Effect of Homogenization Treatment on Microstructure Evolution of High Zn Ultra-High Strength Aluminum Alloy
In this paper,metallographic optical microscope and scanning electron microscope(SEM)are used to detect and analyze the microstructure and changes of high Zn and ultra-high strength aluminum alloy ingot before and after homogenization.The results show that severe dendrite segregation exists in the alloy as cast.The main phases in the alloy are soluble intermetallic compounds composed of MgZn2 phase and T(AlZnMgCu)phase,and refractory intermetallic compounds composed of Mn,Fe and Ni.The results of homogenized heat treatment of the ingot show that,unlike the aluminum alloys with low Zn content such as 7050 alloy and 7055 alloy,there is no T to S(Al2CuMg)phase conversion when the Zn content of the alloy is as high as 9.8％.The analysis shows that this phenomenon is closely related to the content and diffusion of Zn,and it is known that the higher the content of Zn,the more difficult the conversion process.
high zinc ultra-high strength aluminum alloyhomogenizationmicrostructureS(Al2CuMg)phase
万方数据
维普
