TY - JOUR

T1 - Processing and microstructure-property relations of high-strength low-alloy (HSLA) Mg-Zn-Ca alloys

AU - Hofstetter, Joelle

AU - Rüedi, S.

AU - Baumgartner, Iris

AU - Kilian, Helmut

AU - Mingler, B.

AU - Povoden-Karadeniz, Erwin

AU - Pogatscher, Stefan

AU - Uggowitzer, Peter

AU - Löffler, Jörg F.

PY - 2015/8/13

Y1 - 2015/8/13

N2 - Deformation dilatometry and semi-industrial extrusion were used to investigate the effect of different thermomechanical processing routes on the microstructure and mechanical properties of the low-alloy Mg alloys ZX10 (Mg-1Zn-0.3Ca) and ZX00 (Mg-0.5Zn-0.15Ca). It is shown that the deliberately adjusted formation of intermetallic particles beneficially influences dynamic recrystallization and grain growth, with the result of a fine-grained microstructure (grain size < 2 μm). The presence of unrecrystallized regions with its unfavorable influence on ductility and mechanical anisotropy can be controlled by the selection of an indirect extrusion mode. Meta-dynamic recrystallization generates almost fully recrystallized microstructures and hence the desired properties, which are characterized by high strength (yield strength ≈ 240 MPa), simultaneously high ductility (elongation to fracture ≈ 30%), and low structural and mechanical anisotropy. These properties are of great interest for light-weight applications and for deployment as biodegradable implants in medical technology.

AB - Deformation dilatometry and semi-industrial extrusion were used to investigate the effect of different thermomechanical processing routes on the microstructure and mechanical properties of the low-alloy Mg alloys ZX10 (Mg-1Zn-0.3Ca) and ZX00 (Mg-0.5Zn-0.15Ca). It is shown that the deliberately adjusted formation of intermetallic particles beneficially influences dynamic recrystallization and grain growth, with the result of a fine-grained microstructure (grain size < 2 μm). The presence of unrecrystallized regions with its unfavorable influence on ductility and mechanical anisotropy can be controlled by the selection of an indirect extrusion mode. Meta-dynamic recrystallization generates almost fully recrystallized microstructures and hence the desired properties, which are characterized by high strength (yield strength ≈ 240 MPa), simultaneously high ductility (elongation to fracture ≈ 30%), and low structural and mechanical anisotropy. These properties are of great interest for light-weight applications and for deployment as biodegradable implants in medical technology.

KW - Dilatometry

KW - Grain refinement

KW - Magnesium alloys

KW - Mechanical properties

KW - Recrystallization

KW - Thermomechanical processing

UR - http://www.scopus.com/inward/record.url?scp=84939485463&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2015.07.021

DO - 10.1016/j.actamat.2015.07.021

M3 - Article

AN - SCOPUS:84939485463

VL - 98.2015

SP - 423

EP - 432

JO - Acta materialia

JF - Acta materialia

SN - 1359-6454

IS - 1 October

ER -