首页|Microstructure,mechanical properties and multiphase synergistic strengthening mechanisms of a novel laser additive manufactured AlNi6TiZr alloy

Microstructure,mechanical properties and multiphase synergistic strengthening mechanisms of a novel laser additive manufactured AlNi6TiZr alloy

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In this work,selective laser melting(SLM)process is used to prepare the AlNi6TiZr alloy.By analyzing the printing quality and mechanical properties of the printed specimens with different process parameters,the SLM forming window of AlNi6TiZr is obtained.The relative density of the sample printed with 270 W-1100 mm/s(laser energy density:82 J/mm3)reaches 99.7%,exhibiting excellent mechanical properties(yield strength(YS):421.7 MPa;ultimate tensile strength(UTS):480.4 MPa).After an aging treatment of 325 ℃-12 h,the YS and UTS of the sample increased to 494 MPa and 550.7 MPa,respectively.Adding Ni,Ti,and Zr components promoted the generation of multi-phase precipitates in the Al alloy and improved the synergistic strengthening effect of multi-phases.The hard-shell structure(HSS)formed by the Al3Ni phase at the grain boundary significantly strengthened the grain boundary strength.The precipitated Al3(Ti,Zr)phases at the grain boundaries prevent grain growth and dislocation movement.The Al3Ni and Al3(Ti,Zr)phases have good thermal stability that can still maintain excellent enhancement effects at high temperature.AlNi6TiZr alloy has great application prospects in medium and high-temperature environments.

Selective laser meltingAl6NiTiZr alloyMicrostructureMechanical propertiesThermal stabilityStrengthening mechanism

Jiang Bi、Liukun Wu、Zeqi Liu、Haixiang Wang、Shide Li、Ji Wang、Zhuoyun Yang、Nannan Lu、Xi Chen、Mikhail Dmitrievich Starostenkov、Guojiang Dong

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Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education.Yanshan University,Qinhuangdao 066004,China

CITIC Dicastal Co.,Ltd.,Qinhuangdao 066004,China

Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China

General Physics Department,Altai State Technical University,Leninist.46,Bamaul 656099,Russia

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Post Graduate Innovation Funding Project of Hebei ProvinceHebei Natural Science Foundation of ChinaSpecial Project for Local Science and Technology Development Guided by the Central Government of Hebei Province

CXZZSS2023041E2021203138236Z1805G

2024

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子:0.657
ISSN:1005-0302
年,卷(期):2024.178(11)
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