Phase equilibria in the Ti-rich corner of the Ti-Si-Sn-Al system Part I Section 9Si-1Sn (at.%)

摘要

Phase equilibria in Ti-rich corner of the Ti-Si-Sn-Al system were studied using differential thermal analysis, X-ray diffraction, microscopy, and electron microprobe analysis. Projections of solidus and liquidus surfaces, an isothermal section at 1300℃ and an isopleth at 9Si-1Sn (at.%) were constructed. It was shown that in the concentration interval studied at the solidus and 1300℃ temperatures two two-phase Ti_(5)(Si,Sn,Al)_(3)+<β-Ti> and Ti_(5)(Si,Sn,Al)_(3)+<α-Ti> regions are present. The liquidus surface is characterised by the regions of β and Z primary crystallisation, resulting in bivariant L reversible β + Ti_(5)(Si,Sn,Al)_(3) eutectic. The character of horizontal and vertical sections is similar to that for the Ti-Si-Al system.