Al-Fe-Mn-Si

Adding a small amount of Mn may promote the formation of the α-AlMnSi phase (named as AL15SI2M4, M=Cr, Fe, Mn, Mo). In fact, it competes with Al-Fe-Si compounds and forms during the casting of a wide variety of aluminum alloys. This example uses the TCS Al-based Alloy Database (TCAL).

Al-Fe-Mn-Si liquidus surface at 0.3 wt. % Mn.

Figure 1: Al-Fe-Mn-Si liquidus surface at 0.3 wt. % Mn. (α-AlFeSi: τ5; β-AlFeSi: τ6; γ-AlFeSi: τ2; δ-AlFeSi: τ4; α-AlMnSi: τ9) [2014Che].

Reference

[2014Che] H. Chen, Q. Chen, Y. Du, J. Bratberg, A. Engström, Update of Al-Fe-Si, Al-Mn-Si and Al-Fe-Mn-Si thermodynamic descriptions - TNMSC. Chinese J. Nonferrous Met. 24, 2041–2053 (2014).