Abstract
Precipitation hardening provides one of the most common strengthening mechanisms for magnesium (Mg) alloys. Here, we report a new precipitation-hardenable Mg sheet alloy based on the magnesium–silver–calcium system. In a solution treated condition (T4), the strength of Mg–xAg–0.1Ca alloys is enhanced with increasing the Ag content from 1.5 wt.% to 12 wt.%. The Mg–12Ag–0.1Ca (wt.%) alloy sheet shows moderate tensile yield strengths of 193 MPa, 130 MPa, 117 MPa along the rolling direction (RD), 45° and transverse direction (TD) in the T4-treated condition. Subsequent artificial aging at 170 °C for 336 h (T6) increases the tensile yield strengths to 236 MPa, 163 MPa and 143 MPa along the RD, 45° and TD, respectively. This improvement in the tensile yield strength by the T6 treatment can be ascribed to the formation of AgMg4 precipitates lying on the {112¯0}ɑ and pyramidal planes. Our finding is expected to stimulate the development of precipitation-hardenable Mg–Ag-based wrought alloys with high strength.
Highlights
The lightest structural metThe lightest structural metal magnesium (Mg) and its alloys have attracted significant interest in decades due to t in the past two the past two decades due to their potential applications in the automotive sector [1,2,3]
Currentcurrent applications of wrought applications of wrought Mg alloys as a structural component are very limited, which can be ascribed ascribed to their inferior mech to their inferior mechanical properties at room temperature (RT) and poor corrosionresistance resistance [4]
An extraordinary high tensile yield strength of 473 MPa wasMPa obtained in a was obtained in a heavy r heavy rare-earth (RE) containing Mg–10Gd–5.7Y–1.6Zn–0.7Zr alloy processed by aprocessed conventional by a conventional ext extrusion process followed by 200 ◦ C aging for 64 h [7]
Summary
Mg–1.3Al–0.8Zn–0.7Mn–0.5Ca alloy sheet, which alloys open precipitation-hardenable allo high resolution (HR) HAADF‐STEM. AgMg phase showing precipitation-hardenable alloys with hM atom probe tomography, revealed that mono-atomic layer. It is believed that solute atoms are demonstrated to be enriched in grain boundaries the T4‐treated condition,inasMg–Al–Ca–Mn(–Zn) shown in for theof strength improvement alloy segregation to grain boundaries occurs in the. It is believed that solute segregation to grain boundaries occurs the 1.5Ag containing alloyobtainable after 1 demonstrated thatinbake-hardenability is even solute segregation be much that in the Considering less Ag atoms will be dissolved into ɑ‐Mg matrix and
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