1. History of Bulk Amorphous Alloys 2. High Glass-Forming Ability and its Dominant Factors 3. Compositional Dependence of the Dominant Factors for GlassFormation, Tx and Tg/Tm. 3.1. Ln-Al-(Ni,Cu) Systems 3.2. Mg-Ln-(Ni,Cu) Systems 3.3. Zr-Al-TM Systems 3.4. Pd-Cu-Ni-P System 4. Continuous Cooling Transformation Behavior of SupercooledLiquid and Critical Cooling Rate for Glass Formation 5. Preparation Methods of Bulk Amorphous Alloys. 5.1. High-Pressure Die Casting Method. 5.2. Water Quenching Method 5.3. Copper Mold Casting Method 5.4. Arc Melting Method 5.5. Unidirectional Zone Melting Method 5.6. Suction Casting Method 6. Compositional Dependence of Maximum Sample Thickness (tmax). 6.1. La-Al-(Co,Ni,Cu) Systems 6.2. Zr-Al-(Co,Ni,Cu) Systems 6.3. Zr-Al-Ni-Cu-TM (TM = Transition Metals) Systems 7. Structure of Bulk Amorphous Alloys. 7.1. Mg-La-Ni System 7.2. La-Al-Ni System 7.3. Zr-Al-Ni System 7.4. Zr-Y-Al-Ni System 8. Structural Relaxation and Thermal Stability. 8.1. Structural Relaxation 8.2. Glass Transition 8.3. Two-Stage Glass Transition 8.4. Crystallization Behavior 9. Physical Properties. 9.1. Density 9.2. Specific Heat 9.3. Viscosity 9.4. Atomic Diffusivity 9.5. Electrical Resistivity 9.6. Thermal Expansion

Bulk Amorphous Alloys : preparation and Fundamental Characteristics

Friction Stir Welding of Al Alloy Thin Plate by Rotational Tool without Pin

Zr 55 Cu 30 Al 10 Ni 5 bulk metallic glass (BMG) plate and pure copper plates with 2 mm in thickness were successfully joined by friction stir butt welding. Microstructure characterization revealed that a clear interface between the two materials was formed in the stir zone and no crystallization from the amorphous phase can be detected. On the copper side in the stir zone, a transitional microstructure of refined elongated grain structure, refined equiaxial grain structure and coarse equiaxial grain structure was found varying with the distance from the BMG/Cu interface. The welded joint showed lower hardness than that of the base metals and finally fractured on the copper side in tensile tests. The ultimate tensile strength of the joint was about 253 MPa, which reached up to 95% of the pure copper.

http://www.jwri.osaka-u.ac.jp/~dpt9/BMG-Cu.pdf

Microstructure and mechanical properties of friction stir welded joint of Zr55Cu30Al10Ni5 bulk metallic glass with pure copper

Joining of Zr51Ti5Ni10Cu25Al9 BMG to aluminum alloy by friction stir welding

Specific heat capacities of Fe–Co–Cr–Mo–C–B–Y bulk metallic glasses and their correlation with glass-forming ability

Friction Stir Welding of Zr55Al10Ni5Cu30 Bulk Metallic Glass to Crystalline Aluminum

The invention relates to a technology for connecting a blocky amorphous alloy and different materials such as Al, and the like, in particular to a method for stir connection of a blocky amorphous alloy and different metal materials by carrying out connection processing on an amorphous alloy supercooled liquid region by using a friction stir welding method Based on the friction stir welding principle, a plastic softened layer is formed on a weld metal through the friction heat generated among a stirring welding needle, a shaft shoulder and a workpiece, and the weld metal is subjected to plastic fusion and connected into a whole The amorphous alloy in the supercooled liquid region has favorable deformation and viscous flow change character, therefore, it is proposed that the amorphous alloy can reach the temperature of the supercooled liquid region by the heat generated by friction stir welding, thereby entering a viscous flow change state; and then the connection of the amorphous alloy is realized by stirring of a stirrer The invention develops a new method for connecting blocky amorphous alloys, thereby widening the application field of the blocky amorphous alloys in engineering

Zuoxiang Qin

Papers

Friction Stir Welding of Zr55Al10Ni5Cu30 Bulk Metallic Glass to Crystalline Aluminum

Friction stir connecting method of amorphous alloy and different metal materials