Deformation mechanisms in ultrahigh-strength and high-ductility nanostructured FeMnAlC alloy

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• 作者：Chih-Lung Lin ; Chuen-Guang Chao ; Jenh-Yih Juang ; Jenn-Ming Yang ; Tzeng-Feng Liu
• 关键词：Metals and alloys ; Nanostructured materials ; Lightweight alloy ; Spinodal decomposition ; Bursting dislocation nucleation ; Taylor lattice
• 刊名：Journal of Alloys and Compounds
• 出版年：15 February, 2014
• 年：2014
• 卷：586
• 期：Complete
• 页码：616-620
• 全文大小：2702 K

文摘

The deformation mechanisms of a bulk nanostructured Fe-30Mn-9.5Al-2.0C (in wt.%) alloy were investigated. After aging at 450 掳C for 9-12 h, the alloy exhibits an exceptional strength-ductility combination (e.g. yield strength 鈭?406 MPa with elongation 鈭?2%). The aged alloy exhibits a novel microstructure with isolated austenite nano-channels bounded by an extremely high volume fraction of directional nano-sized (Fe,Mn)₃AlC carbides (魏鈥?carbides). The plastic deformation was found to be dominated by bursting dislocation nucleation within the isolated austenite nano-channels.