Aluminum Sintered 2014 ACT4-I
Precip hard
also MPIF 2014
ACT4-I = aCT4-2014 Type I
T4 on low-density parts: better strength than as-sintered while keeping some ductility for coining/staking.
Values for the ACT4-I condition
Other Sintered 2014 tempers and conditions
Sintered 2014 is listed in 9 conditions; see the grade overview at Sintered 2014.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ACT1-2014 Type I | Cheapest condition: as-sintered, lowest density — for lightly loaded brackets, covers and non-structural housings. | 75 | 125 | 5 | 45 HB | 33 % IACS |
ACT1-2014 Type II | As-sintered at intermediate compaction pressure — best cost/strength balance when no heat treatment is wanted. | 90 | 150 | 6 | 50 HB | 35 % IACS |
ACT1-2014 Type III | High-density as-sintered (double-press/repress or high compaction) for the best as-sintered ductility and toughness. | 100 | 170 | 7 | 55 HB | 37 % IACS |
ACT4-IThis page ACT4-2014 Type I | T4 on low-density parts: better strength than as-sintered while keeping some ductility for coining/staking. | 125 | 180 | 3 | 65 HB | 28 % IACS |
ACT4-2014 Type II | Standard T4 condition — good compromise of strength and residual ductility for parts that are sized after heat treatment. | 150 | 215 | 3.5 | 70 HB | 30 % IACS |
ACT4-2014 Type III | Highest-ductility heat-treated condition; use where impact or subsequent coining is required. | 170 | 245 | 4 | 75 HB | 32 % IACS |
ACT6-2014 Type I | T6 on economy-density parts: maximum hardness per unit cost, but very little ductility. | 200 | 220 | 1 | 80 HB | 32 % IACS |
ACT6-IIDefault ACT6-2014 Type II | The workhorse condition for sintered 2014 structural parts: full T6 strength at standard compaction density. | 250 | 270 | 1.5 | 90 HB | 34 % IACS |
ACT6-2014 Type III | Peak-strength sintered 2014: high-density (repressed/sinter-forged) parts approaching wrought 2014-T6 strength levels. | 310 | 330 | 2 | 100 HB | 36 % IACS |
What is Sintered 2014 ACT4-I?
Sintered 2014 ACT4-I is Sintered 2014 in the ACT4-I condition — t4 on low-density parts: better strength than as-sintered while keeping some ductility for coining/staking. Sintered 2014 ACT4-I has a yield strength of 125 MPa (18.1 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 75% of aluminum grades. Elongation at break is 3% and the elastic modulus is 55 GPa (7.98 Msi). Sintered 2014 ACT4-I has a density of 2.45 g/cm³ (0.0885 lb/in³), lighter than 100% of aluminum grades. It melts at 507°C (945 °F). ACT6-II is the default condition FabDigit quotes; ACT4-I is available on request or by drawing note.
Advantages
- Easy to machine — 78/100, better than 89% of aluminum grades
Limitations
- Low stiffness — 55 GPa (7.98 Msi), worse than 100% of aluminum grades
- Hard to polish — 30/100, worse than 100% of aluminum grades
- Difficult to weld — 20/100, worse than 89% of aluminum grades
- Poor heat conductor — 115 W/m·K (66.4 BTU/hr·ft·°F), worse than 85% of aluminum grades
- Low electrical conductivity — 28 % IACS, worse than 82% of aluminum grades
Sintered 2014 ACT4-I properties
Typical room-temperature values for Sintered 2014 ACT4-I; 27 are specific to this condition. Other listed values are Sintered 2014 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
Sintered 2014 ACT4-I has a density of 2.45 g/cm³ (0.0885 lb/in³), lighter than 100% of aluminum grades. It melts at 507°C (945 °F).
Mechanical13
Sintered 2014 ACT4-I has a yield strength of 125 MPa (18.1 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 75% of aluminum grades. Elongation at break is 3% and the elastic modulus is 55 GPa (7.98 Msi).
Thermal6
Sintered 2014 ACT4-I is rated for continuous service to 120°C (248 °F). It conducts heat at 115 W/m·K (66.4 BTU/hr·ft·°F), worse than 85% of aluminum grades. Thermal expansion is 22.5 µm/m·K (12.5 µin/in·°F).
Electrical3
Sintered 2014 ACT4-I conducts electricity at 28 % IACS, worse than 82% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (40/100), worse than 75% of aluminum grades.
Sustainability4
Producing a kilogram of Sintered 2014 ACT4-I takes about 205 MJ of energy and emits 13.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 10%.
Manufacturability8
Sintered 2014 ACT4-I's machinability is very good (78/100, better than 89% of aluminum grades); weldability poor (20/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Sintered 2014 ACT4-I
Is Sintered 2014 easy to machine?
Machines easily with sharp carbide/PCD tooling and light feeds, but interrupted cutting across pores dulls edges and smears; avoid coolants that soak into porosity unless the part is later impregnated.
Can Sintered 2014 be welded?
Essentially not weldable by fusion — trapped gas in pores blows the weld pool and the Al-Cu chemistry hot-cracks; join by adhesive, mechanical fastening or brazing on impregnated parts.
Can Sintered 2014 be formed, bent or molded?
Formed by uniaxial die compaction of lubricated premix, delubrication and sintering near 590–620 °C in dry N2; density is raised by repressing/sinter-forging, and coining or sizing is used to hit tolerances.
What surface finishes work on Sintered 2014?
Deburr by vibratory tumbling; resin- or oil-impregnate before plating, anodizing or painting to stop chemical bleed-out; chromate/phosphate conversion coatings and impregnation-plus-hard-anodize are typical for wear surfaces.
Sintered 2014 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 |
|---|---|---|
| Cumain strengthening addition, admixed or prealloyed | 3.8 – 5 | 4.4 |
| Si | 0.5 – 1.2 | 0.8 |
| Mg | 0.2 – 0.8 | 0.5 |
| Feimpurity limit | ≤ 0.3 | — |
| Mnimpurity/optional | ≤ 0.4 | — |
| Other, each | ≤ 0.05 | — |
| lubricant (admixed wax/stearate)green-state only; burned off during delubrication/sintering | 1 – 1.75 | 1.5 |
| Al | balance | — |
Sintered 2014 ACT4-I — frequently asked
What is Sintered 2014 ACT4-I used for?
Sintered 2014 ACT4-I is typically used for automotive P/M brackets, small structural components, gears and bushings and cost-sensitive precision parts. In short: strongest common P/M aluminum; near-net shape, low machining; porosity limits ductility.
What is the yield strength of Sintered 2014 ACT4-I?
Sintered 2014 ACT4-I has a typical yield strength of 125 MPa (18.1 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 75% of aluminum grades. Strength varies by condition: see the 9 listed tempers.
Is Sintered 2014 ACT4-I easy to machine?
Yes — machinability is rated very good (78/100, better than 89% of aluminum grades). Machines easily with sharp carbide/PCD tooling and light feeds, but interrupted cutting across pores dulls edges and smears; avoid coolants that soak into porosity unless the part is later impregnated.
Can Sintered 2014 ACT4-I be welded?
Not readily — weldability is rated poor (20/100). Essentially not weldable by fusion — trapped gas in pores blows the weld pool and the Al-Cu chemistry hot-cracks; join by adhesive, mechanical fastening or brazing on impregnated parts.
What surface finishes work on Sintered 2014 ACT4-I?
Deburr by vibratory tumbling; resin- or oil-impregnate before plating, anodizing or painting to stop chemical bleed-out; chromate/phosphate conversion coatings and impregnation-plus-hard-anodize are typical for wear surfaces.
Can Sintered 2014 ACT4-I be formed, bent or molded?
Formed by uniaxial die compaction of lubricated premix, delubrication and sintering near 590–620 °C in dry N2; density is raised by repressing/sinter-forging, and coining or sizing is used to hit tolerances.
What is the maximum service temperature of Sintered 2014 ACT4-I?
Sintered 2014 ACT4-I is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Sintered 2014 ACT6-II and Sintered 2014 ACT1-I?
ACT6-II is the default condition — the workhorse condition for sintered 2014 structural parts: full T6 strength at standard compaction density. ACT1-I: cheapest condition: as-sintered, lowest density — for lightly loaded brackets, covers and non-structural housings. Yield strength is 250 MPa in ACT6-II versus 75 MPa in ACT1-I.
Sources
- ASTM B595 — Sintered Aluminum Structural Parts — ASTM International (2020)
- MPIF Standard 35 — Materials Standards for PM Structural Parts (aluminium alloys) — Metal Powder Industries Federation (2021)
- ASM Handbook Vol. 7 — Powder Metallurgy — ASM International (2015)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (2014 data) — ASM International (1990)
- Aluminum Association Teal Sheets — 2014 composition limits — The Aluminum Association (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.