Study of stress relaxation due to mismatch of thermal expansion coefficients of matrix and reinforcing particles in aluminum-based composites | Izvestiya vuzov. Fizika. 2025. № 11. DOI: 10.17223/00213411/68/11/18

Study of stress relaxation due to mismatch of thermal expansion coefficients of matrix and reinforcing particles in aluminum-based composites

Thermal stress relaxation in Al-A356 composites reinforced with SiC, Al2O3, and ScF3 nanoparticles was studied. A model is proposed that takes into account the elasticity of the particles and the viscoelasticity of the matrix. It is shown that at 523 K, stresses relax within 240 min, becoming negligible. With an increase in the volume fraction of reinforcing particles, thermal stresses increase. This fact is associated with an increase in the number of reinforcing particles in the alloy and, accordingly, with an increase in their contribution to material strengthening. When the material is heated or cooled, thermal stresses increase due to a mismatch between the coefficients of thermal expansion and the elastic constants of the matrix and particles. An increase in the yield strength during heating and cooling of the material was found.

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Keywords

deformation, stress relaxation, dispersion-hardened materials, nanoparticles, stress, plastic deformation, temperature stresses, aluminum

Authors

Name	Organization	E-mail
Matvienko Oleg V.	Tomsk State University	matvolegv@mail.ru
Daneyko Olga I.	Tomsk State University	olya_dan@mail.ru
Khrustalyov Anton P.	Tomsk State University	tofik0014@gmail.com
Valikhov Vladimir D.	Tomsk State University	valihov.snobls@gmail.com
Zhukov Ilya A.	Tomsk State University	gofra930@gmail.com

Всего: 5

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