{"title":"mg - al基轻质复合浓缩合金的相稳定性和力学性能增强","authors":"Quan Dong , Yufei Zhang , Yuhao Chen , Qian Shangguan , Chengyu Peng , Jing Zhang","doi":"10.1016/j.intermet.2025.109001","DOIUrl":null,"url":null,"abstract":"<div><div>In this work, three Mg-rich lightweight complex concentrated alloys (LW-CCAs) with Al density classes, <em>i.e.</em>, Mg<sub>77.5</sub>Al<sub>12.5</sub>Li<sub>5</sub>Zn<sub>2.5</sub>Cu<sub>2.5</sub> (<em>at.</em>%), Mg<sub>79</sub>Al<sub>13.5</sub>Zn<sub>3</sub>Cu<sub>3</sub>Mn<sub>1</sub>Ce<sub>0.5</sub> (<em>at</em>.%), and Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> (<em>at.</em>%), have been designed according to the thermodynamic empirical guidelines and synthesized via a combination of mechanical alloying (MA) and cold-press sintering (CPS). The effects of composition and heat-treatment temperature on the microstructures and mechanical properties of LW-CCAs were analyzed. The results suggest that the microstructures of the as-milled Mg<sub>77.5</sub>Al<sub>12.5</sub>Li<sub>5</sub>Zn<sub>2.5</sub>Cu<sub>2.5</sub> and Mg<sub>79</sub>Al<sub>13.5</sub>Zn<sub>3</sub>Cu<sub>3</sub>Mn<sub>1</sub>Ce<sub>0.5</sub> LW-CCAs predominantly consist of an HCP phase, while the as-milled Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> LW-CCA exhibits only a single HCP structure. The LW-CCAs undergos distinct phase transformation with the precipitation of intermetallics after CPS. The Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> LW-CCA has the highest phase stability as affected by the <em>T</em><sub>m</sub>, Δχ, Δ<em>H</em><sub>mix</sub>, and Δ<em>G</em><sub>mix</sub> parameters. Moreover, the as-milled LW-CCAs exhibit high hardness features owing to the combined result of fine grain effect, solid solution effect, and dislocation effect, among which the Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> alloy possess the highest hardness of 1.53 GPa. The Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> alloy sintered at 400°C exhibits excellent hardness and specific hardness, reaching 164.7 HV and 74.2 HV·cm<sup>3</sup>·g<sup>−1</sup>, respectively.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109001"},"PeriodicalIF":4.8000,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhanced phase stability and mechanical properties of Mg-Al-based lightweight complex concentrated alloys\",\"authors\":\"Quan Dong , Yufei Zhang , Yuhao Chen , Qian Shangguan , Chengyu Peng , Jing Zhang\",\"doi\":\"10.1016/j.intermet.2025.109001\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>In this work, three Mg-rich lightweight complex concentrated alloys (LW-CCAs) with Al density classes, <em>i.e.</em>, Mg<sub>77.5</sub>Al<sub>12.5</sub>Li<sub>5</sub>Zn<sub>2.5</sub>Cu<sub>2.5</sub> (<em>at.</em>%), Mg<sub>79</sub>Al<sub>13.5</sub>Zn<sub>3</sub>Cu<sub>3</sub>Mn<sub>1</sub>Ce<sub>0.5</sub> (<em>at</em>.%), and Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> (<em>at.</em>%), have been designed according to the thermodynamic empirical guidelines and synthesized via a combination of mechanical alloying (MA) and cold-press sintering (CPS). The effects of composition and heat-treatment temperature on the microstructures and mechanical properties of LW-CCAs were analyzed. The results suggest that the microstructures of the as-milled Mg<sub>77.5</sub>Al<sub>12.5</sub>Li<sub>5</sub>Zn<sub>2.5</sub>Cu<sub>2.5</sub> and Mg<sub>79</sub>Al<sub>13.5</sub>Zn<sub>3</sub>Cu<sub>3</sub>Mn<sub>1</sub>Ce<sub>0.5</sub> LW-CCAs predominantly consist of an HCP phase, while the as-milled Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> LW-CCA exhibits only a single HCP structure. The LW-CCAs undergos distinct phase transformation with the precipitation of intermetallics after CPS. The Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> LW-CCA has the highest phase stability as affected by the <em>T</em><sub>m</sub>, Δχ, Δ<em>H</em><sub>mix</sub>, and Δ<em>G</em><sub>mix</sub> parameters. Moreover, the as-milled LW-CCAs exhibit high hardness features owing to the combined result of fine grain effect, solid solution effect, and dislocation effect, among which the Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> alloy possess the highest hardness of 1.53 GPa. The Mg<sub>80</sub>Al<sub>8</sub>Zn<sub>7</sub>Gd<sub>2.5</sub>Y<sub>2.5</sub> alloy sintered at 400°C exhibits excellent hardness and specific hardness, reaching 164.7 HV and 74.2 HV·cm<sup>3</sup>·g<sup>−1</sup>, respectively.</div></div>\",\"PeriodicalId\":331,\"journal\":{\"name\":\"Intermetallics\",\"volume\":\"187 \",\"pages\":\"Article 109001\"},\"PeriodicalIF\":4.8000,\"publicationDate\":\"2025-09-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Intermetallics\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0966979525003668\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Intermetallics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0966979525003668","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Enhanced phase stability and mechanical properties of Mg-Al-based lightweight complex concentrated alloys
In this work, three Mg-rich lightweight complex concentrated alloys (LW-CCAs) with Al density classes, i.e., Mg77.5Al12.5Li5Zn2.5Cu2.5 (at.%), Mg79Al13.5Zn3Cu3Mn1Ce0.5 (at.%), and Mg80Al8Zn7Gd2.5Y2.5 (at.%), have been designed according to the thermodynamic empirical guidelines and synthesized via a combination of mechanical alloying (MA) and cold-press sintering (CPS). The effects of composition and heat-treatment temperature on the microstructures and mechanical properties of LW-CCAs were analyzed. The results suggest that the microstructures of the as-milled Mg77.5Al12.5Li5Zn2.5Cu2.5 and Mg79Al13.5Zn3Cu3Mn1Ce0.5 LW-CCAs predominantly consist of an HCP phase, while the as-milled Mg80Al8Zn7Gd2.5Y2.5 LW-CCA exhibits only a single HCP structure. The LW-CCAs undergos distinct phase transformation with the precipitation of intermetallics after CPS. The Mg80Al8Zn7Gd2.5Y2.5 LW-CCA has the highest phase stability as affected by the Tm, Δχ, ΔHmix, and ΔGmix parameters. Moreover, the as-milled LW-CCAs exhibit high hardness features owing to the combined result of fine grain effect, solid solution effect, and dislocation effect, among which the Mg80Al8Zn7Gd2.5Y2.5 alloy possess the highest hardness of 1.53 GPa. The Mg80Al8Zn7Gd2.5Y2.5 alloy sintered at 400°C exhibits excellent hardness and specific hardness, reaching 164.7 HV and 74.2 HV·cm3·g−1, respectively.
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