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Effect of α+β phase rolling and aging treatment on laminated bimodal structure in high temperature titanium alloy
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Effect of α+β phase rolling and aging treatment on laminated bimodal structure in high temperature titanium alloy
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Effect of α+β phase rolling and aging treatment on laminated bimodal structure in high temperature titanium alloy
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Journal Article
Effect of α+β phase rolling and aging treatment on laminated bimodal structure in high temperature titanium alloy
2023
Overview
In this work, we have prepared a novel laminated bimodal structure with layer-by-layer distribution of α p and α s phase in high temperature titanium alloy by α+β phase rolling and aging treatment. The lamellar bimodal microstructure is comprised of long-primary α p and secondary α s phase in the Ti-6.0Al-3Sn-5Zr-0.5Mo-1.0Nb-1.0Ta-0.4Si-0.2Er alloy. During α+β phase rolling at 990 °C, the primary α p grain deformed to elongated layer structure, while the lamella secondary α s deformed to kinked and broken chaos morphology. After 800 °C for 1h stabilization and 700 °C for 5h aging treatment, the thickness of the elongated α p layer slightly grew, while the kinked and broken α s were recovered and partially recrystallized to form a layered fine grain structure. The lamellar bimodal microstructure, i.e., elongated primary α p with layered bimodal α s phase has enhanced strength and ductility of the high temperature titanium alloy. This enhanced strength and toughness is mainly attributed to the lamellae α p structure and layered fine α s grain formed by hot rolling and aging treatment.
Publisher
IOP Publishing
