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Aluminum ADC12 vs. PCB Board FR-4, 2 copper planes

Compare Aluminum ADC12 vs. PCB Board FR-4, 2 copper planes strength, stiffness, weight and thermal properties.

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Aluminum ADC12Cast
PCB Board FR-4, 2 copper planesComposite
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Mechanical
Yield strength149MPasourceone test result, 0.2% proof stress, as cast, ASTM tensile bar (Daiki)not given (tensile used)
Ultimate tensile strength345MPasourceone test result, as cast, ASTM tensile bar (Daiki)246–385MPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D3039)
Elongation at break2.3%sourceone test result, as cast, ASTM tensile bar (Daiki)not sourced
Young's modulus (stiffness)79.8GPasourcestandard value (S.S.Aluminum)21.9–25.8GPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D790-15e2); the copper planes are left out
Density2,680kg/m³sourcemeasured (Daiki)not sourced
Strength to weight55.6kN·m/kgnot sourced
Stiffness to weight29.8MN·m/kgnot sourced
Poisson's rationot sourced0.171–0.177sourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction
Shear modulusnot sourced10.2GPa
Bulk modulusnot sourced12.2GPa
Speed of sound5,457m/snot sourced
Thermal
Thermal conductivity125W/m·Ksourcemeasured on specimens cut from a 50 x 100 x 5 mm flat die casting (Daiki)not sourced
Thermal expansion21µm/m·Ksourcemeasured, temperature range not stated (Daiki)13–14µm/m·Ksourcethe bare laminate's (fr4-370hr), in-plane X/Y-axis, below Tg (IPC-TM-650 2.4.24C)
100 mm part over a 50 °C swing105µm growth67.5µm growth1.56x less
Specific heat911J/kg·Ksourcemeasured (Daiki)not sourced
Heats up and cools (diffusivity)51.2mm²/snot sourced
Thermal shock resistancenot sourcednot sourced
Melting point515–582°Csourcesolidus-liquidus (Daiki)not sourced
Values forJIS ADC12 (Al-Si-Cu, about A383 / EN AC-46100) high-pressure die-casting alloy, as cast; physical properties from Daiki Aluminium Industry (ADC12 ingot producer) measured values; modulus from S.S.Aluminum (ADC12 ingot producer) standard values.A whole circuit board read as one orthotropic plate: the JEDEC high-K thermal test board (JESD51-7, "2s2p"), 0.062 in (1.575 mm) thick with two internal solid copper planes 0.0014 in (1 oz) thick, as Texas Instruments SZZA017A Table 1 gives it. Copper C110 and the Isola 370HR laminate from this library; the layers conduct in parallel along the board and in series through it (boardStackup.ts). Its two 0.0028 in trace layers cover little of the board and are left out; vias are ignored. Mechanical values are the bare laminate's.

Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

Questions

Is Aluminum ADC12 stronger than PCB Board FR-4, 2 copper planes?

PCB Board FR-4, 2 copper planes is stronger: its tensile strength is 315 MPa against yield strength 149 MPa for Aluminum ADC12 (2.12x).

Which is stiffer, Aluminum ADC12 or PCB Board FR-4, 2 copper planes?

Aluminum ADC12 is stiffer: Young's modulus 79.8 GPa against 23.9 GPa for PCB Board FR-4, 2 copper planes, so the same part in Aluminum ADC12 deflects less under the same load.

Which expands less with temperature?

PCB Board FR-4, 2 copper planes expands less: 13.5 µm/m·K against 21 µm/m·K for Aluminum ADC12.

Among 73 materials

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Stiffness against density
1k10k101001kDensity (kg/m³)Yield strength (MPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonRubberAluminumSteelIronTitaniumSteel AISI 1018Stainless Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic PTFEPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLA Resin Elastic 50ASLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelBrickPCB Laminate FR-4SiliconCeramic Alumina 96%Aluminum A380Aluminum 6063-T6Aluminum 1100-OMagnesium AZ91DSolder SAC305Plastic PBT GF30Plastic PPS GF40Plastic LCP GF30Aluminum ADC12
Strength against density

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