{"title":"高熵 Al20Ni20Co20Fe20Cr20 合金在高压和高温作用下的结构演变研究","authors":"S. G. Menshikova","doi":"10.1134/S1027451024700551","DOIUrl":null,"url":null,"abstract":"<p>The structure of a high-entropy submicrocrystalline AlNiCoFeCr alloy of equiatomic composition obtained by arc melting is studied by electron microscopy and X-ray diffraction. The alloy consists of a substitutional solid solution with the packing of components corresponding to the B2 structure based on a distorted BCC lattice. The average grain size of the B2 phase is 120 nm. The stability of the alloy with increasing temperature is studied. When the alloy is heated to 1650°C and subsequently solidified an increase in the grain size of the B2 phase and the separation of several phases with different morphologies along the grain boundaries are observed in the structure. The effect of high pressure on the alloy structure after quenching from the liquid phase is explored. The structure of the sample obtained upon solidification at a temperature of 1650°C under a pressure of 5 GPa is different from the structure of the alloy obtained at a temperature of 1650°C by arc melting. Under thermobaric conditions, a structure of mixed A1 (body-centered cubic) and A2 (face-centered cubic) phases is formed in the alloy. The alloy has high hardness, the value of which, depending on the selected production conditions, varies from 4.8 to 5.5 GPa.</p>","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"851 - 858"},"PeriodicalIF":0.5000,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Study of the Evolution of the Structure of a High-Entropy Al20Ni20Co20Fe20Cr20 Alloy under the Action of High Pressure and Temperature\",\"authors\":\"S. G. Menshikova\",\"doi\":\"10.1134/S1027451024700551\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The structure of a high-entropy submicrocrystalline AlNiCoFeCr alloy of equiatomic composition obtained by arc melting is studied by electron microscopy and X-ray diffraction. The alloy consists of a substitutional solid solution with the packing of components corresponding to the B2 structure based on a distorted BCC lattice. The average grain size of the B2 phase is 120 nm. The stability of the alloy with increasing temperature is studied. When the alloy is heated to 1650°C and subsequently solidified an increase in the grain size of the B2 phase and the separation of several phases with different morphologies along the grain boundaries are observed in the structure. The effect of high pressure on the alloy structure after quenching from the liquid phase is explored. The structure of the sample obtained upon solidification at a temperature of 1650°C under a pressure of 5 GPa is different from the structure of the alloy obtained at a temperature of 1650°C by arc melting. Under thermobaric conditions, a structure of mixed A1 (body-centered cubic) and A2 (face-centered cubic) phases is formed in the alloy. The alloy has high hardness, the value of which, depending on the selected production conditions, varies from 4.8 to 5.5 GPa.</p>\",\"PeriodicalId\":671,\"journal\":{\"name\":\"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques\",\"volume\":\"18 4\",\"pages\":\"851 - 858\"},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2024-09-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1027451024700551\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"PHYSICS, CONDENSED MATTER\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S1027451024700551","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
Study of the Evolution of the Structure of a High-Entropy Al20Ni20Co20Fe20Cr20 Alloy under the Action of High Pressure and Temperature
The structure of a high-entropy submicrocrystalline AlNiCoFeCr alloy of equiatomic composition obtained by arc melting is studied by electron microscopy and X-ray diffraction. The alloy consists of a substitutional solid solution with the packing of components corresponding to the B2 structure based on a distorted BCC lattice. The average grain size of the B2 phase is 120 nm. The stability of the alloy with increasing temperature is studied. When the alloy is heated to 1650°C and subsequently solidified an increase in the grain size of the B2 phase and the separation of several phases with different morphologies along the grain boundaries are observed in the structure. The effect of high pressure on the alloy structure after quenching from the liquid phase is explored. The structure of the sample obtained upon solidification at a temperature of 1650°C under a pressure of 5 GPa is different from the structure of the alloy obtained at a temperature of 1650°C by arc melting. Under thermobaric conditions, a structure of mixed A1 (body-centered cubic) and A2 (face-centered cubic) phases is formed in the alloy. The alloy has high hardness, the value of which, depending on the selected production conditions, varies from 4.8 to 5.5 GPa.
期刊介绍：
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.
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