Improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energy

Gradient structures were introduced via torsional treatment to Cu and CuAl alloys with different starting grain sizes and stacking fault energies (SFEs). Systematic investigations showed that the original grain sizes and SFEs of these materials play vital roles in affecting the formation of gradien...

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Main Authors:	Ji Gu, Lixin Zhang, Yahui Tang, Min Song, Song Ni, Xianghai An, Yong Du, Zhou Li, Xiaozhou Liao
Format:	Article
Language:	English
Published:	Elsevier 2018-12-01
Series:	Materials & Design
Online Access:	http://www.sciencedirect.com/science/article/pii/S0264127518306750

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spelling	doaj-31f6f20f7d2b48618f0fd8539c7456af2020-11-25T00:37:08ZengElsevierMaterials & Design0264-12752018-12-011602133Improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energyJi Gu0Lixin Zhang1Yahui Tang2Min Song3Song Ni4Xianghai An5Yong Du6Zhou Li7Xiaozhou Liao8State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China; Corresponding authors.State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR ChinaSchool of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney 2006, NSW, AustraliaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR ChinaSchool of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney 2006, NSW, Australia; Corresponding authors.Gradient structures were introduced via torsional treatment to Cu and CuAl alloys with different starting grain sizes and stacking fault energies (SFEs). Systematic investigations showed that the original grain sizes and SFEs of these materials play vital roles in affecting the formation of gradient structures and their corresponding mechanical properties. Large grain size and relatively low SFE are two critical requirements for the formation of the optimum gradient structure. A superior combination of high strength and good ductility can be achieved by torsional treatment in ultra-coarse-grained materials with low SFEs, which is attributed to the hierarchical structures that led to the simultaneous activations of different deformation mechanisms from full dislocation activities to partial dislocation slip and nano-twinning along the radial direction. Keywords: Gradient structure, Strength, Ductility, Twinning, Stacking fault energyhttp://www.sciencedirect.com/science/article/pii/S0264127518306750
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Ji Gu Lixin Zhang Yahui Tang Min Song Song Ni Xianghai An Yong Du Zhou Li Xiaozhou Liao
spellingShingle	Ji Gu Lixin Zhang Yahui Tang Min Song Song Ni Xianghai An Yong Du Zhou Li Xiaozhou Liao Improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energy Materials & Design
author_facet	Ji Gu Lixin Zhang Yahui Tang Min Song Song Ni Xianghai An Yong Du Zhou Li Xiaozhou Liao
author_sort	Ji Gu
title	Improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energy
title_short	Improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energy
title_full	Improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energy
title_fullStr	Improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energy
title_full_unstemmed	Improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energy
title_sort	improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energy
publisher	Elsevier
series	Materials & Design
issn	0264-1275
publishDate	2018-12-01
description	Gradient structures were introduced via torsional treatment to Cu and CuAl alloys with different starting grain sizes and stacking fault energies (SFEs). Systematic investigations showed that the original grain sizes and SFEs of these materials play vital roles in affecting the formation of gradient structures and their corresponding mechanical properties. Large grain size and relatively low SFE are two critical requirements for the formation of the optimum gradient structure. A superior combination of high strength and good ductility can be achieved by torsional treatment in ultra-coarse-grained materials with low SFEs, which is attributed to the hierarchical structures that led to the simultaneous activations of different deformation mechanisms from full dislocation activities to partial dislocation slip and nano-twinning along the radial direction. Keywords: Gradient structure, Strength, Ductility, Twinning, Stacking fault energy
url	http://www.sciencedirect.com/science/article/pii/S0264127518306750
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Improving the strength and retaining the ductility of microstructural graded coarse-grained materials with low stacking fault energy

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