Effect of Rotary Swaging on the Structure and Mechanical and Corrosion Properties of an Mg–1.1% Zn–1.7% Dy Alloy.

Autor: Martynenko, N. S., Temralieva, D. R., Lukyanova, E. A., Rybalchenko, O. V., Rybalchenko, G. V., Ogarkov, A. I., Tarytina, I. E., Yusupov, V. S., Dobatkin, S. V.
Zdroj: Russian Metallurgy (Metally); May2023, Vol. 2023 Issue 5, p620-628, 9p
Abstrakt: Abstract—The effect of rotary swaging (RS) at a strain ε = 1.28 and 2.31 on the microstructure, corrosion resistance, and mechanical properties of a potential medical Mg–1.1% Zn–1.7% Dy alloy is studied. RS at ε = 1.28 is shown to lead to almost 10-fold grain refining (from 300–400 to 30–40 μm). An increase in the strain to ε = 2.31 leads to the formation of a nonuniform microstructure characterized by areas containing grains both 30–40 and 5–10 μm in size. The grain refining after RS results in an increase in the electrochemical corrosion resistance (corrosion potential increases from –1550 ± 9 mV, which is observed for the quenched state, to –1442 ± 23 and –1454 ± 35 mV, which correspond to the alloy subjected to RS at ε = 1.28 and 2.31, respectively) but does not cause changes in the corrosion current density. In this case, the degradation rate of the alloy increases up to 3.46 ± 1.06 mm/year as the strain increases. The structure refining observed after RS at ε = 1.28 results in a substantial increase in the strength of the alloy as compared to that of the quenched alloy (ultimate strength increases from 70 ± 13 to 273 ± 7 MPa) and a decrease in the plasticity from 23.1 ± 5.1 to 14.0 ± 2.9%. An increase in the strain to ε = 2.31 does not increase the strength of the alloy (σu = 267 ± 4 MPa) and causes an increase in the plasticity (δ = 21.1 ± 1.6%), which is likely to result from textural changes having occurred in the alloy. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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