Evolution of the microstructure and fracture characteristics of a Mg-Nd-Zn-Zr-Mn alloy through heat treatment and extrusion

Appropriate mechanical properties are essential for the use of biodegradable Mg-based alloys as structurally supporting materials. However, research studies on the evolution of the tensile fracture pathways and fracture characteristics of as-cast and as-extruded Mg-based alloys are limited. In this...

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Published inJournal of alloys and compounds Vol. 765; pp. 470 - 479
Main Authors Gui, Zhenzhen, Kang, Zhixin, Li, Yuanyuan
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.10.2018
Elsevier BV
Subjects
Alloy systems
Biodegradability
Ductile fracture
Elongation
Evolution
Extrusion
Fracture characteristics
Fracture pathway
Fractures
Grain boundaries
Heat treating
Heat treatment
Hot extrusion
Intergranular fracture
Magnesium base alloys
Manganese base alloys
Mechanical properties
Mechanical property
Mg-Nd-Zn-Zr-Mn
Microstructure
Multiscale microstructure
Precipitates
Precipitation hardening
Pressure casting
SEM/TEM
Solid solutions
Solution strengthening
Tensile properties
Zinc
Zirconium
Fracture characteristics
Multiscale microstructure
Fracture pathway
Mg-Nd-Zn-Zr-Mn
Mechanical property
SEM/TEM
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Abstract Appropriate mechanical properties are essential for the use of biodegradable Mg-based alloys as structurally supporting materials. However, research studies on the evolution of the tensile fracture pathways and fracture characteristics of as-cast and as-extruded Mg-based alloys are limited. In this paper, the microstructures, tensile properties, fracture pathways and fracture characteristics of the as-cast, heat treated and hot-extruded Mg-1.59Nd-2.91Zn-0.05Zr-0.35Mn (NZKM) alloys were systematically investigated. The results indicated that the hot-extruded NZKM alloy exhibits good mechanical properties with a yield strength and an elongation reaching 212 MPa and 30.7%, respectively. These excellent properties were attributed to its special multiscale microstructure consisting of an α-Mg matrix (2–10 μm), eutectic compound β-Mg4Zn7 (2–10 μm) together with a high density of dispersed nanoscale precipitates, that provide solid solution strengthening, grain boundary strengthening and precipitation strengthening effects. The fracture patterns changed with the evolution of the microstructures. Intergranular and transgranular cleavage fractures were changed to ductile fractures by hot extrusion. [Display omitted] •Hot extrusion enhanced mechanical properties of Mg-Nd-Zn-Zr-Mn (NZKM) alloy.•Great mechanical properties because of dislocations and deformation twins.•Morphologies of eutectic compounds and grain sizes affect fracture behaviors.
AbstractList Appropriate mechanical properties are essential for the use of biodegradable Mg-based alloys as structurally supporting materials. However, research studies on the evolution of the tensile fracture pathways and fracture characteristics of as-cast and as-extruded Mg-based alloys are limited. In this paper, the microstructures, tensile properties, fracture pathways and fracture characteristics of the as-cast, heat treated and hot-extruded Mg-1.59Nd-2.91Zn-0.05Zr-0.35Mn (NZKM) alloys were systematically investigated. The results indicated that the hot-extruded NZKM alloy exhibits good mechanical properties with a yield strength and an elongation reaching 212 MPa and 30.7%, respectively. These excellent properties were attributed to its special multiscale microstructure consisting of an α-Mg matrix (2–10 μm), eutectic compound β-Mg4Zn7 (2–10 μm) together with a high density of dispersed nanoscale precipitates, that provide solid solution strengthening, grain boundary strengthening and precipitation strengthening effects. The fracture patterns changed with the evolution of the microstructures. Intergranular and transgranular cleavage fractures were changed to ductile fractures by hot extrusion.
Appropriate mechanical properties are essential for the use of biodegradable Mg-based alloys as structurally supporting materials. However, research studies on the evolution of the tensile fracture pathways and fracture characteristics of as-cast and as-extruded Mg-based alloys are limited. In this paper, the microstructures, tensile properties, fracture pathways and fracture characteristics of the as-cast, heat treated and hot-extruded Mg-1.59Nd-2.91Zn-0.05Zr-0.35Mn (NZKM) alloys were systematically investigated. The results indicated that the hot-extruded NZKM alloy exhibits good mechanical properties with a yield strength and an elongation reaching 212 MPa and 30.7%, respectively. These excellent properties were attributed to its special multiscale microstructure consisting of an α-Mg matrix (2–10 μm), eutectic compound β-Mg4Zn7 (2–10 μm) together with a high density of dispersed nanoscale precipitates, that provide solid solution strengthening, grain boundary strengthening and precipitation strengthening effects. The fracture patterns changed with the evolution of the microstructures. Intergranular and transgranular cleavage fractures were changed to ductile fractures by hot extrusion. [Display omitted] •Hot extrusion enhanced mechanical properties of Mg-Nd-Zn-Zr-Mn (NZKM) alloy.•Great mechanical properties because of dislocations and deformation twins.•Morphologies of eutectic compounds and grain sizes affect fracture behaviors.
Author Kang, Zhixin
Li, Yuanyuan
Gui, Zhenzhen
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Keywords Fracture characteristics
Multiscale microstructure
Fracture pathway
Mg-Nd-Zn-Zr-Mn
Mechanical property
SEM/TEM
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Snippet Appropriate mechanical properties are essential for the use of biodegradable Mg-based alloys as structurally supporting materials. However, research studies on...
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SubjectTerms Alloy systems
Biodegradability
Ductile fracture
Elongation
Evolution
Extrusion
Fracture characteristics
Fracture pathway
Fractures
Grain boundaries
Heat treating
Heat treatment
Hot extrusion
Intergranular fracture
Magnesium base alloys
Manganese base alloys
Mechanical properties
Mechanical property
Mg-Nd-Zn-Zr-Mn
Microstructure
Multiscale microstructure
Precipitates
Precipitation hardening
Pressure casting
SEM/TEM
Solid solutions
Solution strengthening
Tensile properties
Zinc
Zirconium
Title Evolution of the microstructure and fracture characteristics of a Mg-Nd-Zn-Zr-Mn alloy through heat treatment and extrusion
URI https://dx.doi.org/10.1016/j.jallcom.2018.06.185
https://www.proquest.com/docview/2117574547
Volume 765
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