scholarly journals Thermodynamic study of the alpha beta phase transformation in titanium by a pulse heating method

1978 ◽  
Vol 83 (2) ◽  
pp. 127 ◽  
Author(s):  
A. Cezairliyan ◽  
A.P. Miiller
Keyword(s):  
Phase Transformation ◽  
Pulse Heating ◽  
Beta Phase ◽  
Thermodynamic Study ◽  
Heating Method ◽  
Alpha Beta

Effect of Deposition Conditions on Intrinsic Stress, Phase Transformation and Stress Relaxation in Tantalum Thin Films

1991 ◽  
Vol 239 ◽  
Author(s):  
A. Mutscheller ◽  
L. A. Clevenger ◽  
J.M.E. Harper ◽  
C. Cabrai ◽  
K. Barmakt
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Phase Transformation ◽  
Stress Relaxation ◽  
Compressive Stress ◽  
Stress Relief ◽  
Beta Phase ◽  
Alpha Phase ◽  
Intrinsic Stress

AbstractWe demonstrate that the high temperature polymorphic tantalum phase transition from the tetragonal beta phase to the cubic alpha phase causes complete stress relaxation and a large decrease in the resistance of tantalum thin films. 100 nm beta tantalum thin films were deposited onto thermally oxidized <100> silicon wafers by dc magnetron sputtering with argon. In situ stress and resistance at temperature were measured during temperature-ramped annealing in purified He. Upon heating, films that were initially compressively stressed showed increasing compressive stress due to thermo-elastic deformation from 25 to 550°C, slight stress relief due to plastic deformation from 550 to 700°C and complete stress relief due to the beta to alpha phase transformation at approximately 700–800°C. Incomplete compressive stress relaxation was observed at high temperatures if the film was initially deposited in the alpha phase or if the beta phase did not completely transform into alpha by 800°C. This incomplete beta to alpha phase transition was most commonly observed on samples that had radio frequency substrate bias greater than -100 V. We conclude that the main stress relief mechanism for tantalum thin films is the beta to alpha phase transformation that occurs at 700 to 800°C.

scholarly journals High Temperature Thermal Diffusivity Measurement for FeO Scale by Electrical-Optical Hybrid Pulse-Heating Method

2018 ◽  
Vol 58 (12) ◽  
pp. 2186-2190 ◽  
Author(s):  
Yuanru Yang ◽  
Hiromichi Watanabe ◽  
Mitsutoshi Ueda ◽  
Miyuki Hayashi ◽  
Masahiro Susa ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Pulse Heating ◽  
Thermal Diffusivity Measurement ◽  
Heating Method ◽  
Diffusivity Measurement
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