Joint effect of quasicrystalline icosahedral and L1_(2)-strucutred phases precipitation on the grain structure and mechanical properties of aluminum-based alloys  

作　　者：A.G.Mochugovskiy N.Yu.Tabachkova M.Esmaeili Ghayoumabadi V.V.Cheverikin A.V.Mikhaylovskaya 

机构地区：[1]National University of Sciences and Technology“MISIS”,119049,Leninskiy Ave.4,Moscow,Russia [2]Prokhorov General Physics Institute of the Russian Academy of Sciences,Moscow,Russia

出　　处：《Journal of Materials Science & Technology》2021年第28期196-206,共11页材料科学技术（英文版）

基　　金：funded by RFBF grant#20-03-00778;the financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST MISIS for the part of the grain structure analysis。

摘　　要：Dispersoid hardening is a key factor in increasing the recrystallization resistance and mechanical strength of non-heat treatable aluminum-based alloys.Mn and Zr are the main elements that form dispersoids in commercial Al-based alloys.In this work,the annealing-induced precipitation behavior,the grain structure,and the mechanical properties of Al-3.0 Mg-1.1 Mn and Al-3.0 Mg-1.1 Mn-0.25 Zr alloys were studied.The microstructure and the mechanical properties were significantly affected by annealing regimes after casting for both alloys.The research demonstrated a possibility to form high-density distributed quasicrystalline-structured I-phase precipitates with a mean size of 29 nm during low-temperature annealing of as-cast alloys.Fine manganese-bearing precipitates of I-phase increased recrystallization resistance and significantly enhanced the mechanical strength of the alloys studied.The estimated strengthening effect owing to I-phase precipitation was 150 MPa.Due to the formation of L1_(2)-structured Al3Zr dispersoids with a mean size of 5.7 nm,additional alloying with Zr increased yield strength by about 90 MPa.The L1_(2)-phase strengthening effect was estimated through the dislocation bypass looping and shearing mechanisms.

关 键 词：Aluminum alloy QUASICRYSTALS Dispersoid hardening RECRYSTALLIZATION Mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程]