Large plasticity in magnesium mediated by pyramidal dislocations

Bo Yu Liu; Fei Liu; Nan Yang; Xiao Bo Zhai; Lei Zhang; Yang Yang; Bin Li; Ju Li; Evan Ma; Jian Feng Nie; Zhi Wei Shan

doi:10.1126/science.aaw2843

Large plasticity in magnesium mediated by pyramidal dislocations

Bo Yu Liu, Fei Liu, Nan Yang, Xiao Bo Zhai, Lei Zhang, Yang Yang, Bin Li, Ju Li, Evan Ma, Jian Feng Nie, Zhi Wei Shan

Materials Science & Engineering

Research output: Contribution to journal › Article › Research › peer-review

338 Citations (Scopus)

Abstract

Lightweight magnesium alloys are attractive as structural materials for improving energy efficiency in applications such as weight reduction of transportation vehicles. One major obstacle for widespread applications is the limited ductility of magnesium, which has been attributed to c + a dislocations failing to accommodate plastic strain.We demonstrate, using in situ transmission electron microscope mechanical testing, that c + a dislocations of various characters can accommodate considerable plasticity through gliding on pyramidal planes.We found that submicrometer-size magnesium samples exhibit high plasticity that is far greater than for their bulk counterparts. Small crystal size usually brings high stress, which in turn activates more c + a dislocations in magnesium to accommodate plasticity, leading to both high strength and good plasticity.

Original language	English
Pages (from-to)	73-75
Number of pages	3
Journal	Science
Volume	364
Issue number	6448
DOIs	https://doi.org/10.1126/science.aaw2843
Publication status	Published - 1 Jan 2019

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AU - Liu, Bo Yu

AU - Liu, Fei

AU - Yang, Nan

AU - Zhai, Xiao Bo

AU - Zhang, Lei

AU - Yang, Yang

AU - Li, Bin

AU - Li, Ju

AU - Ma, Evan

AU - Nie, Jian Feng

AU - Shan, Zhi Wei

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N2 - Lightweight magnesium alloys are attractive as structural materials for improving energy efficiency in applications such as weight reduction of transportation vehicles. One major obstacle for widespread applications is the limited ductility of magnesium, which has been attributed to c + a dislocations failing to accommodate plastic strain.We demonstrate, using in situ transmission electron microscope mechanical testing, that c + a dislocations of various characters can accommodate considerable plasticity through gliding on pyramidal planes.We found that submicrometer-size magnesium samples exhibit high plasticity that is far greater than for their bulk counterparts. Small crystal size usually brings high stress, which in turn activates more c + a dislocations in magnesium to accommodate plasticity, leading to both high strength and good plasticity.

AB - Lightweight magnesium alloys are attractive as structural materials for improving energy efficiency in applications such as weight reduction of transportation vehicles. One major obstacle for widespread applications is the limited ductility of magnesium, which has been attributed to c + a dislocations failing to accommodate plastic strain.We demonstrate, using in situ transmission electron microscope mechanical testing, that c + a dislocations of various characters can accommodate considerable plasticity through gliding on pyramidal planes.We found that submicrometer-size magnesium samples exhibit high plasticity that is far greater than for their bulk counterparts. Small crystal size usually brings high stress, which in turn activates more c + a dislocations in magnesium to accommodate plasticity, leading to both high strength and good plasticity.

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Large plasticity in magnesium mediated by pyramidal dislocations

Abstract

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