Microstructure control and ductility improvement of La-Al-(Cu, Ni) composites by Bridgman solidification

Y. Zhang; W. Xu; H. Tan; Y. Li

doi:10.1016/j.actamat.2005.02.020

Microstructure control and ductility improvement of La-Al-(Cu, Ni) composites by Bridgman solidification

Y. Zhang^*, W. Xu, H. Tan, Y. Li

^*Corresponding author for this work

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

68 Citations (Scopus)

Abstract

Microstructure evolutions were experimentally studied as a function of growth velocity and alloy composition in La_xAl₁₄(Cu, Ni)_{86 - x} alloys (x = 57-74). The composition-velocity ranges were determined for the formation of eutectic, amorphous, eutectic + compound, amorphous + dendrite, and eutectic + dendrite. A skewed eutectic coupled zone was found towards the compound phase. A composite structure composed of ductile La dendrites in a matrix of either eutectic or amorphous phase can be produced in hypoeutectic alloys. Compressive tests were performed on amorphous/dendrite and eutectic/dendrite composites. As the volume fraction of dendrites increases, fracture strength linearly decreases and obeys a rule-of-mixtures relationship, whereas plastic strain exhibits an exponential increase. Optimised mechanical properties can be realized through both alloy composition design and well-controlled solidification processing.

Original language	English
Pages (from-to)	2607-2616
Number of pages	10
Journal	Acta Materialia
Volume	53
Issue number	9
DOIs	https://doi.org/10.1016/j.actamat.2005.02.020
Publication status	Published - May 2005
Externally published	Yes

Keywords

Bridgman solidification
Bulk metallic glass
Composite
Eutectic
La based alloy

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10.1016/j.actamat.2005.02.020

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title = "Microstructure control and ductility improvement of La-Al-(Cu, Ni) composites by Bridgman solidification",

abstract = "Microstructure evolutions were experimentally studied as a function of growth velocity and alloy composition in LaxAl14(Cu, Ni)86 - x alloys (x = 57-74). The composition-velocity ranges were determined for the formation of eutectic, amorphous, eutectic + compound, amorphous + dendrite, and eutectic + dendrite. A skewed eutectic coupled zone was found towards the compound phase. A composite structure composed of ductile La dendrites in a matrix of either eutectic or amorphous phase can be produced in hypoeutectic alloys. Compressive tests were performed on amorphous/dendrite and eutectic/dendrite composites. As the volume fraction of dendrites increases, fracture strength linearly decreases and obeys a rule-of-mixtures relationship, whereas plastic strain exhibits an exponential increase. Optimised mechanical properties can be realized through both alloy composition design and well-controlled solidification processing.",

keywords = "Bridgman solidification, Bulk metallic glass, Composite, Eutectic, La based alloy",

author = "Y. Zhang and W. Xu and H. Tan and Y. Li",

year = "2005",

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doi = "10.1016/j.actamat.2005.02.020",

language = "English",

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TY - JOUR

T1 - Microstructure control and ductility improvement of La-Al-(Cu, Ni) composites by Bridgman solidification

AU - Zhang, Y.

AU - Xu, W.

AU - Tan, H.

AU - Li, Y.

PY - 2005/5

Y1 - 2005/5

N2 - Microstructure evolutions were experimentally studied as a function of growth velocity and alloy composition in LaxAl14(Cu, Ni)86 - x alloys (x = 57-74). The composition-velocity ranges were determined for the formation of eutectic, amorphous, eutectic + compound, amorphous + dendrite, and eutectic + dendrite. A skewed eutectic coupled zone was found towards the compound phase. A composite structure composed of ductile La dendrites in a matrix of either eutectic or amorphous phase can be produced in hypoeutectic alloys. Compressive tests were performed on amorphous/dendrite and eutectic/dendrite composites. As the volume fraction of dendrites increases, fracture strength linearly decreases and obeys a rule-of-mixtures relationship, whereas plastic strain exhibits an exponential increase. Optimised mechanical properties can be realized through both alloy composition design and well-controlled solidification processing.

AB - Microstructure evolutions were experimentally studied as a function of growth velocity and alloy composition in LaxAl14(Cu, Ni)86 - x alloys (x = 57-74). The composition-velocity ranges were determined for the formation of eutectic, amorphous, eutectic + compound, amorphous + dendrite, and eutectic + dendrite. A skewed eutectic coupled zone was found towards the compound phase. A composite structure composed of ductile La dendrites in a matrix of either eutectic or amorphous phase can be produced in hypoeutectic alloys. Compressive tests were performed on amorphous/dendrite and eutectic/dendrite composites. As the volume fraction of dendrites increases, fracture strength linearly decreases and obeys a rule-of-mixtures relationship, whereas plastic strain exhibits an exponential increase. Optimised mechanical properties can be realized through both alloy composition design and well-controlled solidification processing.

KW - Bridgman solidification

KW - Bulk metallic glass

KW - Composite

KW - Eutectic

KW - La based alloy

UR - https://www.scopus.com/pages/publications/17644393125

U2 - 10.1016/j.actamat.2005.02.020

DO - 10.1016/j.actamat.2005.02.020

M3 - Article

AN - SCOPUS:17644393125

SN - 1359-6454

VL - 53

SP - 2607

EP - 2616

JO - Acta Materialia

JF - Acta Materialia

IS - 9

ER -

Microstructure control and ductility improvement of La-Al-(Cu, Ni) composites by Bridgman solidification

Abstract

Keywords

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