Synergistic effect of Zr and Mo on precipitation and high-temperature properties of Al-Si-Cu-Mg alloys  

作　　者：Chao Gao Bing-rong Zhang Yin-ming Li Zhi-ming Wang Xiang-bin Meng 

机构地区：[1]Faculty of Mechanical Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China [2]Hebei Ounai Machinery Mould Co.Ltd.,Xingtai 054500,Hebei,China

出　　处：《China Foundry》2024年第1期71-81,共11页中国铸造（英文版）

基　　金：supported by the Key R&D Program of Shandong Province of China(Grant number 2019QYTPY057);the Natural Science Foundation of Shandong Province of China(Grant numbers ZR2020ME110,ZR2021ME023)。

摘　　要：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 

分 类 号：TG146.21[一般工业技术—材料科学与工程]