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Produzione e studio delle proprietà delle leghe a memoria di forma Cu-Al-Ni
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ISBN10: 6208544092
ISBN13: 9786208544096
Publisher: Edizioni Sapienza
Published: Jan 14 2025
Pages: 100
Weight: 0.35
Height: 0.24 Width: 6.00 Depth: 9.00
Language: Italian
ISBN13: 9786208544096
Publisher: Edizioni Sapienza
Published: Jan 14 2025
Pages: 100
Weight: 0.35
Height: 0.24 Width: 6.00 Depth: 9.00
Language: Italian
In questo libro, le leghe a memoria di forma di Cu Al Ni sono state preparate utilizzando la tecnica della metallurgia delle polveri con il 13% in peso di Al e il 4% in peso di nichel, che è la lega principale, con diversi elementi di lega come Cr, Nb e Ta in aggiunta (0,3, 0,6 e 0,9% in peso). Dopo la miscelazione delle polveri, sono stati preparati campioni a disco con diametro di 14 mm e spessore di 5 mm e campioni cilindrici con diametro di 11 mm e lunghezza di 16,5 mm a 650 MPa come stress di compattazione adeguato in base ai risultati di porosità e densità apparente. La sinterizzazione in forno a tubi sottovuoto per tutti i campioni preparati è stata ottenuta utilizzando due fasi di sinterizzazione a 500 C per un'ora e la seconda a 850 C per cinque ore. Dopo la sinterizzazione sono stati eseguiti test fisici e meccanici che hanno riguardato la densità apparente e la porosità , la diffrazione dei raggi X e la durezza, la resistenza alla compressione, l'usura da scorrimento a secco e l'effetto forma. Le caratteristiche della microstruttura sono state osservate anche al microscopio ottico e al microscopio elettronico a scansione con spettrometria a raggi X a dispersione di energia (EDX). Infine, il calorimetro a scansione differenziale (DSC) è stato utilizzato per determinare la temperatura di trasformazione di fase per tutte le leghe additivate.
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