Abstract
The effect of Sr additions on the microstructure and strength of a Mg-5Al-3Ca alloy was investigated by replacing Ca with Sr. In the as-cast alloys, the major intermetallic compound observed at the α-Mg dendrite cell boundary region changes from the Al-rich (Mg, Al)2Ca phase to the Mg-rich Mg17Sr2 phase with increasing Sr content. This results in an increased Al solute content in the α -Mg phase in the high-Sr containing alloys. More than 1 wt pct of Sr enhances the solid-solution strength of the α -Mg phase, resulting in the increased compression strength of the alloys.
| Original language | English |
|---|---|
| Pages (from-to) | 420-427 |
| Number of pages | 8 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 38 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2007 |
Funding
This research was supported by NSF FRG Grant No. DMR-0309468 and the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Freedom Car and Vehicle Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT–Battelle, LLC, for the United States Department of Energy under Contact No. DE-AC05-000R22725. The authors are thankful to C.J. Torbet, C. Henderson (University of Michigan), Dr. B.R. Powell, N. Irish (General Motors), and Dr. P. Bakke (Norsk Hydro) for their assistance.