About the Al–Cu–Si isothermal section at 500°C and the stability of the ɛ-Cu15Si4 phase

Low temperature formation of copper rich silicides

“…In contrast to the majority of published papers on the phase relations [4e6,21e25], our experiment on copper-silicides was produced by heating copper and amorphous silicon, in high vacuum. It seems to be evident that no Cu 79 Si 21 (ε) phase [26] formed up to 500 C. Combined with the knowledge of the previously mentioned works like Riani et al's [6], this prompts the question whether a new comprehensive study of the Cu À Si phase diagram is needed. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64…”

“…There are many differences between the widely cited phase diagram of Olesinski and Abbaschian and the recent results [5], showing us an uncertainty of the Cu À Si phase diagram. A good example for this uncertainty is the work of P. Riani et al [6] who studied the stability of the Cu 79 Si 21 -ε phase.…”

Experimental investigation of the Cu–Si phase diagram at x(Cu)>0.72

“…Finally in a recent work by part of the present authors [32] , dedicated to the investigation of the 500 °C Al–Cu–Si phase equilibria, a few Cu–Si binary samples at the ɛ-Cu 15 Si 4 composition were also investigated. Samples were synthesized by arc melting under Ar atmosphere with zirconium pieces as oxygen getter from silicon granules (99.99 mass%) and copper sheet (99.999 mass%).…”

New investigation of phase equilibria in the system Al–Cu–Si

“…The phase with the composition Cu 3 Si shows a solubility of 2.4 at.% Al in the current work compared to 4.8 at.% in [35]. The solubility ranges of (Cu,Si)-ɛ are in the same range in both cases (2 at.% Al compared to 1.5 at.% Al in [35]).…”