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Ultrahigh-strength and ductile superlattice alloys with nanoscale disordered interfaces.
Science ( IF 56.9 ) Pub Date : 2020-07-24 , DOI: 10.1126/science.abb6830
T Yang 1, 2 , Y L Zhao 1, 3 , W P Li 3 , C Y Yu 4 , J H Luan 3 , D Y Lin 5 , L Fan 6 , Z B Jiao 6 , W H Liu 7 , X J Liu 7, 8 , J J Kai 1, 3 , J C Huang 2, 3 , C T Liu 1, 2, 3
Affiliation  

Alloys that have high strengths at high temperatures are crucial for a variety of important industries including aerospace. Alloys with ordered superlattice structures are attractive for this purpose but generally suffer from poor ductility and rapid grain coarsening. We discovered that nanoscale disordered interfaces can effectively overcome these problems. Interfacial disordering is driven by multielement cosegregation that creates a distinctive nanolayer between adjacent micrometer-scale superlattice grains. This nanolayer acts as a sustainable ductilizing source, which prevents brittle intergranular fractures by enhancing dislocation mobilities. Our superlattice materials have ultrahigh strengths of 1.6 gigapascals with tensile ductilities of 25% at ambient temperature. Simultaneously, we achieved negligible grain coarsening with exceptional softening resistance at elevated temperatures. Designing similar nanolayers may open a pathway for further optimization of alloy properties.



中文翻译:

具有纳米级无序界面的超高强度和韧性超晶格合金。

在高温下具有高强度的合金对于包括航空航天在内的许多重要行业都至关重要。具有有序超晶格结构的合金为此目的是有吸引力的,但是通常具有延展性差和晶粒粗化迅速的缺点。我们发现纳米级无序界面可以有效地克服这些问题。界面无序是由多元素共偏析驱动的,该元素在相邻的微米级超晶格晶粒之间形成了独特的纳米层。该纳米层充当可持续的延展性来源,可通过提高位错活动性来防止脆性晶间骨折。我们的超晶格材料具有1.6吉帕的超高强度,在环境温度下的拉伸延展性为25%。同时,在高温下,我们实现了可忽略的晶粒粗化,并具有出色的抗软化性。设计相似的纳米层可以为进一步优化合金性能开辟道路。

更新日期:2020-07-24
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