Achieve high ductility and strength in an Al–Mg alloy by severe plastic deformation combined with inter-pass annealing
Achieve high ductility and strength in an Al–Mg alloy by severe plastic deformation combined with inter-pass annealing
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DOI：
10.1016/j.msea.2013.12.103
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发表时间：
2014-03
期刊：
影响因子：
6.4
通讯作者：
M. Zha;Yanjun Li;R. Mathiesen;R. Bjørge;H. Roven
中科院分区：
文献类型：
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作者：
M. Zha;Yanjun Li;R. Mathiesen;R. Bjørge;H. Roven
剧烈塑性变形的金属材料通常具有很高的强度，但均匀伸长率很低，通常<5%。采用室温等径角挤压结合道间退火的方法制备Al-7Mg合金，获得了高延展性（伸长率~14.5%）和高强度（UTS~600 MPa）的优异组合。明显的动态应变时效效应和双峰型晶粒组织导致的强化加工硬化使其具有较高的塑性。高强度主要是由于晶粒细化明显，位错密度高。
Metallic materials processed by severe plastic deformation generally possess very high strength but a rather low uniform elongation, usually <5%. In the present Al–7Mg alloy processed by room temperature equal channel angular pressing combined with inter-pass annealing, impressive combination of high ductility (elongation~14.5%) and high strength (UTS~600 MPa) was achieved. The high ductility was rationalized by an enhanced work hardening originated from the pronounced dynamic strain aging effect and a bimodal grain structure. The high strength was mainly due to a prominent grain refinement and high dislocation density.