Study of Steady State Creep and Lattice Parameters of Sn–1 wt% Zn Pewter near the Transition Temperature

Effect of Structural Transformation on the Creep Parameters of Sn-9.8 wt% In Alloy

“…The increase in _ e e values with the applied stress is due to the enhancement of the dissolution process of the Sn-phase by the effect of increasing applied stress [7]. In the low temperature range (below the transformation temperature 393 K), the strain rate sensitivity parameter m has values ranging from 0.156 to 0.165 which are in good agreement with the obtained values [9,11] which showed dislocation glide along the grain boundaries as operating mechanism. The m values in the high temperature range are found to be in the range of the proposed values for the dislocation climb mechanism [10].…”

“…2) as obtained by [3,4,9]. This means that the mentioned alloy contains a high density of lattice defects and dislocations.…”

Creep Characteristics of a New Pb-Free Soldering Sn-In Pewter

“…This relation is determined using a least-squares fitting computer program, resulting in Q 0 ¼ 79.7 kJ/mol and V ¼ 3.25 Â 10 --3 m 3 /mol with a strong negative correlation coefficient of --0.99. The errors of Q 0 are evaluated by [9] dQ 0 ¼ ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi…”

“…If the dislocations were thermally activated to glide during this process, considerable aggregates are formed at grain boundaries through the agency of only few dislocations. The free energy of the aggregation is considered to be the driving force for dislocation glide [21] under these circumstances and assumed the apparent value 79.7 AE 2.1 kJ/mol, which corresponds to the total obstacle strength [9]. The fact that the transformed g-InSn4 phase at 100 C [8] occurs with such complete homogeneity rules out the possibility of dislocation-aided formation of In aggregates, whether it is by diffusion along a dislocation pipe or on the tension or compression sides of edge dislocations.…”

“…They are widely used for utensils and have to some extent replaced the traditional silverware which was formerly part of the domestic scene. The creep behaviour around the transformation temperature of an important pewter has been investigated [9,10]. The strain-rate sensitivity parameter and the activation energy were used in defining the operating mechanisms.…”