突破霍尔·佩奇极限：世界上强度最高的导电用银合金被制造出来

最新评论

巧克力 2019-10-03 23:25

极限都可以被突破的吗，厉害。。。。

lufan 2019-10-04 00:04

世界上强度最高的导电用银合金被制造出来

dushunli 2019-10-04 00:17

银合金的力量！

tassy 2019-10-04 00:47

缺陷是金属不可避免的一部分

bairuizheng 2019-10-04 01:07

这些人的信念好坚定啊。

mang2004 2019-10-04 04:04

Ideal maximum strengths and defect-induced softening in nanocrystalline-nanotwinned metals (w/T-*  
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Strengthening of metals through nanoscale grain boundaries and coherent twin boundaries is manifested by a maximum strength—a phenomenon known as Hall–Petch breakdown. Different softening mechanisms are considered to occur for nanocrystalline and nanotwinned materials. Here, we report nanocrystalline-nanotwinned Ag materials that exhibit two strength transitions dissimilar from the above mechanisms. Atomistic simulations show three distinct strength regions as twin spacing decreases, delineated by positive Hall–Petch strengthening to grain-boundary-dictated (near-zero Hall–Petch slope) mechanisms and to softening (negative Hall–Petch slope) induced by twin-boundary defects. An ideal maximum strength is reached for a range of twin spacings below 7 nm. We synthesized nanocrystalline-nanotwinned Ag with hardness 3.05 GPa—42% higher than the current record, by segregating trace concentrations of Cu impurity (<1.0 weight (wt)%). The microalloy retains excellent electrical conductivity and remains stable up to 653 K; 215 K better than for pure nanotwinned Ag. This breaks the existing trade-off between strength and electrical conductivity, and demonstrates the potential for creating interface-dominated materials with unprecedented mechanical and physical properties. ]cZ!y ~  
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刘明欢聪慧 2019-10-04 06:16

霍尔·佩奇（Hall-Petch）效应是70多年来材料科学的标志性学说，这一理论认为随着金属晶粒变小，材料本身也会变得更坚固，但是有一个限制：当晶粒变得太小（几纳米宽）时，它们的边界变得不稳定，材料会再次软化。

redplum 2019-10-04 07:39

突破霍尔·佩奇极限：世界上强度最高的导电用银合金被制造出来

likaihit 2019-10-04 08:03

真牛逼啊

daite1978 2019-10-04 08:11

银合金的力量！