scholarly journals Influence of the Isothermal Annealing on the Free Volume Changes in Thermo-Shrunken Polyethylene by Positron Annihilation

2001 ◽  
Vol 99 (3-4) ◽  
pp. 447-454 ◽  
Author(s):  
W. Osoba
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Isothermal Annealing ◽  
Volume Changes

Relaxation Behavior of Zr-Cu-Al Ternary Bulk Glassy Alloy Studied by Using Positron Annihilation Techniques

2010 ◽  
Vol 654-656 ◽  
pp. 1070-1073 ◽  
Author(s):  
Akito Ishii ◽  
Shinya Mineno ◽  
Akihiro Iwase ◽  
Yokoyama Yoshihiko ◽  
Toyohiko J. Konno ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Isothermal Annealing ◽  
Glassy Alloy ◽  
Volume Ratio ◽  
Charpy Impact ◽  
Volume Changes ◽  
Appreciable Change ◽  
Positron Annihilation Lifetime ◽  
Bulk Glassy Alloy

Zr-based bulk glassy (BG) alloys show high tensile strength and a high Charpy impact value. In this study, the free volume changes for the hypoeutectic Zr60Cu30Al10 BG alloy during isothermal annealing below glass transition temperature (Tg) have been investigated by positron annihilation lifetime and coincidence Doppler broadening (CDB) measurements. The positron lifetime of hypoeutectic and eutectic BG alloys is almost the same, although the atomic volume ratio, estimated by the density for the eutectic BG alloy is different from that for the hypoeutectic BG alloy. The CDB spectra show a marked difference between eutectic and hypoeutectic BG alloys; that is, the spectrum of the hypoeutectic BG alloy is closes to that of Zr metal than that of the eutectic BG alloy. This result exhibits that the elemental fraction of Zr atoms around free volume in hypoeutectic BG alloy is greater than that in eutectic BG alloy. The CDB ratio profiles for the hypoeutectic BG alloy during annealing shows no appreciable change. The same trend was observed in the eutectic BG alloy.

Positron Annihilation Lifetime Studies on Free Volume Changes in Polymers by CO2 Conditioning

1994 ◽  
Vol 175-178 ◽  
pp. 789-792 ◽  
Author(s):  
K. Tanaka ◽  
M. Ito ◽  
Hideki Kita ◽  
Katsutomo Okamoto ◽  
Yasuo Ito
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Volume Changes ◽  
Positron Annihilation Lifetime ◽  
Lifetime Studies

Positron annihilation lifetime studies of free volume changes in polycarbonate under static tensile deformation

1992 ◽  
Vol 25 (9) ◽  
pp. 2407-2411 ◽  
Author(s):  
M. Y. Ruan ◽  
H. Moaddel ◽  
A. M. Jamieson ◽  
R. Simha ◽  
J. D. McGervey
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Tensile Deformation ◽  
Volume Changes ◽  
Positron Annihilation Lifetime ◽  
Static Tensile ◽  
Lifetime Studies
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