Magnesium-zirconium (MgZr) master alloy，Magnesium zirconium Alloy，MgZr alloy，MgZr30 alloy,E FOUR

### **Magnesium-Zirconium (MgZr) Master Alloy** **Product Overview** Magnesium-Zirconium Master Alloy, commonly designated as MgZr Alloy (with MgZr30 representing a 30% Zr variant), is a premium grain refining agent specifically developed for magnesium alloys. Zirconium serves as the most effective grain refiner for magnesium alloys that do not contain aluminum, silicon, or manganese, with which it forms stable compounds. This master alloy is essential for producing fine-grained, high-strength magnesium alloys with improved mechanical properties, enhanced castability, and reduced porosity. The alloy is typically supplied in granular form, ingots, or crushed fractions to ensure rapid dissolution and homogeneous distribution in magnesium melts. --- #### **1. Chemical Composition** MgZr Master Alloy is characterized by high zirconium content dispersed in a magnesium matrix. | Element | Composition (% by Weight) | | :---------------- | :-------------------------------- | | **Zirconium (Zr)** | 25.0 - 35.0 % (MgZr30: ~30% Zr) | | **Magnesium (Mg)** | 60.0 - 70.0 % | | **Zinc (Zn)** | ≤ 0.20 % | | **Iron (Fe)** | ≤ 0.05 % | | **Nickel (Ni)** | ≤ 0.005 % | | **Copper (Cu)** | ≤ 0.03 % | | **Silicon (Si)** | ≤ 0.03 % | | **Aluminum (Al)** | ≤ 0.10 % | | **Other Impurities** | ≤ 0.30 % (each) | *Note:* The **zirconium** exists as fine intermetallic particles within the magnesium matrix. The high zirconium content (typically 25-35%) ensures efficient grain refinement with minimal addition to the melt. The strict control of **aluminum** and **silicon** is critical as these elements impair zirconium's grain refining efficiency. --- #### **2. Physical & Mechanical Properties** The physical properties are dominated by the high zirconium content. **Physical Properties:** * **Density:** 2.4 - 2.8 g/cm³ (varies with Zr content) * **Melting Range:** 650 - 900 °C (1202 - 1652 °F) * **Appearance:** Dark gray granular or ingot material * **Solubility in Magnesium:** Complete dissolution at standard casting temperatures **Effect on Final Magnesium Alloys:** When properly added to magnesium alloys, MgZr Master Alloy provides: * **Exceptional Grain Refinement:** Reduces grain size by 80-90% * **Mechanical Property Enhancement:** Increases strength by 20-40% and ductility by 50-100% * **Porosity Reduction:** Significantly decreases casting porosity * **Hot Tearing Resistance:** Improves resistance to hot cracking during solidification * **Surface Quality Improvement:** Enhances surface finish of cast components --- #### **3. International Standards & Specifications** MgZr Master Alloy is recognized under various international and proprietary specifications. * **ASTM International:** **ASTM B951** (Standard Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys) * **ISO Standards:** **ISO 16220** (Magnesium and magnesium alloys - Castings) * **SAE International:** **SAE J465** * **DIN Standards:** **DIN 1729-2** * **Proprietary Designation:** **MgZr30** (for 30% Zr content) * **Custom Specifications:** Often produced according to customer-specific requirements --- #### **4. Product Applications** MgZr Master Alloy is indispensable for high-performance magnesium alloy production. * **Zirconium-Containing Magnesium Alloys:** * **Mg-Zn-Zr Alloys** (e.g., ZK51, ZK61) * **Mg-RE-Zr Alloys** (e.g., EZ33, ZE41) * **Mg-Ag-RE-Zr Alloys** (e.g., QE22) * **Mg-Y-RE-Zr Alloys** (e.g., WE43, WE54) * **Aerospace and Defense:** * **Aircraft Engine Components** * **Missile and Defense System Parts** * **Helicopter Transmission Components** * **Satellite Structural Components** * **Racing and High-Performance Automotive:** * **Formula 1 Components** * **Racing Engine Parts** * **High-Performance Suspension Components** * **Motorcycle Racing Components** * **Specialized Industrial Applications:** * **Nuclear Reactor Components** * **High-Temperature Process Equipment** * **Precision Instrument Components** * **Medical Equipment Parts** --- #### **5. Usage Guidelines and Processing** **Typical Addition Rates:** * **Standard Grain Refinement:** 0.3 - 0.7% of total melt weight * **High-Performance Applications:** 0.7 - 1.2% of total melt weight * **Maximum Recommended:** 1.5% of total melt weight **Processing Parameters:** * **Optimal Processing Temperature:** 720 - 780 °C (1328 - 1436 °F) * **Contact Time:** 15 - 30 minutes before pouring * **Mixing:** Vigorous mechanical stirring recommended * **Atmosphere Control:** Protective atmosphere (SF₆, SO₂, or Argon) essential * **Alloy Compatibility:** Not suitable for aluminum-containing magnesium alloys --- **Summary** **Magnesium-Zirconium Master Alloy (MgZr Alloy)** represents the gold standard in grain refinement technology for magnesium alloys. The exceptional grain refining capability of **zirconium**, achieving grain size reductions of up to 90%, makes this master alloy indispensable for producing high-integrity magnesium components across aerospace, defense, and high-performance automotive sectors. The **MgZr30 variant** with approximately 30% zirconium content offers optimal efficiency for most industrial applications. While incompatible with aluminum-containing magnesium alloys, MgZr Master Alloy delivers unparalleled results in zirconium-compatible systems, transforming ordinary castings into premium components with superior mechanical properties, reduced porosity, and enhanced reliability. Its critical role in manufacturing high-performance magnesium components ensures continued demand in applications where weight reduction, structural integrity, and performance cannot be compromised.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3442 gallon liquid totes Special package is available on request.