Magnesium Machining & Suppliers in Memphis, TN

Magnesium itself in solid bar or plate form is not especially hazardous, but the chips, dust, and fine particles produced during machining are flammable and can ignite from the heat of cutting, a spark, or friction. Once ignited, magnesium burns extremely hot and, critically, cannot be extinguished with water — water reacts with burning magnesium to release hydrogen and intensify the fire, and ordinary fire extinguishers are likewise ineffective or dangerous. Magnesium fires require Class D extinguishing agents or dry sand. Fine dust and small chips are the most dangerous because they have the most surface area and ignite most readily, so shops that machine magnesium safely focus on minimizing fine-particle generation (sharp tooling, adequate chip load, proper feeds), controlling and removing chip accumulation, managing dust, and keeping Class D suppression on hand. They also avoid water-based coolants, which can react with magnesium, running dry or with mineral-oil coolant instead. None of this makes magnesium unmachinable — it actually machines very easily and gives excellent finishes — but it demands a shop that takes the fire hazard seriously and has established safe practices. A shop without magnesium-specific experience and suppression should never machine it.

The choice depends on the manufacturing process and the strength needed. For wrought products — sheet, plate, and extrusions that will be machined or formed — AZ31B is the most common general-purpose magnesium alloy, offering good formability and moderate strength. For die-cast components, AZ91D is the workhorse, providing good castability, strength, and corrosion resistance, and it's widely used for automotive housings, brackets, and covers produced in volume. When higher strength is required, ZK60 (a magnesium-zinc-zirconium alloy) offers improved mechanical properties for more demanding wrought applications. AM-series alloys like AM60 are chosen for die castings needing better ductility and impact resistance, such as some structural automotive parts. The alloys differ meaningfully in strength, corrosion behavior, and how they're produced, so they aren't interchangeable. The biggest factor is usually whether your part is cast or wrought-and-machined, which narrows the choice immediately. When requesting quotes on app.mfgbase.com, specify the alloy and form (and whether the part is cast or machined from wrought stock) so suppliers can confirm the material fits both the process and the performance requirement.

Magnesium is chemically active and corrodes readily without protection, and it's especially vulnerable to galvanic corrosion, which is corrosion accelerated when magnesium contacts a more noble metal like steel or aluminum in the presence of moisture. So magnesium parts almost always need both a protective surface treatment and corrosion-aware design. Surface treatments include chromate conversion coatings and anodize-type treatments specific to magnesium, which provide a protective layer and a good base for subsequent primer and paint — bare magnesium is rarely left exposed in service. Just as important is managing dissimilar-metal contact: at any joint where a steel fastener or aluminum component meets the magnesium, the design should isolate the metals using compatible fasteners, insulating washers, sealants, or coatings to break the galvanic circuit. An experienced magnesium supplier will flag these galvanic risks during design review and recommend specific isolation measures, which is part of the value of sourcing from a shop that genuinely knows the material. Ask for documentation of whatever conversion coating or treatment is applied, and discuss the part's service environment so the protection system matches the exposure. Skipping corrosion protection is one of the most common ways magnesium parts fail prematurely in the field.

Only when weight reduction is genuinely critical and justifies the tradeoffs, which is exactly why magnesium is a deliberate engineering choice rather than a default. Magnesium is roughly one-third lighter than aluminum, so for parts where shaving mass directly improves performance, fuel economy, or handling — and where that benefit outweighs cost — it can be the right call. But the downsides are real: magnesium raw material costs more than aluminum, the safe-machining requirements limit you to a smaller pool of qualified shops and can raise processing cost, it corrodes more readily and needs protective treatment and galvanic isolation, and it has lower stiffness and strength than many aluminum alloys, requiring design adjustments. For most weight-sensitive parts, aluminum (especially 6061 or 7075) delivers most of the benefit at lower cost and complexity, which is why aluminum dominates lightweighting. Magnesium makes sense when the application truly needs that last increment of weight savings and the part can be designed and protected appropriately. The practical approach is to evaluate whether an aluminum alloy can meet your weight target first; if it can't and the weight reduction is worth the premium, then magnesium is justified — and you should source it from a Memphis shop with proven magnesium experience and proper safety practices.