Abstract
In this paper, we report the results obtained from the hot compression behaviour of co-spray-formed Al-Si/7075 bimetallic gradient alloys by investigating the five selected layers divided evenly from top to bottom. It was found that with a decrease in the strain rate and an increase in temperature, the hot compression flow stress of deposited alloys decreases gradually, as expected. The relationship between flow stress, temperature and strain rate follows the Arrhenius relationship. The deformation activation energy of the co-spray formed gradient alloy gradually increases from bottom to top in the height direction, which are 100.15, 167.35, 185.54, 208.78 and 220.83 KJ/mol, indicating that the degree of difficulty in the deformation of the alloy is affected by changes in the silicon content of the alloy. Finally, the flow stress constitutive equation is calculated for each layer of alloy material, which is instructive for the subsequent study of the densification process of co-spray-formed gradient alloys.
Highlights
IntroductionWith the rapid development of science and technology, the requirements for the environment and properties of materials are becoming more diversified
The deformation activation energy of the co-spray formed gradient alloy gradually increases from bottom to top in the height direction, which are 100.15, 167.35, 185.54, 208.78 and 220.83 KJ/mol, indicating that the degree of difficulty in the deformation of the alloy is affected by changes in the silicon content of the alloy
According to the microstructure analysis and EDS results of the five layers from gradient deposited alloy, the silicon content gradually increases from bottom to top, and the microstructures of the gradient alloy at different heights show the characteristics corresponding to the silicon content
Summary
With the rapid development of science and technology, the requirements for the environment and properties of materials are becoming more diversified. The 7075 alloy is widely used in many fields due to its excellent mechanical properties such as high specific strength and good plastic deformation ability [9,10]. Cui et al studied the deformation behavior of spray formed hypereutectic aluminum–silicon alloys under different temperatures and strain rates through compression experiments, and found that flow stress increases with the decrease of compression temperature and the increase in the strain rate [18]. Research is lacking on the deformation behavior of co-spray formed gradient aluminum alloys. The study of the hot deformation behavior of co-spray-formed gradient aluminum alloys is significant. The co-spray formed gradient aluminum alloy was divided into five layers from top to bottom, and the thermal deformation behavior of each layer was studied and the constitutive equations were obtained
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