Tensile behavior of bulk nanostructured and ultrafine grained aluminum alloys
Tensile behavior of bulk nanostructured and ultrafine grained aluminum alloys
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大块纳米结构和超细晶铝合金的拉伸行为
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
E. Lavernia
中科院分区：
文献类型：
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作者：
B. Han;F. Mohamed;E. Lavernia
在本研究中，分析了通过机械研磨粉末固结和严重塑性变形加工的块体纳米结构铝合金的拉伸行为数据。在大块纳米结构和超细晶粒铝合金中观察到高强度和低应变硬化。铝合金的延展性随着晶粒尺寸的减小而降低。当晶粒尺寸小于 100 nm 时，大量的晶间成分可能会对块体纳米结构材料的拉伸性能产生影响。大块纳米结构铝镁合金的高强度可能归因于晶粒尺寸强化、高位错密度的存在、奥罗万强化、沉淀硬化和固溶硬化。低温铣削铝合金的应力-应变曲线中的大且突然的应力下降很可能表明弥散体的强钉扎作用附近或脱离了位错湮灭。
In the present study, data on tensile behavior of bulk nanostructured aluminum alloys processed via consolidation of mechanically milled powders and severe plastic deformation are analyzed. High strength and low strain hardening were observed in bulk nanostructured and ultrafine-grained Al alloys. The ductility of aluminum alloys decreases with decreasing grain size. The high amount of intercrystalline components may have an influence on tensile properties of bulk nanostructured materials when grain sizes are less than 100 nm. The high strength in bulk nanostructured Al-Mg alloy may be attributed to contributions arising from grain size strengthening, the presence of high dislocation densities, Orowan strengthening, precipitation hardening and solid-solution hardening. The large and sudden stress drops in the stress-strain curves of cryomilled Al alloys are most probably indicative of the dislocation annihilation in the vicinity of or breakaway from the strong pinning role of dispersoids.