Multiplicity of dislocation pathways in a refractory multiprincipal element alloy

doi:10.1126/science.aba3722

GSTDTAP > 气候变化

DOI	10.1126/science.aba3722
	Multiplicity of dislocation pathways in a refractory multiprincipal element alloy
	Fulin Wang; Glenn H. Balbus; Shuozhi Xu; Yanqing Su; Jungho Shin; Paul F. Rottmann; Keith E. Knipling; Jean-Charles Stinville; Leah H. Mills; Oleg N. Senkov; Irene J. Beyerlein; Tresa M. Pollock; Daniel S. Gianola
	2020-10-02
发表期刊	Science
出版年	2020
英文摘要	Alloys containing multiple elements can be very strong but often suffer from poor ductility. F. Wang et al. found that different mechanisms accommodated plasticity in a molybdenum-niobium-titanium multiprincipal element alloy (see the Perspective by Cairney). Instead of so-called “screw” dislocations, deformation is accommodated by multiple pathways that include “edge” dislocations and activation of crystallographic slip planes. These results offer a design paradigm for developing new high-strength alloys. Science , this issue p. [95][1]; see also p. [37][2] Refractory multiprincipal element alloys (MPEAs) are promising materials to meet the demands of aggressive structural applications, yet require fundamentally different avenues for accommodating plastic deformation in the body-centered cubic (bcc) variants of these alloys. We show a desirable combination of homogeneous plastic deformability and strength in the bcc MPEA MoNbTi, enabled by the rugged atomic environment through which dislocations must navigate. Our observations of dislocation motion and atomistic calculations unveil the unexpected dominance of nonscrew character dislocations and numerous slip planes for dislocation glide. This behavior lends credence to theories that explain the exceptional high temperature strength of similar alloys. Our results advance a defect-aware perspective to alloy design strategies for materials capable of performance across the temperature spectrum. [1]: /lookup/doi/10.1126/science.aba3722 [2]: /lookup/doi/10.1126/science.abd6587
领域	气候变化 ; 资源环境
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引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/298058
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Fulin Wang,Glenn H. Balbus,Shuozhi Xu,et al. Multiplicity of dislocation pathways in a refractory multiprincipal element alloy[J]. Science,2020.
APA	Fulin Wang.,Glenn H. Balbus.,Shuozhi Xu.,Yanqing Su.,Jungho Shin.,...&Daniel S. Gianola.(2020).Multiplicity of dislocation pathways in a refractory multiprincipal element alloy.Science.
MLA	Fulin Wang,et al."Multiplicity of dislocation pathways in a refractory multiprincipal element alloy".Science (2020).