Strategy for severe friction stir processing to obtain acute grain refinement of an Al-Zn-Mg-Cu alloy in three initial precipitation states
Strategy for severe friction stir processing to obtain acute grain refinement of an Al-Zn-Mg-Cu alloy in three initial precipitation states
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DOI：
10.1016/j.matchar.2015.12.014
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发表时间：
2016-02
影响因子：
4.7
通讯作者：
A. Orozco-Caballero;P. Hidalgo-Manrique;C. Cepeda-Jiménez;P. Rey;D. Verdera;O. Ruano;F. Carreño
中科院分区：
文献类型：
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作者：
A. Orozco-Caballero;P. Hidalgo-Manrique;C. Cepeda-Jiménez;P. Rey;D. Verdera;O. Ruano;F. Carreño
使用多种加工条件、两种不同的背衬砧和三种初始沉淀状态对 Al-Zn-Mg-Cu、Al 7075 合金进行搅拌摩擦加工 (FSP)，以达到最大可行的加工强度，产生超细晶粒尺寸。获得了由细小、等轴和高度错误取向的晶粒形成的微观结构。晶粒尺寸在 200–1000 nm 范围内，使得 FSP 与其他严重塑性变形技术相比具有竞争力。未观察到初始沉淀状态对加工晶粒尺寸的影响。事实上，加工条件和冷却速率决定了观察到的晶粒尺寸。研究发现，选择适当的加工条件可产生超细晶粒尺寸，从而实现适当的微观结构控制。
An Al–Zn–Mg–Cu, Al 7075, alloy was subjected to friction stir processing (FSP) using several processing conditions, two different backing anvils and three initial precipitation states in order to reach the maximum feasible processing severity to produce ultrafine grain sizes. Microstructures formed by fine, equiaxed and highly misoriented grains were obtained. Grain sizes were situated in the range of 200–1000 nm, making FSP competitive with other severe plastic deformation techniques. No influence of the initial precipitation state in the processed grain size was perceived. In fact, the processing conditions and the cooling rate determine the observed grain size. It was found that the selection of the appropriate processing conditions delivered an ultrafine grain size, thus allowing suitable microstructural control.