Compositional Optimization of Al-Mn-X Alloys and, Their Tensile and Corrosion Properties

Abstract

The ultimate tensile strength of 250 MPa, 0.2% proof stress of 150 MPa, and fracture strain of 10% at the as-cast condition for Al-1.5Mn-X alloys, were objective in this development. As ternary elements, Ca, Mg, Ti and Zn were initially chosen and the values in ¦Mk of the s-orbital energy level in alloys were adjusted to be less than 0.017. Their proof stress and fracture strain increased and decreased as ¦Mk increased, respectively. The composition of promising alloy was decided to Al-1.5Mn-2.4Mg with ¦Mk of 0.029 on the basis of the relation between tensile properties and ¦Mk. This as-cast alloy showed the · uts · 0.2 and ¾ f of 270, 135 MPa and 18% showing excellent corrosion resistance in the NaCl solution, which resulted in the approximate satisfaction of the objective. The interaction between the proof stress and dislocation density or hindrance for dislocation migration at the constant strain could be explained by ¦Mk, which might lead to the indication of solid solution hardening level using this parameter for Al-1.5Mn-X ternary alloys.

Tensile Properties of Bi Alloys and a Case Study for Alloy Design in Their Application to High Temperature Solders

“…Strength properties including both strain hardening and precipitation hardening were treated well in terms of this parameter alone 22,28) . Further, it has been concluded that the interaction between the proof stress and dislocation density or hindrance for dislocation migration at the constant strain could be explained by ΔMk, which might lead to the indication of solid solution hardening level using this parameter for Al-1.5Mn-X ternary alloys 21) . Therefore, it may be presumed even under this condition of few or no solubility of each element into Bi, that the mechanical properties were roughly predicted by the values of ΔMk considering on the basis of fracture behaviors, because this parameter correlated to dislocation behaviors such as hindrance for dislocation migration in or near metallic parts by the increase or addition of alloying elements.…”

“…These three types of alloys were clearly separated in the Bo and Md map 17) . Moreover, the compositional optimization of Al 21) system alloys as a simple metal were carried out by using s-orbital energy level (Mk) [13][14][15] . The interaction between the dislocation density (or hindrance for dislocation migration) and ΔMk were investigated in the previous report 21) .…”

“…Moreover, the compositional optimization of Al 21) system alloys as a simple metal were carried out by using s-orbital energy level (Mk) [13][14][15] . The interaction between the dislocation density (or hindrance for dislocation migration) and ΔMk were investigated in the previous report 21) . It was concluded that the ΔMk could be used as the indication of solid solution harden-ing level for ternary Al-1.5Mn-xMg alloys.…”

Effect of Si Addition on Microstructure and Mechanical Properties of Al–1.5%Mn Alloys

“…It can be considered that some of a little number of elements can be added to the alloys for achieving solid solution strengthening. 1316) In the previous study, 15) Al1.5Mn was used as the base alloy, the Zn, Ca, Mg and Ti were chosen as alloying elements, and the relationship between mechanical properties and "Mk value (the compositional average value of s-orbital energy level in the alloy) was experimentally investigated in details. The composition of promising alloy was decided to Al1.5Mn2.4Mg with the "Mk value of 0.029 on the basis of the relationship between tensile properties and "Mk value as the indication of the solid solution strengthening level of the alloy.…”

High Temperature Characterization of Binary and Ternary Bi Alloys Microalloyed with Cu and Ag

“…Moreover, the compositional optimization of Al 20) system alloys as a simple metal was performed based on the s-orbital energy level (Mk) [15][16][17] . The relationship between the dislocation density (or hindrance to dislocation migration) and Mk has also been investigated previously 21) . It was concluded that the Mk value could be used as an indicator of the level of solid-solution hardening in ternary Al-1.5Mn-xMg alloys consisting of a mono phase.…”