Dislocation pinning in Al and Ag alloys after low-temperature deformation

Abstract

Elastic modulus and resistivity isochronal annealing measurements in dilute Al and Ag alloys are made after deformation at 77 K. The resistivity annealing stages are situated around 90 and 230 K in Al alloys and around 110 and 240 K in Ag alloys. An increase of the elastic modulus is induced by dislocation pinning. In Al alloys, a large pinning stage is observed around 180 K. In AlSn, AlIn, and AlGe, a pinning stage is also observed around 230 K. The dislocation pinning is discussed.

On the Effect of Hydrogen on the Low-Temperature Elastic and Anelastic Properties of Ni-Ti-Based Alloys

“…The Young’s modulus data for the heat-treated sample show that the low-temperature IF maximum is not of a relaxational nature: the minimum of the absolute values of temperature coefficient in the vicinity of the IF maximum is contrary to what is characteristic of relaxation. Such behaviour of the effective elastic modulus on heating is usually ascribed to a pinning (annealing, recovery) stage (see, for example, References [ 28 , 29 , 30 ]). The pinning of twin boundaries by mobile point defects is revealed clearly from data on the strain amplitude dependence of the IF ( Figure 5 , Figure 6 and Figure 7 ).…”

Effect of Hydrogen on the Elastic and Anelastic Properties of the R Phase in Ti50Ni46.1Fe3.9 Alloy

“…The high-temperature side of this maximum corresponds to stages in the E (T) dependence with decreasing absolute values of the temperature coefficient (Figure 3). Such behaviour of the effective elastic modulus on heating is conventionally ascribed to a pinning (annealing, recovery) stage (see, for example, [25][26][27]). Dehydrogenation treatment suppresses strongly the pinning stage provoking the increase of δ i and transformation of the well-defined low-temperature δ i (T) maximum into a plateau (or very smooth maximum at higher temperatures of 150-160 K).…”