scholarly journals TEM Observation of Interfaces between Particles in Al-Mg Alloy Powder Compacts Prepared by Pulse Electric Current Sintering

2002 ◽  
Vol 43 (9) ◽  
pp. 2177-2180 ◽  
Author(s):  
Guoqiang Xie ◽  
Osamu Ohashi ◽  
Norio Yamaguchi ◽  
Minghui Song ◽  
Kazuo Furuya ◽  
...  
Keyword(s):  
Electric Current ◽  
Alloy Powder ◽  
Mg Alloy ◽  
Pulse Electric Current ◽  
Powder Compacts ◽  
Pulse Electric

Behavior of Oxide Film at Interface between Particles of Al-Mg Alloy Powder Compacts Prepared by Pulse Electric Current Sintering

2003 ◽  
Vol 42 (Part 1, No. 7B) ◽  
pp. 4725-4728 ◽  
Author(s):  
Guoqiang Xie ◽  
Osamu Ohashi ◽  
Norio Yamaguchi ◽  
Minghui Song ◽  
Kazutaka Mitsuishi ◽  
...  
Keyword(s):  
Oxide Film ◽  
Electric Current ◽  
Alloy Powder ◽  
Mg Alloy ◽  
Pulse Electric Current ◽  
Powder Compacts ◽  
Pulse Electric

Formation of Al2O3 grains with different sizes and morphologies during the pulse electric current sintering process

2001 ◽  
Vol 16 (12) ◽  
pp. 3514-3517 ◽  
Author(s):  
S. W. Wang ◽  
L. D. Chen ◽  
T. Hirai ◽  
Jingkun Guo
Keyword(s):  
Electric Current ◽  
Heating Rate ◽  
Cross Sections ◽  
Mechanical Pressure ◽  
Pulse Electric Current ◽  
Side Edge ◽  
Microstructure Observation ◽  
Different Temperatures ◽  
Powder Compacts ◽  
Pulse Electric

Commercial micrometer Al2O3 powder was sintered at 1550 °C under a mechanical pressure of 30 MPa by pulse electric current sintering (PECS). Microstructure observation was performed on polished, thermal-etched cross sections parallel to the direction of mechanical pressure. Platelike Al2O3 grains formed when the powder was heated at a heating rate of 5 °C/min, while a heating rate of 200 °C/min resulted in equiaxed grains. These results indicated that PECS is an effective approach to hinder grain growth by application of a higher heating rate. However, Al2O3 grains at the upper edge were larger than those at the side edge of the samples in both cases. It implied that there were different temperatures at the upper edge and the side edge of the Al2O3 powder compacts during the PECS process.

Characterization of Interface between Particles in Al Powder Compacts by Pulse Electric Current Sintering

2003 ◽  
Vol 423-425 ◽  
pp. 97-102 ◽  
Author(s):  
Guo Qiang Xie ◽  
Osamu Ohashi ◽  
Norio Yamaguchi ◽  
Ming Hui Song ◽  
Kazuo Furuya ◽  
...  
Keyword(s):  
Electric Current ◽  
Pulse Electric Current ◽  
Al Powder ◽  
Powder Compacts ◽  
Pulse Electric

Reduction of Surface Oxide Films in Al–Mg Alloy Powders by Pulse Electric Current Sintering

2004 ◽  
Vol 19 (3) ◽  
pp. 815-819 ◽  
Author(s):  
Guoqiang Xie ◽  
Osamu Ohashi ◽  
Norio Yamaguchi ◽  
Minghui Song ◽  
Kazutaka Mitsuishi ◽  
...  
Keyword(s):  
Electric Current ◽  
Thermodynamic Calculation ◽  
Particle Surface ◽  
Oxide Films ◽  
Surface Oxide ◽  
Mg Alloy ◽  
Pulse Electric Current ◽  
Transmission Electron ◽  
Pulse Electric ◽  
Mg Content

The reduction mechanism of particle surface oxide films on Al–Mg alloy specimens sintered by the pulse electric current sintering (PECS) process was investigated via transmission electron microscopy, energy dispersive x-ray spectroscopy, and thermodynamic calculation. The reduction products were either MgAl2O4 or MgO or both, which is dependent on the sintering temperature and Mg content in Al–Mg alloy. Comparing the experimental temperature of the reduction products with that from thermodynamic calculation, it was suggested that the temperature at interfaces between particles was higher than that inside particles. This difference of temperature enhanced reduction of surface oxide films of Al–Mg alloy powders and hence accelerated the sintering in the PECS process.

Reduction mechanism of surface oxide films and characterization of formations on pulse electric-current sintered Al–Mg alloy powders

2005 ◽  
Vol 241 (1-2) ◽  
pp. 102-106 ◽  
Author(s):  
Guoqiang Xie ◽  
Osamu Ohashi ◽  
Minghui Song ◽  
Kazutaka Mitsuishi ◽  
Kazuo Furuya
Keyword(s):  
Electric Current ◽  
Oxide Films ◽  
Surface Oxide ◽  
Mg Alloy ◽  
Reduction Mechanism ◽  
Pulse Electric Current ◽  
Pulse Electric

scholarly journals Effect of Mg on the Sintering of Al-Mg Alloy Powders by Pulse Electric-Current Sintering Process

2004 ◽  
Vol 45 (3) ◽  
pp. 904-909 ◽  
Author(s):  
Guoqiang Xie ◽  
Osamu Ohashi ◽  
Takahiro Sato ◽  
Norio Yamaguchi ◽  
Minghui Song ◽  
...  
Keyword(s):  
Electric Current ◽  
Mg Alloy ◽  
Sintering Process ◽  
Pulse Electric Current ◽  
Pulse Electric

Heterogeneous of Non-Conductive Materials Sintering by Pulse Electric Current

2002 ◽  
Vol 224-226 ◽  
pp. 729-734 ◽  
Author(s):  
Dong Ming Zhang ◽  
Zheng Yi Fu ◽  
Yung Cheng Wang ◽  
Qing Jie Zhang ◽  
Jing Kun Guo
Keyword(s):  
Electric Current ◽  
Conductive Materials ◽  
Pulse Electric Current ◽  
Pulse Electric
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