2124/SiC/25p T4
Temper
T4 = solution heat treated and naturally aged
Use where some extra ductility and toughness are wanted before final forming or where natural ageing is sufficient.
Values for the T4 condition
Other 2124/SiC/25p grades and fills
2124/SiC/25p is listed in 5 conditions; see the grade overview at 2124/SiC/25p.
Compare all 5 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Annealed | Chosen only for maximum workability during secondary forming or for stress-free machining blanks. | 180 | 300 | 8 | — |
As fabricated | Stock condition for billet, blanks and parts that will be heat treated after machining. | 330 | 450 | 5 | — |
T4This page Solution heat treated and naturally aged | Use where some extra ductility and toughness are wanted before final forming or where natural ageing is sufficient. | 400 | 560 | 5 | — |
T6Default Solution heat treated and artificially aged | Standard high-strength/high-stiffness condition for extruded or forged MMC structural parts. | 480 | 620 | 3 | — |
Solution heat treated, cold worked and artificially aged | Pick when maximum yield strength and dimensional stability are needed and low ductility is acceptable. | 570 | 660 | 2 | — |
What is 2124/SiC/25p T4?
2124/SiC/25p T4 is 2124/SiC/25p in the T4 temper — use where some extra ductility and toughness are wanted before final forming or where natural ageing is sufficient. 2124/SiC/25p T4 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 68% of composite grades. Elongation at break is 5% and the elastic modulus is 114 GPa (16.5 Msi). 2124/SiC/25p T4 has a density of 2.88 g/cm³ (0.104 lb/in³), heavier than 90% of composite grades. T6 is the default condition FabDigit quotes; T4 is available on request or by drawing note.
Advantages
- Conducts heat well — 130 W/m·K (75.1 BTU/hr·ft·°F), better than 90% of composite grades
- Ductile — tolerates forming and impact — 5%, better than 86% of composite grades
- Good UV / weathering resistance — 95/100, better than 78% of composite grades
- Tough — resists crack growth — 19 MPa·√m (17.3 ksi·√in), better than 76% of composite grades
Limitations
- Needs corrosion protection — 28/100, worse than 99% of composite grades
- Heavy — 2.88 g/cm³ (0.104 lb/in³), worse than 90% of composite grades
- Difficult to machine — 13/100, worse than 86% of composite grades
2124/SiC/25p T4 properties
Typical room-temperature values for 2124/SiC/25p T4; 14 are specific to this condition. Other listed values are 2124/SiC/25p reference data and may not represent this condition. Bars are the position among composite grades.
Physical1
2124/SiC/25p T4 has a density of 2.88 g/cm³ (0.104 lb/in³), heavier than 90% of composite grades.
Mechanical13
2124/SiC/25p T4 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 68% of composite grades. Elongation at break is 5% and the elastic modulus is 114 GPa (16.5 Msi).
Thermal6
2124/SiC/25p T4 is rated for continuous service to 150°C (302 °F). It conducts heat at 130 W/m·K (75.1 BTU/hr·ft·°F), better than 90% of composite grades. Thermal expansion is 15 µm/m·K (8.33 µin/in·°F).
Electrical1
2124/SiC/25p T4 has an electrical resistivity of 7.2×10⁻⁸ Ω·m.
Chemical & Environmental3
Corrosion resistance is poor (28/100), worse than 99% of composite grades. UV resistance is excellent.
Sustainability4
Producing a kilogram of 2124/SiC/25p T4 takes about 260 MJ of energy and emits 18 kg of CO₂ — more than 57% of composite grades. Typical recycled content is 0%.
Manufacturability2
2124/SiC/25p T4's machinability is not recommended (13/100, worse than 86% of composite grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 2124/SiC/25p T4
Is 2124/SiC/25p easy to machine?
Abrasive SiC demands PCD or CVD-diamond tooling, high speed/low feed and flood coolant; carbide edges wear in minutes and grinding/EDM are common finishing routes.
Can 2124/SiC/25p be welded?
Fusion welding is not recommended (SiC reacts with molten Al to form Al4C3); use friction stir welding, brazing, adhesive bonding or mechanical fasteners.
Can 2124/SiC/25p be formed, bent or molded?
Formed hot by extrusion, forging or hot rolling above ~400 °C at low strain rates; cold forming and tight-radius bending should be avoided due to low ductility.
What surface finishes work on 2124/SiC/25p?
Anodising works but gives a mottled grey finish with SiC pits; chromate/trivalent conversion coating, primer-paint or Ni plating are preferred for corrosion protection.
2124/SiC/25p chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| SiC (reinforcement)25 vol% particulate, typically 3–15 µm; wt% converted from volume fraction | 26 – 29.5 | 27.8 |
| Cuof the 2124 matrix (wt% of matrix) | 3.8 – 4.9 | 4.4 |
| Mgof the 2124 matrix | 1.2 – 1.8 | 1.5 |
| Mnof the 2124 matrix | 0.3 – 0.9 | 0.6 |
| Feimpurity limit, 2124 is a low-Fe/Si version of 2024 | ≤ 0.3 | 0.15 |
| Siimpurity limit | ≤ 0.2 | 0.1 |
| Zn | ≤ 0.25 | — |
| Cr | ≤ 0.1 | — |
| Ti | ≤ 0.15 | — |
| Almatrix balance | balance | — |
2124/SiC/25p T4 — frequently asked
What is 2124/SiC/25p T4 used for?
2124/SiC/25p T4 is typically used for missile fins, avionics chassis, aerospace structural fittings and precision instrument housings. In short: highest-strength particulate Al MMC; high specific stiffness; diamond tooling required.
What is the yield strength of 2124/SiC/25p T4?
2124/SiC/25p T4 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 68% of composite grades. Strength varies by condition: see the 5 listed tempers.
Is 2124/SiC/25p T4 easy to machine?
Not especially — machinability is rated not recommended (13/100, worse than 86% of composite grades). Abrasive SiC demands PCD or CVD-diamond tooling, high speed/low feed and flood coolant; carbide edges wear in minutes and grinding/EDM are common finishing routes.
Can 2124/SiC/25p T4 be welded?
Fusion welding is not recommended (SiC reacts with molten Al to form Al4C3); use friction stir welding, brazing, adhesive bonding or mechanical fasteners.
What surface finishes work on 2124/SiC/25p T4?
Anodising works but gives a mottled grey finish with SiC pits; chromate/trivalent conversion coating, primer-paint or Ni plating are preferred for corrosion protection.
Can 2124/SiC/25p T4 be formed, bent or molded?
Formed hot by extrusion, forging or hot rolling above ~400 °C at low strain rates; cold forming and tight-radius bending should be avoided due to low ductility.
What is the maximum service temperature of 2124/SiC/25p T4?
2124/SiC/25p T4 is rated for continuous use to about 150°C (302 °F), and briefly to 300°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 2124/SiC/25p T6 and 2124/SiC/25p O?
T6 is the default condition — standard high-strength/high-stiffness condition for extruded or forged MMC structural parts. O: chosen only for maximum workability during secondary forming or for stress-free machining blanks. Yield strength is 480 MPa in T6 versus 180 MPa in O.
Sources
- ASM Handbook Vol. 21: Composites — Discontinuously Reinforced Aluminium — ASM International (2001)
- ANSI H35.5 / Aluminum Association designation system for metal-matrix composites — The Aluminum Association (1997)
- DWA Aluminum Composites — 2124/SiC/25p extruded and forged product data — DWA Aluminum Composites (USA) (2015)
- Metal Matrix Composites: Mechanical properties of SiCp/2000 series Al — Elsevier / Comprehensive Composite Materials (2018)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.