E. A. Lukyanova, O. V. Rybal’chenko, N. S. Martynenko, G. V. Rybal’chenko, E. I. Chistyukhina, M. A. Kaplan, V. A. Andreev, N. A. Andreeva, T. V. Dobatkina, S. V. Dobatkin
{"title":"Microstructure, Mechanical Properties, and Corrosion Characteristics of a Mg–Y–Zn–Cd–Zr Alloy Subjected to Rotary Forging","authors":"E. A. Lukyanova, O. V. Rybal’chenko, N. S. Martynenko, G. V. Rybal’chenko, E. I. Chistyukhina, M. A. Kaplan, V. A. Andreev, N. A. Andreeva, T. V. Dobatkina, S. V. Dobatkin","doi":"10.1134/S0036029526700977","DOIUrl":null,"url":null,"abstract":"<p><b>Abstract</b>—The effect of strain induced by rotary forging on the structure, aging kinetics at 200°C, mechanical properties, and corrosion resistance of a hot-extruded Mg–7.5 wt % Y–0.5 wt % Zn–0.5 wt % Cd–0.5 wt % Zr alloy is investigated. The rotary forging is performed at 475°C to the total drawing ratio μ = 2.5 or 4.5 either after preliminary intermediate two-stage homogenizing annealing or without it. For all treatments, the alloy structure is found to consist of magnesium solid-solution grains containing lamellar LPSO phase inclusions and a block LPSO phase extended along the deformation direction. The average grain size of the alloy in the initial hot-extruded state is ~ 8 μm; after intermediate homogenizing annealing, it is ~30 μm and, after subsequent rotary forging, whatever the degree of strain, the average grain size is ~15 μm. As a result of prolonged aging heat treatment (for up to 192 h), the alloy undergoes strengthening owing to the decomposition of the supersaturated magnesium solid solution; however, the strengthening effect observed after rotary forging is less pronounced as compared to that observed for the hot-extruded and subsequently annealed state. As is shown, the two-stage homogenizing annealing of the hot-extruded alloy does not change its strength and plasticity characteristics. Under these conditions, the alloy exhibits an ultimate tensile strength (σ<sub>u</sub>) of 270–290 MPa, a 0.2 offset yield strength (σ<sub>0.2</sub>) of 200–210 MPa, and an elongation (δ) of ~18.5%. The rotary forging increases the strength of the hot-extruded alloy to σ<sub>u</sub> ≈ 420 MPa and σ<sub>0.2</sub> ≈ 360 MPa, whereas, after homogenizing annealing, they reach 380 and 330 MPa, respectively. As the degree of strain during rotary forging increases, the plasticity of the hot-extruded alloy decreases to δ ≈ 7%; in this case, whatever, the degree of strain, the two-stage homogenizing annealing favors maintaining the alloy plasticity after rotary forging. The homogenizing annealing of the hot-extruded Mg–7.5Y–0.5Zn–0.5Cd–0.5Zr alloy is found to improve its corrosion resistance, namely, decreases the corrosion rate by more than three times, in particular, after rotary forging.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2026 5","pages":"814 - 825"},"PeriodicalIF":0.3000,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Metallurgy (Metally)","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1134/S0036029526700977","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract—The effect of strain induced by rotary forging on the structure, aging kinetics at 200°C, mechanical properties, and corrosion resistance of a hot-extruded Mg–7.5 wt % Y–0.5 wt % Zn–0.5 wt % Cd–0.5 wt % Zr alloy is investigated. The rotary forging is performed at 475°C to the total drawing ratio μ = 2.5 or 4.5 either after preliminary intermediate two-stage homogenizing annealing or without it. For all treatments, the alloy structure is found to consist of magnesium solid-solution grains containing lamellar LPSO phase inclusions and a block LPSO phase extended along the deformation direction. The average grain size of the alloy in the initial hot-extruded state is ~ 8 μm; after intermediate homogenizing annealing, it is ~30 μm and, after subsequent rotary forging, whatever the degree of strain, the average grain size is ~15 μm. As a result of prolonged aging heat treatment (for up to 192 h), the alloy undergoes strengthening owing to the decomposition of the supersaturated magnesium solid solution; however, the strengthening effect observed after rotary forging is less pronounced as compared to that observed for the hot-extruded and subsequently annealed state. As is shown, the two-stage homogenizing annealing of the hot-extruded alloy does not change its strength and plasticity characteristics. Under these conditions, the alloy exhibits an ultimate tensile strength (σu) of 270–290 MPa, a 0.2 offset yield strength (σ0.2) of 200–210 MPa, and an elongation (δ) of ~18.5%. The rotary forging increases the strength of the hot-extruded alloy to σu ≈ 420 MPa and σ0.2 ≈ 360 MPa, whereas, after homogenizing annealing, they reach 380 and 330 MPa, respectively. As the degree of strain during rotary forging increases, the plasticity of the hot-extruded alloy decreases to δ ≈ 7%; in this case, whatever, the degree of strain, the two-stage homogenizing annealing favors maintaining the alloy plasticity after rotary forging. The homogenizing annealing of the hot-extruded Mg–7.5Y–0.5Zn–0.5Cd–0.5Zr alloy is found to improve its corrosion resistance, namely, decreases the corrosion rate by more than three times, in particular, after rotary forging.
期刊介绍：
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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