TY  - JOUR
T1  - Effect of Time Fixing Aluminum (In its Solid State Phase): On Recovery
Rate of a Memory Alloy (Cu, Al, Ni)
AU - Alkhafaji, Ahmed Abdulrasool Ahmed 
JO  - Journal of Engineering and Applied Sciences
VL  - 14
IS  - 2
SP  - 516
EP  - 525
PY  - 2019
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2019.516.525
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2019.516.525
KW  - (Cu-Al-Ni) smart alloys
KW  -powder metallurgy
KW  -strain recovery
KW  -XRD
KW  -SEM
KW  -martensite
KW  -method
AB  - Shape memory alloys (Cu+Al+Ni) can be applied in many scientific fields, the alloy is manufactured
by Powder Metallurgy (P/M) method. The sintering stage is performed in two stages. The 1st stage is to
stabilize the solid phase of the aluminum, this is done by keeping the temperature at the 1st stage at 500°C for
1 h. This is performed, so, as to ensure that the aluminum does not change to a molten state when passing
through the 2nd sintering stage at which the alloy is heat treated at 850°C. This research studied the effect of
the heat treatment time on shape recovery. The alloy used was [83% Cu-13% Al-4% Ni]. Three different time
periods were used for the 1st stage of the heat treatment and they were (0.5, 1.0, 1.5 h) the recovery was
treatment time of (1.0 h) then 0.5 h and lastly 1.5 h. Physical tests were also performed to ensure that both
martensite and austenite were present. The recovery rates were 80, 25 and 10% , respectively, for the three times
to stay samples. This study shows the importance of the amount of time spent on the 1st stage of the sintering
process for this type of alloy for the recovery percentage.
ER  -