Zohre Balak - Academia.edu (original) (raw)
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Papers by Zohre Balak
Materials Research Express, 2019
Ceramics International, 2018
Investigating the effect of SPS parameters on densification and fracture toughness of ZrB 2-SiC n... more Investigating the effect of SPS parameters on densification and fracture toughness of ZrB 2-SiC n a n o c o m p o s i t e , Ceramics International,
Ceramics International, 2014
Microwave sintering has emerged in recent years as a novel method for sintering a variety of mate... more Microwave sintering has emerged in recent years as a novel method for sintering a variety of materials that have shown significant advantages against conventional sintering procedures. This work involved an investigation of microwave hybrid fast firing of alumina-zirconia nanocomposites using commercial alumina powder and monoclinic nanometric zirconia. The suspensions were prepared separately in order to obtain 5, 10 and 15 vol.% of ZrO 2 in the alumina matrix. The samples were sintered in a 2 monomode microwave furnace at 2.45 GHz in air at different temperatures in the range 1200-1400 ºC with 10 min of dwelling time and 200 ºC/min of heating rate. The effect of sintering temperature in densification, mechanical properties and microstructure behaviour of the composites was investigated. Higher density, hardness and Young's modulus, excellent fracture toughness properties and homogeneous microstructure were achieved by microwave sintering in comparison to conventional heating. Microstructure analysis showed that the alumina grains had not grown significantly, indicating that the zirconia particles provided a hindering effect on the grain growth of alumina.
International Journal of Engineering, 2012
The influence of the martensitic, martensitic+austenitic and austenitic structures during bending... more The influence of the martensitic, martensitic+austenitic and austenitic structures during bending training on two-way shape memory effect (TWSME) in Ni-50.8 at %Ti and Ni-49.9 at %Ti alloys has been studied. In addition, the effect of pre-strain, plastic strain, training cycle and training temperature on the TWSME has been investigated. Specimens were trained in martensitic, martensitic+austenitic and austenitic states with bending deformation. The results showed that in martensitic state, TWSME was more than the other states. Although the number of training cycles in martensitic state(10-15 cycle) were less than the other training methods (15-25 cycle), the obtained optimum pre-strain in martensitic state (16%) was more than other training methods (12%). In addition, it was shown that with increasing the training temperature in austenitic state, TWSME decrease.
Journal of Alloys and Compounds, 2017
Materials Research Express, 2019
Ceramics International, 2018
Investigating the effect of SPS parameters on densification and fracture toughness of ZrB 2-SiC n... more Investigating the effect of SPS parameters on densification and fracture toughness of ZrB 2-SiC n a n o c o m p o s i t e , Ceramics International,
Ceramics International, 2014
Microwave sintering has emerged in recent years as a novel method for sintering a variety of mate... more Microwave sintering has emerged in recent years as a novel method for sintering a variety of materials that have shown significant advantages against conventional sintering procedures. This work involved an investigation of microwave hybrid fast firing of alumina-zirconia nanocomposites using commercial alumina powder and monoclinic nanometric zirconia. The suspensions were prepared separately in order to obtain 5, 10 and 15 vol.% of ZrO 2 in the alumina matrix. The samples were sintered in a 2 monomode microwave furnace at 2.45 GHz in air at different temperatures in the range 1200-1400 ºC with 10 min of dwelling time and 200 ºC/min of heating rate. The effect of sintering temperature in densification, mechanical properties and microstructure behaviour of the composites was investigated. Higher density, hardness and Young's modulus, excellent fracture toughness properties and homogeneous microstructure were achieved by microwave sintering in comparison to conventional heating. Microstructure analysis showed that the alumina grains had not grown significantly, indicating that the zirconia particles provided a hindering effect on the grain growth of alumina.
International Journal of Engineering, 2012
The influence of the martensitic, martensitic+austenitic and austenitic structures during bending... more The influence of the martensitic, martensitic+austenitic and austenitic structures during bending training on two-way shape memory effect (TWSME) in Ni-50.8 at %Ti and Ni-49.9 at %Ti alloys has been studied. In addition, the effect of pre-strain, plastic strain, training cycle and training temperature on the TWSME has been investigated. Specimens were trained in martensitic, martensitic+austenitic and austenitic states with bending deformation. The results showed that in martensitic state, TWSME was more than the other states. Although the number of training cycles in martensitic state(10-15 cycle) were less than the other training methods (15-25 cycle), the obtained optimum pre-strain in martensitic state (16%) was more than other training methods (12%). In addition, it was shown that with increasing the training temperature in austenitic state, TWSME decrease.
Journal of Alloys and Compounds, 2017