Phase diagram of the Al–Er–Mo ternary system at 873 K

Abstract

The phase relationship in the AlÀErÀMo ternary system at 873 K has been investigated based on the equilibrated method mainly by means of X-ray powder diffraction and scanning electron microscopy. The existence of 10 binary compounds and two ternary compounds has been confirmed. The results present that the isothermal section at 873 K is governed by 15 single-phase regions, 29 two-phase regions and 15 three-phase regions. By using the phase-disappearing method, Al 8 Mo 3 has a narrow homogeneity range (from 72 to 73 at% Al), while the homogeneity range of AlMo 3 is from 21% to 28.5% at% Al. Also, the maximum solubility of Al in Mo is about 16 at%.

Effects of Trace Erbium Addition on Microstructure and Mechanical Properties of Ti6Al4V-xEr Alloys

“…Because the electronegativity difference of oxygen with erbium is the largest, it is thus easiest to form an oxide between them [23], that is, Er2O3 in this alloy. While in Figure 9c, the SAED revealed that the crystal structure of fine irregular dispersions was simple cubic with lattice parameters of a = b = c = 7.793Å, together with the Al-Er binary phase diagram [24], concluding that it is Al2Er phase. During casting and solidification, once oxygen as an impurity was consumed, erbium then tends to react with other element(s) to form intermetallic compound.…”