| Effect of Rare Earth Cerium on Yield Strength Anisotropy of Al-Li Alloy Sheet and Its Theoretical Prediction |
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| 作者姓名： | 赵志龙 刘林 陈铮 |
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| 作者单位： | College of Electromechanical Engineering，Northwestern Polytechnic University，Xi′an 710072，China，College of Electromechanical Engineering，Northwestern Polytechnic University，Xi′an 710072，China，College of Electromechanical Engineering，Northwestern Polytechnic University，Xi′an 710072，China |
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| 摘 要： | Traceadditionofrareearthinto 2 0 90Al Lialloyisoneofthemeasurestoimproveitslowductilityandtoughness .Al Lialloysheetwithstrongcrystallo graphictexturehasbeenknowntohaveunusuallyhigheryieldstrengthanisotropythanconventionalalu minumalloys1～3] .However ,ithasnotbeennormallyrecognizedsofarabouttheeffectofceriumonthisanisotropyofAl Lialloy .Someinvestigationsonheat treatableAl Lialloysshowthattheyieldstrengthanisotropyof 2 0 90sheetalloyisdefinitelyassociatedwiththevolumefractionofT1precipita…
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| 关 键 词： | 强度各向异性 Al-Li合金 铝合金 稀土 变形织构 XRD 铈 |
Effect of Rare Earth Cerium on Yield Strength Anisotropy of Al-Li Alloy Sheet and Its Theoretical Prediction |
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| Zhao Zhilong,Liu Lin,Chen Zheng.Effect of Rare Earth Cerium on Yield Strength Anisotropy of Al-Li Alloy Sheet and Its Theoretical Prediction[J].Journal of Rare Earths,2004,22(3):410-413. |
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| Authors: | Zhao Zhilong Liu Lin Chen Zheng |
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| Abstract: | The variation of yield strength along rolling direction, transverse direction and 45° to transverse direction of 2090 Al-Li alloy and 2090 Ce alloy sheet containing rare earth cerium was comparatively investigated. The difference of deformation texture in these two alloy sheets was analyzed by means of X-ray orientation distribution function (ODF). The results show that cerium has the effects of enhancing the Brass and S rolling texture components and reducing the recrystallized texture components of Cube and Goss. This is the reason that the anisotropic degree of yield strength in 2090 Ce sheet is higher than that of 2090 alloy sheet. The prediction of yield strength along various orientations in two alloy sheets was done based on Taylor/Bishop-Hill model, and the strengthening effect of grain boundary was evaluated using Hall-Petch relationship. A modified plastic inclusion model was proposed using the concept of grain-orientation factor and T1 phase orientation factor by fitting with tensile test results. |
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| Keywords: | metal materials Al-Li alloy deformation texture anisotropy orientation factors rare earths |
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