Achieving high strength and toughness in a Zr–2.3Nb alloy by the formation of duplex microstructure
Achieving high strength and toughness in a Zr–2.3Nb alloy by the formation of duplex microstructure
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DOI：
10.1016/j.matdes.2012.04.012
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发表时间：
2012-09
影响因子：
8.4
通讯作者：
Zhi-nan Yang;F. Zhang;Fengchao Liu;Zhigang Yan;Y. Xiao
中科院分区：
文献类型：
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作者：
Zhi-nan Yang;F. Zhang;Fengchao Liu;Zhigang Yan;Y. Xiao
在Zr-2.3Nb合金中获得了双相显微组织，其与起始魏氏合金显微组织相比显示出改善的强度和韧性。通过塑性变形和随后不少于30 min的再结晶退火产生双态组织。空冷是再结晶过程后的一个重要因素。该复合组织不仅具有高抗拉强度（~ 746 MPa）、高延伸率（~ 16%）、高静态韧性（~ 119 MJ/m3）等优异的静态力学性能，而且具有高动态冲击韧性（~ 134 J/cm ~ 2），是魏氏组织（~ 48 J/cm ~ 2）的近3倍。拉伸和冲击断裂过程中裂纹扩展均为韧性韧窝特征，表现出良好的静态和冲击韧性。
A duplex microstructure, which displays improved strength and toughness compared with a starting Widmanstätten microstructure, was obtained in a Zr–2.3Nb alloy. The duplex microstructure was generated via plastic deformation and subsequent recrystallization annealing for no less than 30min. Air cooling was an important factor after the recrystallization process. The duplex microstructure possesses not only excellent static mechanical properties of high tensile strength (∼746MPa), high elongation (∼16%), and high static toughness (∼119MJ/m3), but also high dynamic impact toughness (∼134J/cm2) which was nearly three times as great as that of the Widmanstätten microstructure (∼48J/cm2). The crack propagation during tension and impact fracture of the duplex microstructure are both in a ductile dimple feature, revealing an excellent static and impact toughness.