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Excellent combination of strength and ductility of Al-1.2Mn alloy with multi-scale lamellar structure
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2018-05-26 , DOI: 10.1016/j.msea.2018.05.101
X.P. Chen , S. Li , L. Mei , P. Ren , Q. Liu

By the method of cold rolling, appropriate intermediate annealing and final annealing treatments, the multi-scale lamellar structure of ultrafine grains distributed in ribbons with coarse grains was produced in an Al-1.2Mn alloy, which displayed excellent combination of high strength and good ductility compared to coarse-grained and ultrafine-grained alloys. The high strength of the alloy with multi-scale lamellar structure is attributed to back stress strengthening associated with the formation of geometrically necessary dislocations and the good ductility results from the high strain hardening rate during plastic deformation. Loading-unloading-reloading tests were carried out to measure the back stresses of the alloys. The results show that the back stress of the specimen with multi-scale lamellar structure is much higher than that of the coarse-grained specimen.



中文翻译:

具有多尺度层状结构的Al-1.2Mn合金的强度和延展性完美结合

通过冷轧,适当的中间退火和最终退火处理的方法,在Al-1.2Mn合金中产生了分布在粗晶粒带中的超细晶粒的多尺度层状结构,显示出高强度和良好延展性的优异结合。与粗晶粒和超细晶粒合金相比。具有多尺度层状结构的合金的高强度归因于与形成几何上必要的位错相关联的背应力增强,并且由于塑性变形期间的高应变硬化率而具有良好的延展性。进行了加载-卸载-重新加载测试以测量合金的背应力。

更新日期:2018-05-26
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