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The mechanism of anneal-hardening phenomenon in extruded Zn–Al alloys
Highlights ► We explored the conditions for anneal-hardening effect in extruded Zn–Al alloys. ► We investigated the microstructure evolution during the annealing process. ► The phase decomposition of suspensive Zn-rich α2 phase was observed. ► The hardness increases with the decreasing volume fraction of α2 phase. ► High plasticity and high hardness can be obtained by proper heat treatments.
Abstract An anomalous anneal-hardening phenomenon was studied in extruded Zn–Al alloys. The extruded Zn–Al alloys were isothermally heated above the eutectoid point for 10h, and then cooled with furnace. The anneal-hardening phenomenon was observed in specimens with aluminum content ranging from 5wt% to 25wt%. Microstructure evolution during the annealing process was investigated. The annealing–hardening phenomenon was accompanied by phase transformation from a suspensive Zn-rich α2 phase to an equilibrium Al-rich α1 phase and a Zn-rich η phase. The hardness of the alloys increased with the decreasing volume fraction of the α2 phase. The hardness of the α1 phase and the η phase was measured and the hardness of the α2 phase was calculated. The mechanism of the anneal-hardening phenomenon in extruded Zn–Al alloys can be attributed to phase transformation from the soft α2 phase to the harder α1 +η phases.
The mechanism of anneal-hardening phenomenon in extruded Zn–Al alloys
Highlights ► We explored the conditions for anneal-hardening effect in extruded Zn–Al alloys. ► We investigated the microstructure evolution during the annealing process. ► The phase decomposition of suspensive Zn-rich α2 phase was observed. ► The hardness increases with the decreasing volume fraction of α2 phase. ► High plasticity and high hardness can be obtained by proper heat treatments.
Abstract An anomalous anneal-hardening phenomenon was studied in extruded Zn–Al alloys. The extruded Zn–Al alloys were isothermally heated above the eutectoid point for 10h, and then cooled with furnace. The anneal-hardening phenomenon was observed in specimens with aluminum content ranging from 5wt% to 25wt%. Microstructure evolution during the annealing process was investigated. The annealing–hardening phenomenon was accompanied by phase transformation from a suspensive Zn-rich α2 phase to an equilibrium Al-rich α1 phase and a Zn-rich η phase. The hardness of the alloys increased with the decreasing volume fraction of the α2 phase. The hardness of the α1 phase and the η phase was measured and the hardness of the α2 phase was calculated. The mechanism of the anneal-hardening phenomenon in extruded Zn–Al alloys can be attributed to phase transformation from the soft α2 phase to the harder α1 +η phases.
The mechanism of anneal-hardening phenomenon in extruded Zn–Al alloys
Zhang, Yangming (author) / Yang, Lijing (author) / Zeng, Xuduo (author) / Zheng, Bizhang (author) / Song, Zhenlun (author)
2013-02-24
7 pages
Article (Journal)
Electronic Resource
English
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