{"title":"构成 W 和 LPSO 次生相的挤压铸造 Mg-4.0Y-4.0Zn-0.5Zr-0.2Ca (wt%) 合金的微观结构与腐蚀行为的相关性","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":"{\"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. 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引用次数: 0
摘要
本研究旨在探讨通过锻造产生的微结构演变对挤压铸造的 Mg-4.0Y-4.0Zn-0.5Zr-0.2Ca (wt%) WZ44 合金腐蚀行为的影响，该合金由 W 型（Mg3Y2Zn3）、长周期堆积阶（LPSO，Mg12YZn）作为次生相和α-Mg 基体组成。其中，铸锭在 400οC 下固溶 20 小时，然后在 450οC 下以 280 kg/cm2 的压缩压力锻造 45 分钟，这对晶粒取向、质地和第二相的分布有明显影响。锻造过程中，(0002) 晶粒沿纵向扩展，基底纹理强烈，通过应变硬化现象提高了拉伸屈服强度和延展性。利用 pH 值、开路电位（OCP）随浸泡时间的变化、质量损失、电位极化（PDP）和电化学阻抗光谱（EIS）对合金试样在 0.1 M NaCl 溶液中的腐蚀行为进行了评估，并将其与纯镁进行对比，结果表明合金试样的耐腐蚀性能较差，原因是高阴极 LPSO 和 W 相的存在导致α-镁出现严重点蚀，腐蚀产物包括镁、富 Y 复相。然而，锻造合金在长达 48 小时的 EIS 分析中表现出卓越的腐蚀保护能力（∼4-5 小时），原因是 W 型和 LPSO 相之间的伏特电位差缩小（98 ± 2.3 mV），α-Mg 基体经扫描开尔文探针力显微镜（SKPFM）确认，晶粒的严重点蚀减少，同时氧化物/氢氧化物层的致密保护屏障阻止了 Cl 离子的侵入。总之，这项研究强调了容易腐蚀的 W 相和富含 LPSO 的 WZ44 合金可以表现出优异的机械性能，并通过纹理效应和高温锻造的第二相分布，略微提高了耐盐水腐蚀性能。
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
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.
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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.
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