traces during heating and cooling of al-si-cumg alloys.

关键词： precipitates morphology kinetics al-si-cu-mg alloy DSC

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