Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP

B. Li; S. Joshi; K. Azevedo; E. Ma; K. T. Ramesh; R. B. Figueiredo; T. G. Langdon

doi:10.1016/j.msea.2009.03.032

Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP

B. Li
, S. Joshi
, K. Azevedo
, E. Ma
, K. T. Ramesh
, R. B. Figueiredo
, T. G. Langdon

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

113 Scopus citations

Abstract

A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) at 473 K to produce a grain size of ∼0.8 μm and it was then tested under dynamic conditions at strain rates up to 4.0 × 10³ s^-1 using a split-Hopkinson bar. The stress-strain curves in dynamic testing exhibited upwards concave curvature suggesting the occurrence of twinning. Examination by transmission electron microscopy showed that dislocation slip played a major role in the flow behavior with dislocation accumulation as the main source of work hardening. An identification of Burgers vectors revealed the extensive presence of prismatic dislocations. Rod-shaped Mg₁(Zn,Zr)₁ precipitates present in the as-received alloy become fragmented and overaged during ECAP.

Original language	English
Pages (from-to)	24-29
Number of pages	6
Journal	Materials Science and Engineering: A
Volume	517
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2009.03.032
State	Published - 20 Aug 2009
Externally published	Yes

Keywords

Dynamic testing
Equal-channel angular pressing
Magnesium alloy
Twinning
Ultrafine-grained structure

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10.1016/j.msea.2009.03.032

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title = "Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP",

abstract = "A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) at 473 K to produce a grain size of ∼0.8 μm and it was then tested under dynamic conditions at strain rates up to 4.0 × 103 s-1 using a split-Hopkinson bar. The stress-strain curves in dynamic testing exhibited upwards concave curvature suggesting the occurrence of twinning. Examination by transmission electron microscopy showed that dislocation slip played a major role in the flow behavior with dislocation accumulation as the main source of work hardening. An identification of Burgers vectors revealed the extensive presence of prismatic dislocations. Rod-shaped Mg1(Zn,Zr)1 precipitates present in the as-received alloy become fragmented and overaged during ECAP.",

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T1 - Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP

AU - Li, B.

AU - Joshi, S.

AU - Azevedo, K.

AU - Ma, E.

AU - Ramesh, K. T.

AU - Figueiredo, R. B.

AU - Langdon, T. G.

PY - 2009/8/20

Y1 - 2009/8/20

N2 - A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) at 473 K to produce a grain size of ∼0.8 μm and it was then tested under dynamic conditions at strain rates up to 4.0 × 103 s-1 using a split-Hopkinson bar. The stress-strain curves in dynamic testing exhibited upwards concave curvature suggesting the occurrence of twinning. Examination by transmission electron microscopy showed that dislocation slip played a major role in the flow behavior with dislocation accumulation as the main source of work hardening. An identification of Burgers vectors revealed the extensive presence of prismatic dislocations. Rod-shaped Mg1(Zn,Zr)1 precipitates present in the as-received alloy become fragmented and overaged during ECAP.

AB - A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) at 473 K to produce a grain size of ∼0.8 μm and it was then tested under dynamic conditions at strain rates up to 4.0 × 103 s-1 using a split-Hopkinson bar. The stress-strain curves in dynamic testing exhibited upwards concave curvature suggesting the occurrence of twinning. Examination by transmission electron microscopy showed that dislocation slip played a major role in the flow behavior with dislocation accumulation as the main source of work hardening. An identification of Burgers vectors revealed the extensive presence of prismatic dislocations. Rod-shaped Mg1(Zn,Zr)1 precipitates present in the as-received alloy become fragmented and overaged during ECAP.

KW - Dynamic testing

KW - Equal-channel angular pressing

KW - Magnesium alloy

KW - Twinning

KW - Ultrafine-grained structure

UR - https://www.scopus.com/pages/publications/67649410342

U2 - 10.1016/j.msea.2009.03.032

DO - 10.1016/j.msea.2009.03.032

M3 - 文章

AN - SCOPUS:67649410342

SN - 0921-5093

VL - 517

SP - 24

EP - 29

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

IS - 1-2

ER -

Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP

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Keywords

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