ABSTRACT
The character of the tensile properties change as a result of the combined action of
cold plastic deformation and ageing is illustrated by the data presented in Figure 94 [239,
299]. The tensile tests were carried out at room temperature using samples of the alloy
M g - 3 mass % N d . The alloy was hot extruded into round rods and then solution treated by
quenching from temperature 535°C in cold water. In this condition the alloy structure
consisted of only M g solid solution. One part of the samples was deformed by 5%
stretching. Deformed and nondeformed samples were aged simultaneously at various
temperatures for the same time of 24 h. A s one can see from Figure 94, dependence of
tensile stress (TS), tensile yield stress for 0.2% offset ( T Y S ) and elongation (E) on the
ageing temperature are similar for deformed and nondeformed samples. The strength
characteristics change with increasing ageing temperature passing through a maximum,
and elongation changes with increasing ageing temperature passing through a minimum.
