The 1.85 GPa AlSc Bulk Alloy with Abundant Nanoscale Growth Twins

Long Chao Zhuo; Shu Hua Liang; Tao Zhang

doi:10.1088/0256-307X/32/7/076401

The 1.85 GPa AlSc Bulk Alloy with Abundant Nanoscale Growth Twins

Long Chao Zhuo^*
, Shu Hua Liang
, Tao Zhang

^*Corresponding author for this work

School of Materials Science and Engineering

Xi'an University of Technology
Tsinghua University

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

3 Scopus citations

Abstract

An in situ ultrahigh-strength ductile Al₅₀Sc₅₀ bulk alloy is produced by the copper mold casting method with a composite microstructure of micron-/submicron-sized grains and nanoscale twins. According to the microstructural investigations, hierarchical nanotwinned lamellar AlSc bundles with embedded micron-/submicron-sized Al₂Sc and AlS₂ are observed. The as-cast alloy displays a unique act of ultrahigh strength of ∼1.85 GPa together with pronounced work hardening and a large plasticity of ∼14%. Further microstructural investigations on deformed specimens indicate that abundant hierarchical nanotwinned lamellar AlSc bundles are effective to dissipate localization of shear stress or block dislocations from spreading throughout the alloy and hinder the propagation of microcracks formed by local stress transition.

Original language	English
Article number	076401
Journal	Chinese Physics Letters
Volume	32
Issue number	7
DOIs	https://doi.org/10.1088/0256-307X/32/7/076401
State	Published - 1 Jul 2015

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title = "The 1.85 GPa AlSc Bulk Alloy with Abundant Nanoscale Growth Twins",

abstract = "An in situ ultrahigh-strength ductile Al50Sc50 bulk alloy is produced by the copper mold casting method with a composite microstructure of micron-/submicron-sized grains and nanoscale twins. According to the microstructural investigations, hierarchical nanotwinned lamellar AlSc bundles with embedded micron-/submicron-sized Al2Sc and AlS2 are observed. The as-cast alloy displays a unique act of ultrahigh strength of ∼1.85 GPa together with pronounced work hardening and a large plasticity of ∼14\%. Further microstructural investigations on deformed specimens indicate that abundant hierarchical nanotwinned lamellar AlSc bundles are effective to dissipate localization of shear stress or block dislocations from spreading throughout the alloy and hinder the propagation of microcracks formed by local stress transition.",

author = "Zhuo, \{Long Chao\} and Liang, \{Shu Hua\} and Tao Zhang",

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AU - Zhuo, Long Chao

AU - Liang, Shu Hua

AU - Zhang, Tao

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N2 - An in situ ultrahigh-strength ductile Al50Sc50 bulk alloy is produced by the copper mold casting method with a composite microstructure of micron-/submicron-sized grains and nanoscale twins. According to the microstructural investigations, hierarchical nanotwinned lamellar AlSc bundles with embedded micron-/submicron-sized Al2Sc and AlS2 are observed. The as-cast alloy displays a unique act of ultrahigh strength of ∼1.85 GPa together with pronounced work hardening and a large plasticity of ∼14%. Further microstructural investigations on deformed specimens indicate that abundant hierarchical nanotwinned lamellar AlSc bundles are effective to dissipate localization of shear stress or block dislocations from spreading throughout the alloy and hinder the propagation of microcracks formed by local stress transition.

AB - An in situ ultrahigh-strength ductile Al50Sc50 bulk alloy is produced by the copper mold casting method with a composite microstructure of micron-/submicron-sized grains and nanoscale twins. According to the microstructural investigations, hierarchical nanotwinned lamellar AlSc bundles with embedded micron-/submicron-sized Al2Sc and AlS2 are observed. The as-cast alloy displays a unique act of ultrahigh strength of ∼1.85 GPa together with pronounced work hardening and a large plasticity of ∼14%. Further microstructural investigations on deformed specimens indicate that abundant hierarchical nanotwinned lamellar AlSc bundles are effective to dissipate localization of shear stress or block dislocations from spreading throughout the alloy and hinder the propagation of microcracks formed by local stress transition.

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DO - 10.1088/0256-307X/32/7/076401

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JO - Chinese Physics Letters

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The 1.85 GPa AlSc Bulk Alloy with Abundant Nanoscale Growth Twins

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