Table 2.
Experimental phase compositions and cell parameters of selected samples (situated in three-phase fields) in the partial isothermal sections at 800 °C and 900 °C.
| Sample # | Nominal sample composition (at.%) | Annealing (°C) | Phases (XRD) | Cell parameter (Å) | Phase composition determined by EPMA |
||||
|---|---|---|---|---|---|---|---|---|---|
| Al (at.%) | Fe (at.%) | Si (at%) | |||||||
| 1 | Al62Fe27Si11 | 800 | Al13Fe4 | a = 15.4980(2) | b = 7.9627(2) | c = 12.5567(1) | 70.7(1) | 24.9(2) | 4.4(2) |
| β = 107.96 | |||||||||
| τ1 | a = 4.6335(1) | b = 6.3467(2) | c = 7.5355(2) | 36.4(2) | 37.5(1) | 26.1(2) | |||
| α = 102.14 | β = 106.04 | γ = 101.30 | |||||||
| τ11 | a = 7.5355(1) | c = 7.5805(2) | 64.7(2) | 26.1(2) | 9.2(1) | ||||
| 2 | Al55Fe27Si18 | 800 | τ1 | a = 4.6483(1) | b = 6.3225(3) | c = 7.5063(3) | 28.6(3) | 38.0(2) | 33.4(4) |
| α = 101.35 | β = 105.92 | γ = 101.21 | |||||||
| τ3 | a = 7.9755(1) | b = 15.2067(1) | c = 15.2378(1) | 54.5(1) | 26.6(1) | 18.9(2) | |||
| τ11 | a = 7.5253(1) | c = 7.5605(2) | 62.3(2) | 25.9(1) | 11.8(3) | ||||
| 3 | Al46Fe27Si27 | 800 | τ1 | a = 4.6840(2) | b = 6.3370(2) | c = 7.4952(3) | 27.1(2) | 37.8(1) | 35.1(3) |
| α = 101.40 | β = 105.75 | γ = 101.60 | |||||||
| τ3 | a = 7.9557(1) | b = 15.1789(5) | c = 15.2259(6) | 51.8(2) | 25.2(1) | 23.0 | |||
| τ7 | a = 7.3257(1) | b = 8.2792(1) | c = 14.6096(3) | 46.6(3) | 26.1(2) | 27.3(2) | |||
| β = 93.71 | |||||||||
| 4 | Al27Fe27Si46 | 800 | Si | a = 5.4229(2) | 0.3(3) | 0.5(1) | 99.2(3) | ||
| τ7 | a = 7.1829(3) | b = 8.3569(3) | c = 14.4564(6) | 41.3(2) | 23.8(1) | 34.9(1) | |||
| β = 93.81 | |||||||||
| τ8 | a = 3.6665(5) | b = 12.3419(1) | c = 10.1365(1) | 25.5(1) | 33.5(1) | 41.0(3) | |||
| 5 | Al14Fe27Si59 | 800 | HT-FeSi2 | a = 2.7067(1) | c = 5.1797(2) | 4.5(5) | 31.0(2) | 64.5(5) | |
| τ1 | a = 5.4293(1) | 0.0(1) | 0.6(1) | 99.4(1) | |||||
| τ8 | a = 3.6679(5) | b = 12.3430(2) | c = 10.1413(2) | 24.0(1) | 33.7(1) | 42.3(1) | |||
| 6 | Al51Fe35Si14 | 800 | AlFe | a = 2.8508(6) | 37.0(1) | 47.5(1) | 15.5(1) | ||
| Al5Fe2 | a = 7.6381(5) | b = 6.3876(4) | c = 4.2302(3) | 68.8(1) | 29.0(5) | 2.2(4) | |||
| τ12 | a = 10.8011(2) | 48.3(2) | 36.3(2) | 15.4(1) | |||||
| 7 | Al48Fe35Si17 | 800 | Al5Fe2 | a = 7.6461(2) | b = 6.3879(2) | c = 4.2427(1) | 70.1(2) | 27.4(2) | 2.5(2) |
| τ1 | a = 4.7385(2) | b = 6.3217(3) | c = 7.4828(3) | 40.0(1) | 37.7(2) | 22.3(3) | |||
| α = 100.17 | β = 104.97 | γ = 102.39 | |||||||
| τ12 | a = 10.8141(2) | 49.5(3) | 34.9(2) | 15.6(2) | |||||
| 8 | Al29Fe35Si36 | 800 | τ1 | a = 4.6134(3) | b = 6.3304(4) | c = 7.5082(4) | 25.4(2) | 38.0(2) | 36.6(1) |
| α = 101.76 | β = 106.29 | γ = 100.75 | |||||||
| τ7 | a = 7.2656(3) | b = 8.3165(3) | c = 14.5216(7) | 44.9(2) | 25.8(1) | 29.3(2) | |||
| β = 93.83 | |||||||||
| τ8 | a = 3.6599(4) | b = 12.4729(5) | c = 10.1568(2) | 28.6(1) | 34.1(1) | 37.3(1) | |||
| 9 | Al19Fe35Si46 | 800 | HT-FeSi2 | a = 2.7171(1) | c = 5.2131(1) | 7.8(2) | 33.5(2) | 58.4(2) | |
| τ1 | a = 4.5889(1) | b = 6.3373(2) | c = 7.5251(2) | 21.1(1) | 38.3(2) | 40.6(2) | |||
| α = 101.93 | β = 106.45 | γ = 100.70 | |||||||
| τ8 | a = 3.6689(1) | b = 12.3245(2) | c = 10.1407(1) | 23.2(1) | 34.5(2) | 42.3(2) | |||
| 10 | Al1Fe35Si64 | 800 | FeSi | a = 4.4909(1) | 0.9(1) | 50.6(1) | 48.5(1) | ||
| HT-FeSi2 | a = 2.6792(5) | c = 5.1676(6) | 2.7(3) | 32.4(1) | 64.9(3) | ||||
| LT-FeSi2 | a = 9.8886(1) | b = 7.8073(1) | c = 7.8487(1) | 0.7(1) | 34.3(1) | 65.0(1) | |||
| 11 | Al55Fe40Si5 | 900 | AlFe | a = 2.8790(1) | 44.3(1) | 47.5(1) | 8.2(1) | ||
| Al5Fe2 | a = 7.6464(4) | b = 6.4002(3) | c = 4.2223(2) | 68.7(1) | 30.2(1) | 1.1(1) | |||
| Al2Fe | a = 4.8811(6) | b = 6.4472(7) | c = 8.7706(1) | 64.5(1) | 34.0(1) | 1.5(1) | |||
| α = 91.65 | β = 73.21 | γ = 96.61 | |||||||
| 12 | Al48Fe37Si15 | 900 | AlFe | a = 2.8544(2) | 36.5(1) | 46.7(1) | 16.8(0) | ||
| Al5Fe2 | a = 7.6446(1) | b = 6.3938(1) | c = 4.2340(1) | 69.6(1) | 28.6(1) | 1.8(2) | |||
| τ12 | a = 10.8039(1) | 47.6(1) | 36.4(2) | 16.0(1) | |||||
| 13 | Al40Fe40Si20 | 900 | AlFe | a = 2.8471(1) | 35.0(2) | 46.8(2) | 18.2(1) | ||
| τ1 | a = 4.7553(1) | b = 6.3208(2) | c = 7.4757(2) | 41.7(1) | 37.5(1) | 20.8(1) | |||
| α = 99.92 | β = 104.72 | γ = 102.55 | |||||||
| τ12 | a = 10.8008(5) | 47.7(1) | 36.4(0) | 15.9(2) | |||||
| 14 | Al35Fe40Si25 | 900 | AlFe | a = 2.8400(1) | 32.0(0) | 47.3(1) | 20.7(1) | ||
| FeSi | a = 4.5329(2) | 11.5(1) | 49.9(0) | 38.6(1) | |||||
| τ1 | a = 4.7238(1) | b = 6.3224(2) | c = 7.4866(2) | 37.7(3) | 37.8(1) | 24.5(2) | |||
| α = 100.45 | β = 105.10 | γ = 102.21 | |||||||
| 15 | Al15Fe40Si45 | 900 | FeSi | a = 4.4925(1) | 1.8(0) | 49.4(0) | 48.8(1) | ||
| HT-FeSi2 | a = 2.7174(1) | c = 5.2150(4) | 8.5(0) | 32.9(0) | 58.6(0) | ||||
| τ1 | a = 4.5855(1) | b = 6.3357(1) | c = 7.5259(2) | 21.2(0) | 37.6(0) | 41.2(1) | |||
| α = 101.96 | β = 106.45 | γ = 100.70 | |||||||
| 16 | Al1.5Fe33Si65.5 | 900 | FeSi | a = 4.4892(3) | 0.7(0) | 49.6(2) | 49.7(2) | ||
| LT-FeSi2 | a = 9.8867(3) | b = 7.8056(2) | c = 7.8482(2) | 0.6(0) | 33.7(0) | 65.8(0) | |||
| HT-FeSi2 | a = 2.7037(1) | c = 5.1639(4) | 2.4(0) | 31.8(0) | 65.8(0) | ||||
| 17 | Al5Fe10Si85 | 900 | HT-FeSi2 | a = 2.7107(1) | c = 5.4303(1) | 8.4(1) | 31.3(0) | 60.3(0) | |
| Si | a = 5.1990(3) | 0.3(4) | 0.2(0) | 99.5(4) | |||||
| L | – | 49.6(2) | 16.7(1) | 33.7(1) | |||||
| 18 | Al1.4Fe63Si35.6 | 900 | AlFe | a = 2.8193(1) | 1.4(0) | 71.2(3) | 27.5(3) | ||
| FeSi | a = 4.4936(2) | 1.5(0) | 50.9(1) | 47.5(1) | |||||
| Fe5Si3 | a = 6.7142(2) | b = 4.7260(1) | 0.1(0) | 62.7(3) | 37.2(3) | ||||