Nanostructural hierarchy increases the strength of aluminium alloys
Nanostructural hierarchy increases the strength of aluminium alloys
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DOI：
10.1038/ncomms1062
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发表时间：
2010-09-01
影响因子：
16.6
通讯作者：
Ringer, Simon P.
中科院分区：
文献类型：
--
作者：
Liddicoat, Peter V.;Liao, Xiao-Zhou;Ringer, Simon P.
在保持可成形性的同时提高金属合金的强度是实现新一代轻质结构和技术的有趣挑战。在本文中，我们设计的铝合金包含一个层次的纳米结构，并具有机械性能，扩大已知的性能边界航空级7075合金表现出屈服强度和均匀伸长率接近1 GPa和5%，分别。使用新的高分辨率显微镜技术观察到的纳米结构的架构，并包括一个固溶体，无沉淀，具有（i）高密度的位错，（ii）亚纳米晶内溶质簇，（iii）两种几何形状的纳米级晶间溶质结构和（iv）晶粒尺寸几十纳米的直径。我们的研究结果表明，这种新的架构提供了一个设计途径，走向新一代的超强材料与新制度的性能空间。
Increasing the strength of metallic alloys while maintaining formability is an interesting challenge for enabling new generations of lightweight structures and technologies. In this paper, we engineer aluminium alloys to contain a hierarchy of nanostructures and possess mechanical properties that expand known performance boundaries-an aerospace-grade 7075 alloy exhibits a yield strength and uniform elongation approaching 1 GPa and 5 %, respectively. The nanostructural architecture was observed using novel high-resolution microscopy techniques and comprises a solid solution, free of precipitation, featuring (i) a high density of dislocations, (ii) subnanometre intragranular solute clusters, (iii) two geometries of nanometre-scale intergranular solute structures and (iv) grain sizes tens of nanometres in diameter. Our results demonstrate that this novel architecture offers a design pathway towards a new generation of super-strong materials with new regimes of property-performance space.