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Effect of aging temperature on microstructure and properties of Ti-6Al-4V alloy

Aiping Li

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Abstract

Solution treatment at 520 ℃ for 1.5 h and water quenching were applied to Ti-6Al-4V alloy,and followed by artificial aging at 480～540 ℃ for 8 h.The effects of aging temperature on microstructure and mechanical properties of the alloy were investigated by means of SEM,optical microscope,double shearing test and tensile test.The results show that at the aging temperature of 520 ℃,the microstructure of the alloy is characterized by clear grain boundary and lamellar structure,and its tensile strength and shear strength both reach the maximum values.The fractograph of the tensile specimen aged at 520 ℃ presents a typical ductile fracture with oval and deep dimples.It can be shown that the excellent comprehensive properties of Ti-6Al-4V alloy can be obtained by controlling the grain size of primary α phase and the shape and amount of the secondary α phase at optimized aging temperature.

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What this paper is about

Solution treatment at 520 ℃ for 1.5 h and water quenching were applied to Ti-6Al-4V alloy,and followed by artificial aging at 480～540 ℃ for 8 h.The effects of aging temperature on microstructure and mechanical properties of the alloy were investigated by means of SEM,optical microscope,double shearing test and tensile test.The results show that at the aging temperature of 520 ℃,the microstructure of the alloy is characterized by clear grain boundary and lamellar structure,and its tensile strength and shear strength both reach the maximum values.The fractograph of the tensile specimen aged at 520 ℃ presents a typical ductile fracture with oval and deep dimples.It can be shown that the excellent comprehensive properties of Ti-6Al-4V alloy can be obtained by controlling the grain size of primary α phase and the shape and amount of the secondary α phase at optimized aging temperature.

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Available abstract

Solution treatment at 520 ℃ for 1.5 h and water quenching were applied to Ti-6Al-4V alloy,and followed by artificial aging at 480～540 ℃ for 8 h.The effects of aging temperature on microstructure and mechanical properties of the alloy were investigated by means of SEM,optical microscope,double shearing test and tensile test.The results show that at the aging temperature of 520 ℃,the microstructure of the alloy is characterized by clear grain boundary and lamellar structure,and its tensile strength and shear strength both reach the maximum values.The fractograph of the tensile specimen aged at 520 ℃ presents a typical ductile fracture with oval and deep dimples.It can be shown that the excellent comprehensive properties of Ti-6Al-4V alloy can be obtained by controlling the grain size of primary α phase and the shape and amount of the secondary α phase at optimized aging temperature.

Key concepts: Materials science, Microstructure, Alloy, Ultimate tensile strength, Lamellar structure, Optical microscope, Metallurgy, Quenching (fluorescence)

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