4.5 Article

Hot Deformation Behavior of a Co-Spray-Formed Al-Si/7075 Bimetallic Gradient Alloy

期刊

METALS
卷 11, 期 8, 页码 -

出版社

MDPI
DOI: 10.3390/met11081266

关键词

spray-deposited; functionally graded materials; hot deformation behavior; constitutive equation

资金

  1. National Natural Science Foundation of China [51901057, 51801044, 52071118]
  2. China Postdoctoral Science Foundation [2019M661275, 2020T130030ZX]
  3. Scientific Research Foundation of Harbin Institute of Technology, China [AUGA5710001320]
  4. Head Goose project of Heilongjiang Province [AUEA5640208620]

向作者/读者索取更多资源

This paper investigates the hot compression behavior of co-spray-formed Al-Si/7075 bimetallic gradient alloys. The results show that the flow stress of deposited alloys decreases gradually with a decrease in strain rate and an increase in temperature, following the Arrhenius relationship. The deformation activation energy of the gradient alloy increases gradually from bottom to top in the height direction.
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.

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