Tensile strength of magnesium alloys
The tensile strength of magnesium alloys typically ranges between 115 MPa to 600 MPa, By employing rotary forging and aging processes, the tensile strength can reach 710MPa，while the yield strength falls between 70 MPa to 400 MPa. The strength of magnesium alloys is determined by factors such as alloy composition, heat treatment, and microstructural characteristics. The latest research has achieved a remarkable strength of 3.3GPa, referred to as miraculous magnesium alloys.
Alloy Composition
Common alloying elements in magnesium alloys include aluminum (Al), zinc (Zn), manganese (Mn), strontium (Sr), indium (In), and germanium (Ge). These elements contribute to increased strength through methods like solid solution strengthening, precipitation hardening, and grain refinement.
Microstructure
The microstructure of magnesium alloys involves grain size and phase composition. Smaller grain sizes with increased interface density impede dislocation movement and material slip, consequently enhancing material strength. Certain types and amounts of phases significantly augment overall strength.
Heat Treatment
Heat treatment of magnesium alloys can modify their grain structure, reduce defects, and concurrently improve their strength.
Deformation Process
Magnesium alloys can improve the crystal structure and strength of the material through forging, rolling and other processes.
Strength Characteristics of AZ31、AZ91
AZ31 alloy is an aluminum and zinc alloy known for its excellent formability and corrosion resistance. It is relatively lightweight but has lower strength.
Strength analysis: AZ31 alloy typically exhibits tensile strength ranging from approximately 215 MPa to 260 MPa and yield strength between 150 MPa to 220 MPa. These values are influenced by heat treatment and processing methods.
AZ91 alloy contains higher aluminum and zinc content compared to AZ31, hence generally demonstrating higher strength but also higher relative density.
Strength analysis: The tensile strength of AZ91 alloy usually falls between 230 MPa to 280 MPa, with yield strength around 140 MPa to 200 MPa. These values may vary due to different heat treatment methods and manufacturing processes.