Authors: Yuhua Liu Jiandong Hu Ping Shen Zuoxing Guo Huijie Liu
Publish Date: 2013/04/02
Volume: 22, Issue: 9, Pages: 2602-2609
Abstract
ZrO2 was brazed to Ti6Al4V using a Zr55Cu30Al10Ni5 at amorphous filler in a high vacuum at 11731273 K The influences of brazing temperature holding time and cooling rate on the microstructure and shear strength of the joints were investigated The interfacial microstructures can be characterized as ZrO2/ZrO2−x + TiO/ZrTi2CuNi/ZrTi2CuNiAl/acicular Widmanstäten structure/Ti6Al4V With the increase in the brazing temperature both the thickness of the ZrO2−x + TiO layer and the content of the ZrTi2CuNi phase decreased However the acicular Widmanstäten structure gradually increased With the increase in the holding time the ZrTi2CuNi phase decreased and the thickness of the ZrTi2CuNi + ZrTi2CuNiAl layer decreased In addition cracks formed adjacent to the ZrO2 side under rapid cooling The microstructures produced under various fabrication parameters directly influence the shear strength of the joints When ZrO2 and Ti6Al4V couples were brazed at 1173 K for 10 min and then cooled at a rate of 5 K/min the maximum shear strength of 95 MPa was obtainedThis study was supported by 2012 Open Foundation of the Key Lab of Automobile Materials Jilin University from the Natural Scientific Basic Research Fund for Platform and Base Construction Grant No 12450060481229 the State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology No AWPTZ03 and by the Department of Science Technology of Jilin Province Grant No 20100545
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