Liu Xingjun , Niu Zeming , Lu Yong , Guo Yihui , Han Jiajia , Chen Yuechao , Wang Cuiping
{"title":"Co-Nb-W体系热力学评价","authors":"Liu Xingjun , Niu Zeming , Lu Yong , Guo Yihui , Han Jiajia , Chen Yuechao , Wang Cuiping","doi":"10.1016/S1875-5372(18)30212-1","DOIUrl":null,"url":null,"abstract":"<div><p>The thermodynamic assessment of the Co-Nb-W ternary system has been carried out by applying the CALPHAD method. A slight modification of the Co-W binary system has been performed to unify the model of <em>μ</em> phase in Co-Nb-W system. The three published isothermal sections at 1273, 1373 and 1473 K have been critically examined and used to optimize the model parameters. The solution phases, including <em>α</em>Co and bcc were modeled as substitutional solutions; the <em>λ, χ</em>, and Co<sub>3</sub>Nb phases have been assessed using two-sublattice models. The Co<sub>7</sub>W<sub>6</sub> and Co<sub>7</sub>Nb<sub>6</sub> phases were described as (Co, Nb)<sub>1</sub>(Co, Nb, W)<sub>2</sub>(Co, Nb, W)<sub>4</sub>(Co)<sub>6</sub>. Calculated isothermal sections and vertical sections agreed well with the experimental data.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 10","pages":"Pages 2919-2926"},"PeriodicalIF":0.6000,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30212-1","citationCount":"1","resultStr":"{\"title\":\"Thermodynamic Assessment of Co-Nb-W System\",\"authors\":\"Liu Xingjun , Niu Zeming , Lu Yong , Guo Yihui , Han Jiajia , Chen Yuechao , Wang Cuiping\",\"doi\":\"10.1016/S1875-5372(18)30212-1\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The thermodynamic assessment of the Co-Nb-W ternary system has been carried out by applying the CALPHAD method. A slight modification of the Co-W binary system has been performed to unify the model of <em>μ</em> phase in Co-Nb-W system. The three published isothermal sections at 1273, 1373 and 1473 K have been critically examined and used to optimize the model parameters. The solution phases, including <em>α</em>Co and bcc were modeled as substitutional solutions; the <em>λ, χ</em>, and Co<sub>3</sub>Nb phases have been assessed using two-sublattice models. The Co<sub>7</sub>W<sub>6</sub> and Co<sub>7</sub>Nb<sub>6</sub> phases were described as (Co, Nb)<sub>1</sub>(Co, Nb, W)<sub>2</sub>(Co, Nb, W)<sub>4</sub>(Co)<sub>6</sub>. Calculated isothermal sections and vertical sections agreed well with the experimental data.</p></div>\",\"PeriodicalId\":21056,\"journal\":{\"name\":\"稀有金属材料与工程\",\"volume\":\"47 10\",\"pages\":\"Pages 2919-2926\"},\"PeriodicalIF\":0.6000,\"publicationDate\":\"2018-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30212-1\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"稀有金属材料与工程\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1875537218302121\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"稀有金属材料与工程","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1875537218302121","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
The thermodynamic assessment of the Co-Nb-W ternary system has been carried out by applying the CALPHAD method. A slight modification of the Co-W binary system has been performed to unify the model of μ phase in Co-Nb-W system. The three published isothermal sections at 1273, 1373 and 1473 K have been critically examined and used to optimize the model parameters. The solution phases, including αCo and bcc were modeled as substitutional solutions; the λ, χ, and Co3Nb phases have been assessed using two-sublattice models. The Co7W6 and Co7Nb6 phases were described as (Co, Nb)1(Co, Nb, W)2(Co, Nb, W)4(Co)6. Calculated isothermal sections and vertical sections agreed well with the experimental data.
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