Plastic deformation of Mg-Mn alloy single crystals

✍ Scribed by J.G Byrne

• Publisher: Elsevier Science
• Year: 1963
• Weight: 584 KB
• Volume: 11
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(63)90189-5

✦ Synopsis

Strengthening in the early aged state is attributed to a shear of thin a-Mn precipititte particles by dislocations which produces chemical hardening and generates new faulted interfaces inside the manganese particles. Activation energies and volumes have been calculated for this process from the dependence of the flow stress on temperature and strain rate. The temperature dependence of the flow stress as s, function of strain shows that the dislocation friction stress due to precipitates is small. The solid solution strength is attributed to clustering. A number of analogies are made with the case of hardening due to GP-I zones in Al-& alloys. Geometrical softening yield points, previously found at 300"K, are suppressed at 77°K by the increased rate of work hardening at the lower temperature.

DEFOR~~.~TIO~ ~LASTIQUE DE ~~O~OCRISTAUX Mg-Mn

Le durcissement au premier stade du vieillissement est &rib& iL un oisaillement des fines partioules precipit~oCs de Mn G( par des dislocations, ee qui produit nn durcissement chimique et engendre de nouveaux interfaces avee defauts & l'interieur des pmticules de manganese. Les energies et les volumes d'aetivation ont 6te calculirs pour oe processus it partir de