Lowering the temperature for high strain rate superplasticity in an Al-Mg-Zn-Cu alloy via cooled friction stir processing
Lowering the temperature for high strain rate superplasticity in an Al-Mg-Zn-Cu alloy via cooled friction stir processing
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DOI：
10.1016/j.matchemphys.2013.06.055
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发表时间：
2013-10
影响因子：
4.6
通讯作者：
A. Orozco-Caballero;C. Cepeda-Jiménez;P. Hidalgo-Manrique;P. Rey;D. Gesto;D. Verdera;O. Ruano;F. Carreño
中科院分区：
文献类型：
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作者：
A. Orozco-Caballero;C. Cepeda-Jiménez;P. Hidalgo-Manrique;P. Rey;D. Gesto;D. Verdera;O. Ruano;F. Carreño
在两种不同的冷却速度下，对Al-Zn-Mg-Cu合金在两种不同的背砧上进行了搅拌摩擦加工。在最高冷却速率下加工可获得更细的晶粒尺寸，分别为0.3 μ m和0.5 μm。两种材料均表现出超塑性行为，最大断裂伸长率约为510%。晶界滑移是主要的变形机制。此外，晶粒尺寸更细的材料在10−2s−1的应变速率下，在低至250 °C的较低温度下表现出高应变速率超塑性。
An Al–Zn–Mg–Cu alloy was friction stir processed over two kinds of backing anvils, at two different cooling rates. A finer grain size, 0.3 vs 0.5 μm, was obtained by processing at the highest cooling rate. Both materials showed superplastic behavior with a maximum elongation to fracture of about 510%. Grain boundary sliding was the operative deformation mechanism. Furthermore, the finer grain size material showed high strain rate superplasticity, at 10−2s−1, at lower temperatures, as low as 250 °C.