Abstract
The temper hardening of quench-induced Cu-Al martensite was investigated via trans-mission electron microscopy, differential thermal analysis, microhardness and yield strength measurements. The results obtained are also viewed in conjunction with inde-pendent set of experimental data dealing with anneal hardening of the α-phase without prior martensitic transformation. A substantial low temperature hardening of a 10 pct Al martensite is indicated and attributed to the formation of small ordered clusters, en-hanced by stacking faults already existing in martensite. In the 11 pct Al martensite hardening is also linked with ordering though less pronounced due to the larger domain size reached. On the other hand the tempering of 11.8 pct Al martensite is associated with phase separation leading to the(α + γ2) state via continuous and discontinuous pre-cipitation.
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