{"title":"Correlation of Microstructure and Corrosion Behavior of squeeze-cast Mg-4.0Y-4.0Zn-0.5Zr-0.2Ca (wt%) Alloys Constituting W and LPSO Secondary Phases","authors":"Meeta Ashok Kamde, Yogendra Mahton, Yogesh Singh, Santosh Kumar Sahoo, Sourav Ganguly, N Surya Prakash, Mangal Roy, Vidhyadhar Mishra, Suman Sarkar, Partha Saha","doi":"10.1007/s12540-024-01712-x","DOIUrl":null,"url":null,"abstract":"<p>The present study aims to explore the effect of microstructural evolution via forging on corrosion behavior of squeeze-cast Mg-4.0Y-4.0Zn-0.5Zr-0.2Ca (wt%) WZ44 alloys comprising W-type (Mg<sub>3</sub>Y<sub>2</sub>Zn<sub>3</sub>), long-period stacking order (LPSO, Mg<sub>12</sub>YZn) as secondary phases and α-Mg matrix. In particular, the as-cast ingot was solutionized at 400<sup>ο</sup>C for 20 h, followed by forging at 450<sup>ο</sup>C by applying a compressive pressure of 280 kg/cm<sup>2</sup> for 45 min, which has a pronounced effect on the grains orientation, texture, and distribution of the second phases. The forging inflicted a spreading of (0002) grains along the longitudinal direction and strong basal texture, causing improved tensile yield strength and ductility by strain hardening phenomena. The corrosion behavior of alloy specimens assessed in 0.1 M NaCl solution and benchmarked against pure Mg using pH, open circuit potential (OCP) variation with immersion duration, mass loss, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) reveal inferior corrosion resistance of alloy specimens owing to the presence of highly cathodic LPSO and W-phase causing severe pitting of α-Mg with corrosion products comprising Mg, Y-rich complex phases. Nevertheless, forged alloy exhibited excellent corrosion protection ability (∼4–5 h) during 48 h long EIS analysis owing to a reduction in Volta potential difference between W-type and LPSO phase (98 ± 2.3 mV) with α-Mg matrix confirmed by scanning Kelvin probe force microscopy (SKPFM) diminishing severe pitting of grains concomitant with a dense protective barrier of oxide/hydroxide layers preventing ingression of Cl<sup>−</sup>-ions. Overall, the work emphasizes that W-phase and LPSO-rich WZ44 alloy, which is prone to corrosion, can exhibit excellent mechanical properties and slightly improved saltwater corrosion resistance provided by texture effect, and second-phase distribution via forging at elevated temperature.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"9 1","pages":""},"PeriodicalIF":3.3000,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metals and Materials International","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s12540-024-01712-x","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The present study aims to explore the effect of microstructural evolution via forging on corrosion behavior of squeeze-cast Mg-4.0Y-4.0Zn-0.5Zr-0.2Ca (wt%) WZ44 alloys comprising W-type (Mg3Y2Zn3), long-period stacking order (LPSO, Mg12YZn) as secondary phases and α-Mg matrix. In particular, the as-cast ingot was solutionized at 400οC for 20 h, followed by forging at 450οC by applying a compressive pressure of 280 kg/cm2 for 45 min, which has a pronounced effect on the grains orientation, texture, and distribution of the second phases. The forging inflicted a spreading of (0002) grains along the longitudinal direction and strong basal texture, causing improved tensile yield strength and ductility by strain hardening phenomena. The corrosion behavior of alloy specimens assessed in 0.1 M NaCl solution and benchmarked against pure Mg using pH, open circuit potential (OCP) variation with immersion duration, mass loss, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) reveal inferior corrosion resistance of alloy specimens owing to the presence of highly cathodic LPSO and W-phase causing severe pitting of α-Mg with corrosion products comprising Mg, Y-rich complex phases. Nevertheless, forged alloy exhibited excellent corrosion protection ability (∼4–5 h) during 48 h long EIS analysis owing to a reduction in Volta potential difference between W-type and LPSO phase (98 ± 2.3 mV) with α-Mg matrix confirmed by scanning Kelvin probe force microscopy (SKPFM) diminishing severe pitting of grains concomitant with a dense protective barrier of oxide/hydroxide layers preventing ingression of Cl−-ions. Overall, the work emphasizes that W-phase and LPSO-rich WZ44 alloy, which is prone to corrosion, can exhibit excellent mechanical properties and slightly improved saltwater corrosion resistance provided by texture effect, and second-phase distribution via forging at elevated temperature.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
