Die-cast magnesium alloy materials suitable for lightweight die-cast housings, electronic product structural parts, automotive lightweight parts, drone structural parts, handheld device housings, and medium to low load metal functional parts.
Magnesium alloy AZ91D is a commonly used die-cast magnesium alloy material, mainly composed of magnesium, aluminum, zinc, and other elements. It features low density, light weight, good die-casting moldability, good dimensional stability, and good vibration damping performance. It is commonly used in lightweight housings, electronic product housings, automotive parts, drone structural components, instrument housings, handheld device housings, and metal structural parts that require weight reduction. Compared to aluminum alloy, the AZ91D is lighter; Compared to engineering plastics, it offers better metallic texture, rigidity, and heat dissipation.
By focusing on application scenarios, boundaries of advantages, and non-recommended scenarios, it helps sales, customer service, and quoting staff quickly determine whether the material meets current part requirements.
Lightweight, low density, good die-casting moldability, suitable for thin-walled complex structures, excellent vibration damping performance, superior heat dissipation than most plastics, good metallic texture, suitable for lightweight design, and suitable for mass die-casting production.
Electronic product housings, laptop housings, camera housings, handheld device housings, drone structural parts, automotive lightweight brackets, automotive interior structural parts, instrument housings, communication equipment housings, medical equipment housings, sports equipment accessories, lightweight mounting seats, small die-cast structural parts.
Highly corrosive environment parts, long-term exposed outdoor parts, high-temperature long-term load-bearing parts, high-strength heavy-duty structural parts, high-wear moving parts, high-elasticity snap-fit parts, food direct contact parts, medical implant parts, strong acid and strong alkali environment parts, parts requiring welded structural strength, parts with extremely high fire safety requirements and no protective design.
The following parameters come from product information and material knowledge fields, used for design review, quotation communication, and preliminary judgment before material selection.
| Material positioning | Die-cast magnesium alloy materials suitable for lightweight die-cast housings, electronic product structural parts, automotive lightweight parts, drone structural parts, handheld device housings, and medium to low load metal functional parts. |
|---|---|
| Precision performance | Magnesium alloy AZ91D is suitable for die casting, with good dimensional repeatability for batch parts, and strong ability to form complex shells and thin-walled structures. Actual accuracy is affected by mold accuracy, die casting process, part dimensions, wall thickness distribution, demolding angle, post-processing, and surface treatment. Key assembly surfaces, positioning holes, threaded holes, sealing surfaces, and high-precision hole positions usually require CNC finishing after die casting. |
| Dimensional tolerances | The standard dimensional tolerances for magnesium alloy AZ91D die-cast parts can be referenced ± 0.10mm-±0.30mm. Small structural parts and molds with good control make dimensional stability easier; Large components, thin-walled parts, complex structural parts, and multiple post-processing parts may reach ±0.30mm-±0.80mm or higher. CNC post-machining positions can achieve higher precision. This value is a standard reference range and does not guarantee absolute tolerances for all structures; key dimensions are recommended to be guaranteed through post-processing. |
| Minimum Wall Thickness | For small parts in the AZ91D die-casting, local wall thickness can be referenced as 1.0mm-1.5mm, but it is not recommended to use large areas with overly thin wall thickness. Walls that are too thin easily cause insufficient filling, cold insulation, deformation, insufficient strength, and coating defects. The load-bearing structure, mounting positions, and large housing should be appropriately thickened. |
| Recommended wall thickness | Standard die-cast shells and structural parts are recommended with wall thicknesses of 1.5mm-2.5mm; small thin-walled shells can be designed to 1.2mm-2.0mm depending on structure and mold capacity; installation bases, screw posts, reinforcement rib roots, and load-bearing positions are recommended 2.0mm-3.5mm, and stress concentration is reduced through fillets, ribs, and transition structures. |
| Minimum aperture | The recommended hole size for die casting is no less than 1.5mm-2.0mm. Smaller holes, deep holes, precision holes, and threaded holes are recommended to be achieved through post-processing. Mold core-pulling holes need to consider core-pulling strength, demolding angle, hole depth, and mold lifespan. It is recommended to reserve machining allowance for positioning holes, threaded bottom holes, and assembly holes. After die-casting, drilling, reaming, or tapping is recommended. |
| Assembly clearance | For ordinary die-cast parts, it is recommended to reserve 0.15mm-0.40mm on one side; for unmachined die-cast surface assembly, it is recommended to appropriately increase the gap; for movable fits, it is recommended to reserve 0.30mm-0.60mm on one side. If painting, powder spraying, electrophoresis, or micro-arc oxidation are needed later, additional consideration should be given to coating thickness and surface roughness to avoid over-tightening or scratching the coating. |
| Detailed performance | AZ91D die casting is suitable for realizing rib positions, column positions, steps, mounting seats, shallow textures, markings, and complex shell structures. Fine text, logos, and decorative textures should avoid being too shallow or too fine; it is recommended that raised or recessed details should be no less than 0.3mm-0.5mm. High-precision exterior textures, precise markings, and decorative effects can be achieved through mold etching, spraying, screen printing, laser engraving, or post-processing. |
| Surface effect | The original die-cast surface of magnesium alloy AZ91D is typically silver-gray or gray-white metallic, and may have parting lines, ejector pin marks, flow marks, fluff, and localized die-cast textures. After sandblasting or shot blasting, a uniform matte metallic finish is achieved; After painting, powder spraying, or electrophoresis, more stable colors and protective effects can be achieved; Micro-arc oxidation can improve surface hardness and corrosion resistance. For exterior parts, spraying or other surface protection treatments are usually recommended. |
Based on material characteristics and suitable product ranges, customer needs are broken down into easier application directions to determine.
Electronic product housings, laptop housings, camera housings, handheld device housings, drone structural parts, automotive lightweight brackets, automotive interior structural parts, instrument housings, communication equipment housings, medical equipment housings, sports equipment accessories, lightweight mounting seats, small die-cast structural parts.
Die-cast magnesium alloy materials suitable for lightweight die-cast housings, electronic product structural parts, automotive lightweight parts, drone structural parts, handheld device housings, and medium to low load metal functional parts.
The biggest feature of magnesium alloy AZ91D is its obvious lightweight advantage, making it suitable for replacing some aluminum alloy, zinc alloy, or plastic structural parts in weight-sensitive products. It has good flow in die casting, making it suitable for forming thin-walled, rib-shaped, column-shaped, and complex shell structures. AZ91D has superior rigidity and metallic feel compared to most plastics, but it requires higher corrosion resistance and surface protection. When exposed in use, it is prone to oxidation or corrosion, requiring surface treatments such as spraying, electrophoresis, chemical conversion films, and micro-arc oxidation.
Based on wall thickness, hole position, assembly clearance, dimensional tolerances, and material usage risks, determine in advance whether the part structure is suitable for Magnesium Alloy AZ91D.
Post-processing of Magnesium Alloy AZ91D affects appearance, dimensions, hole position, assembly clearance, and usage validation results, and should be explained in advance during quotation, DFM review, and sample confirmation stages.
Post-processing should focus on appearance display, dimensional fitting, connection assembly, and testing verification. Parts involving assembly positions need to be reserved in advance for machining, coating, and trial assembly allowances.
For common issues such as threads, snaps, strength, temperature resistance, and weather resistance, identify in advance whether the material needs to be replaced or if another processing method should be used.
When customer demand exceeds Magnesium Alloy AZ91D material boundaries, it is necessary to combine strength, temperature resistance, toughness, long-term stability, and mass production goals to promptly recommend alternative materials or processing technologies.
If better corrosion resistance and general processing capability are required,6061 Aluminum Alloy or 5052 can be chosen; If mass production of die casting is needed and costs are more controllable, ADC12 Aluminum Alloy or zinc alloys can be chosen; If higher strength and temperature resistance are required,7075 Aluminum Alloy, TC4 Titanium Alloy (Ti-6Al-4V), or stainless steel can be chosen; If only appearance and structural verification are needed, photosensitive resin, nylon, or CNC aluminum alloy can be chosen; If higher weight reduction is needed but the cost is acceptable, other high-performance magnesium alloy grades can be further evaluated.
If customers mainly care about lightweight, thin-walled die casting, metal shell texture, and mass production efficiency, the magnesium alloy AZ91D is a more suitable choice. If customers are more concerned about long-term outdoor corrosion resistance, high strength load-bearing, wear resistance, or high-temperature stability, they should prioritize aluminum alloy, stainless steel, titanium alloy, or other more suitable engineering materials. The AZ91D is suitable for "lightweight enclosures and medium to low load structural components," but not for "highly corrosive, high-temperature, and heavy-duty structural components."
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