TY - GEN
T1 - A Comparative Study on the Microstructure, Mechanical Properties, and Hot Deformation of Magnesium Alloys Containing Zinc, Calcium and Yttrium
AU - Rao, K.P.
AU - Suresh, K.
AU - Dieringa, H.
AU - Hort, N.
PY - 2017/2
Y1 - 2017/2
N2 - Some magnesium alloys are considered as biocompatible materials because they are biodegradable or bioabsorbable in body fluids without causing health hazards. Zinc (Zn) and calcium (Ca) are essential micronutrients in the body and their bio-absorption is beneficial when an orthopedic implant made of magnesium alloy corrodes in a controlled manner. Yttrium (Y) in small quantity can be added to improve the mechanical properties. Cast alloys are hot worked to obtain wrought microstructures so as to develop components of superior and consistent properties. In this study, the microstructure, mechanical properties, and hot deformation behavior of four cast magnesium alloys containing zinc, calcium and yttrium in different combinations are compared. It is found that calcium is an excellent grain refiner whereas yttrium enormously increases the grain size. While all these elements provide strengthening, calcium is found to be the most effective one in combination with zinc and yttrium or zinc alone. The hot working behaviors of these alloys over broad ranges of temperature and strain rate are compared using processing maps. Mg–1Zn–1Y alloy exhibits higher level of workability compared to the other alloys and over entire strain rate range of 0.0003–10 s−1 and 460–540 °C, although the initial grain size of the cast alloy is extremely large.
AB - Some magnesium alloys are considered as biocompatible materials because they are biodegradable or bioabsorbable in body fluids without causing health hazards. Zinc (Zn) and calcium (Ca) are essential micronutrients in the body and their bio-absorption is beneficial when an orthopedic implant made of magnesium alloy corrodes in a controlled manner. Yttrium (Y) in small quantity can be added to improve the mechanical properties. Cast alloys are hot worked to obtain wrought microstructures so as to develop components of superior and consistent properties. In this study, the microstructure, mechanical properties, and hot deformation behavior of four cast magnesium alloys containing zinc, calcium and yttrium in different combinations are compared. It is found that calcium is an excellent grain refiner whereas yttrium enormously increases the grain size. While all these elements provide strengthening, calcium is found to be the most effective one in combination with zinc and yttrium or zinc alone. The hot working behaviors of these alloys over broad ranges of temperature and strain rate are compared using processing maps. Mg–1Zn–1Y alloy exhibits higher level of workability compared to the other alloys and over entire strain rate range of 0.0003–10 s−1 and 460–540 °C, although the initial grain size of the cast alloy is extremely large.
KW - Mg alloys
KW - Microstructure
KW - Hot deformation
KW - Mechanical properties
UR - http://www.scopus.com/inward/record.url?scp=85042331551&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85042331551&origin=recordpage
U2 - 10.1007/978-3-319-52392-7_62
DO - 10.1007/978-3-319-52392-7_62
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 9783319523910
T3 - Minerals, Metals and Materials Series
SP - 449
EP - 461
BT - Magnesium Technology 2017
A2 - Solanki, Kiran N.
A2 - Orlov, Dmytro
A2 - Singh, Alok
A2 - Neelameggham, Neale R.
PB - Springer International Publishing
T2 - 146th TMS Annual Meeting and Exhibition
Y2 - 26 February 2017 through 2 March 2017
ER -