A. Odeshi, A. Tiamiyu, A. Khan, N. Katwal, D. Das, I. Oguocha
{"title":"AA 2099和AA 2624铝合金超细晶组织的发展","authors":"A. Odeshi, A. Tiamiyu, A. Khan, N. Katwal, D. Das, I. Oguocha","doi":"10.2139/ssrn.3339842","DOIUrl":null,"url":null,"abstract":"Abstract A study on the development of ultra-fine grained (UFG) structures in AA 2099-T8 and recently-developed AA 2624-T351 aluminum alloys was conducted using thermomechanical processing (TMP). Specimens were cryogenically-rolled to 70% thickness-reduction at −196 °C and artificially-aged at 200 °C, 250 °C, and 300 °C for times between 30 mins and 8 h. Analyses show that T1 (Al2CuLi) and δ′ (Al3Li) precipitates are dominant in AA 2099-T8 while AA 2624-T351 contains no precipitate. Upon cryo-rolling, hardness of AA 2099 decreased by ∼24%, while that of AA 2624 increased by ∼11%. The optimum ageing conditions for obtaining UFG structures in cryo-rolled AA 2099 and AA 2624 are 250 °C for 4 h and 250 °C for 1 h, respectively. It was found that dispersoids from the starting coarse-grained microstructure were inherited at every stage of TMP. New phase (S′) evolved in the interior of ultra-fine grains in AA 2624, while only T1 re-evolved in the UFG structure of AA 2099.","PeriodicalId":443021,"journal":{"name":"Engineering Educator: Courses","volume":"51 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":"{\"title\":\"Development of Ultra-Fine Grained Structure in AA 2099 and AA 2624 Aluminum Alloys\",\"authors\":\"A. Odeshi, A. Tiamiyu, A. Khan, N. Katwal, D. Das, I. Oguocha\",\"doi\":\"10.2139/ssrn.3339842\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Abstract A study on the development of ultra-fine grained (UFG) structures in AA 2099-T8 and recently-developed AA 2624-T351 aluminum alloys was conducted using thermomechanical processing (TMP). Specimens were cryogenically-rolled to 70% thickness-reduction at −196 °C and artificially-aged at 200 °C, 250 °C, and 300 °C for times between 30 mins and 8 h. Analyses show that T1 (Al2CuLi) and δ′ (Al3Li) precipitates are dominant in AA 2099-T8 while AA 2624-T351 contains no precipitate. Upon cryo-rolling, hardness of AA 2099 decreased by ∼24%, while that of AA 2624 increased by ∼11%. The optimum ageing conditions for obtaining UFG structures in cryo-rolled AA 2099 and AA 2624 are 250 °C for 4 h and 250 °C for 1 h, respectively. It was found that dispersoids from the starting coarse-grained microstructure were inherited at every stage of TMP. New phase (S′) evolved in the interior of ultra-fine grains in AA 2624, while only T1 re-evolved in the UFG structure of AA 2099.\",\"PeriodicalId\":443021,\"journal\":{\"name\":\"Engineering Educator: Courses\",\"volume\":\"51 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-02-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Engineering Educator: Courses\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.2139/ssrn.3339842\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Engineering Educator: Courses","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2139/ssrn.3339842","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Development of Ultra-Fine Grained Structure in AA 2099 and AA 2624 Aluminum Alloys
Abstract A study on the development of ultra-fine grained (UFG) structures in AA 2099-T8 and recently-developed AA 2624-T351 aluminum alloys was conducted using thermomechanical processing (TMP). Specimens were cryogenically-rolled to 70% thickness-reduction at −196 °C and artificially-aged at 200 °C, 250 °C, and 300 °C for times between 30 mins and 8 h. Analyses show that T1 (Al2CuLi) and δ′ (Al3Li) precipitates are dominant in AA 2099-T8 while AA 2624-T351 contains no precipitate. Upon cryo-rolling, hardness of AA 2099 decreased by ∼24%, while that of AA 2624 increased by ∼11%. The optimum ageing conditions for obtaining UFG structures in cryo-rolled AA 2099 and AA 2624 are 250 °C for 4 h and 250 °C for 1 h, respectively. It was found that dispersoids from the starting coarse-grained microstructure were inherited at every stage of TMP. New phase (S′) evolved in the interior of ultra-fine grains in AA 2624, while only T1 re-evolved in the UFG structure of AA 2099.
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