Microstructure and properties of the Ti/Al2O3/NiCr composites fabricated by explosive compaction/cladding.
Titanium/aluminum oxide/nickel chromium (Ti/Al2O3/NiCr) composite bar prepared by explosive compaction/cladding technique represents a new kind of sandwich-structural composites for medical application. Formation of the interfaces of Ti/Al2O3 and Al2O3/NiCr govern the properties of the composite material. The electrical resistivity and microstructure of the intermediate layer and the interfaces of the Ti/Al2O3/NiCr explosive compaction/cladding bar are investigated by means of four-point probe analysis, optical microscopy, scanning electron microscopy, electron microprobe analysis, and X-ray diffraction. The Ti/Al2O3/NiCr composite bar is characterized by the consolidated ceramic intermediate layer and the metallurgical bonding interfaces. The intermediate ceramic layer plays a role of insulation and thermal conductance in this composite. The average shear strength of the composite bar is about 9.36 MPa. The heat affected zone characterized by relatively larger sizes of grains is distinguished from the other part of the Ti tube. The intermetallics AlTi3 and Al0.9Ni4.22 are generated at the intermediate ceramic layer. Formation mechanism of the interfaces of the explosive compaction/cladding bar are described.
School of Materials Science and Engineering, Central South University, Changsha, Hunan, People's Republic of China; Departments of Mechanical and Aerospace Engineering and Nanoengineering, University of California, San Diego, United States; Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, Hunan, People's Republic of China. Electronic address: biw009@ucsd.edu.
Bingfeng
B
Wang
School of Materials Science and Engineering, Central South University, Changsha, Hunan, People's Republic of China.
Fangyu
F
Xie
Departments of Mechanical and Aerospace Engineering and Nanoengineering, University of California, San Diego, United States.
Bin
B
Wang
School of Materials Science and Engineering, Central South University, Changsha, Hunan, People's Republic of China.
Xiaozhou
X
Luo
D000537:Aluminum Oxide / Q000737:chemistry*; D002858:Chromium Alloys / Q000737:chemistry*; D019245:Compressive Strength; D017097:Electric Impedance; D004577:Electron Probe Microanalysis; D008422:Materials Testing / Q000379:methods*; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D002858:Chromium Alloys; C066018:nichrome; D014025:Titanium; D000537:Aluminum Oxide
Composite; Electron microprobe analysis; Explosive cladding; Interface