Investigation of Precipitation in Aluminum-Copper alloy using positron annihilation lifetime technique

2008 ◽  
Vol 31 (2) ◽  
pp. 185-193
Keyword(s):  
Positron Annihilation ◽  
Copper Alloy ◽  
Positron Annihilation Lifetime ◽  
Aluminum Copper Alloy

ALUMINUM 2011

Alloy Digest ◽  
1978 ◽  
Vol 27 (12) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Copper Alloy ◽  
Heat Treating ◽  
Temperature Performance ◽  
Screw Machine ◽  
Aluminum Copper Alloy

Abstract ALUMINUM 2011 is an age-hardenable aluminum-copper alloy to which lead and bismuth are added to make it a free-machining alloy. It has good mechanical properties and was designed primarily for the manufacture of screw-machine products. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Al-32. Producer or source: Various aluminum companies. Originally published October 1955, revised December 1978.

ZA-27

Alloy Digest ◽  
1977 ◽  
Vol 26 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Copper Alloy ◽  
High Strength ◽  
Heat Treating ◽  
General Purpose ◽  
Corrosion And Wear ◽  
Heavy Section ◽  
Thin Walled ◽  
Aluminum Copper Alloy ◽  
Lower Material

Abstract ZA-27 is a zinc-aluminum-copper alloy that offers exceptionally high strength (58,000 to 64,000 psi tensile strength as cast) at modest cost. It performs best in thin-walled castings (down to 0.10 inch) which means reduced weight and lower material costs when castings are redesigned. It is similar to the general-purpose ZA-12 alloy (Alloy Digest Zn-31, September 1977) except for its higher strength and elongation, but with higher casting temperatures and poor heavy-section castability. This datasheet provides information on composition, physical properties, hardness, tensile properties, and shear strength as well as fracture toughness and creep. It also includes information on corrosion and wear resistance as well as casting, forming, heat treating, machining, and surface treatment. Filing Code: Zn-32. Producer or source: Eastern Alloys Inc.. See also Alloy Digest Zn-50, June 1990.

Seeking the Good Fitting Procedure of PALS Polymer Spectra

2008 ◽  
Vol 607 ◽  
pp. 64-66
Author(s):  
Nicolas Laforest ◽  
Jérémie De Baerdemaeker ◽  
Corine Bas ◽  
Charles Dauwe
Keyword(s):  
Experimental Data ◽  
Low Temperature ◽  
Positron Annihilation ◽  
Physical Meaning ◽  
Lifetime Measurements ◽  
Positron Annihilation Lifetime ◽  
Fitting Procedure ◽  
Fitting Procedures ◽  
Blob Model

Positron annihilation lifetime measurements on polymethylmethacrylate (PMMA) at low temperature were performed. Different discrete fitting procedures have been used to analyze the experimental data. It shows that the extracted parameters depend strongly on the fitting procedure. The physical meaning of the results is discussed. The blob model seems to give the best annihilation parameters.

A Positron Annihilation Lifetime Study of Poly(Bisphenol-a Carbonate)

1986 ◽  
Vol 82 ◽  
Author(s):  
P. L. Jones ◽  
A. J. Hill ◽  
G. W. Pearsall ◽  
J. H. Lind
Keyword(s):  
Bisphenol A ◽  
Positron Annihilation ◽  
Thermal History ◽  
Thermal Response ◽  
Semicrystalline Polymers ◽  
Glass Transitions ◽  
Thermal Dependence ◽  
Positron Annihilation Lifetime ◽  
Ductile To Brittle Transition ◽  
Increasing Temperature

ABSTRACTPositron annihilation lifetime spectroscopy has proven to be sensitive to glass transitions and other free volume dependent phase transitions in amorphous and semicrystalline polymers. The thermal dependence of the lifetime spectra of positrons in compression-molded poly(bisphenol-A carbonate) has been measured from 253K to 323K, then modelled using a three component fit. The longest-lived component lifetime τ3 was found to vary linearly with increasing temperature independent of thermal history. The corresponding component intensity I3 was found to vary in a non-linear fashion with increasing temperature, exhibiting a significant dependence on thermal history. The observed thermal response of τ3 and I3 is discussed in terms of both molecular relaxation and the ductile-to-brittle transition behavior of poly(bisphenol-A carbonate).

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