Shape memory alloys (SMA). Vocabulary and measures.

1 OBJET ET DOMAINE D'APPLICATION 3

2 RÉFÉRENCE 3

3 DÉFINITIONS 4

3.1 Alliages à mémoire de forme (AMF) 4

3.2 Transformation martensitique 5

3.2.1 Phase austénitique ou phase-mère ou austénite 5

3.2.2 Phase martensitique ou martensite 5

3.3 Cycle de transformation martensitique 5

3.3.1 Températures caractéristiques 6

3.3.2 Paramètres caractéristiques du cycle 7

3.4 Propriétés des AMF et vocabulaire associé 7

3.4.1 Effet mémoire simple sens (EMSS) 7

3.4.2 Effet superélastique 9

3.4.3 Effet caoutchoutique 10

3.4.4 Effet mémoire double sens assisté (EMDSA) (superthermoélasticité) 11

3.4.5 Effet mémoire double sens (EMDS) 12

4 MESURES 12

4.1 Définition des caractéristiques pratiques des cycles de transformation 13

4.2 Détermination expérimentale des cycles de transformation 13

4.2.1 Enthalpie de transformation 14

4.2.2 Résistivité électrique 16

4.2.3 Pouvoir thermoélectrique (PTE) 17

4.2.4 Émission acoustique (EN 17

4.3 Caractérisation expérimentale des propriétés thermomécaniques 17

4.3.1 Mesure des effets superélastique et caoutchoutique 18

4.3.2 Mesure de l'effet mémoire simple sens, double sens assisté et double sens 20

4.3.3 Mesure de capacité d'amortissement mécanique des AMF 22

ANNEXE A - Liste des abréviations et symboles employés dans le corps de la norme 23

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