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The microstructure evolution in the isothermal compression of Ti-17 alloy.

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Title: The microstructure evolution in the isothermal compression of Ti-17 alloy.
Authors: Mu, Z.1,2, Li, H.1, Li, M.Q.1 honeymli@nwpu.edu.cn
Source: Materials Science & Engineering: A. Oct2013, Vol. 582, p108-116. 9p.
Subjects: Titanium alloys, Microstructure, Compression loads, Mechanical properties of metals, Parameter estimation, Temperature effect
Abstract: Abstract: The effects of processing parameters on flow curves and microstructure evolution in the isothermal compression of Ti-17 alloy are investigated. The experiments are conducted in a deformation temperature range of 800–920°C, strain rate range of 0.01–10.0s−1 and height reduction range of 30–70%. The flow stress increases with a decrease in deformation temperature or an increase in strain rate. Based on the optical microstructure observations, both of deformation temperature and strain rate have a great effect on the volume fraction of α grains. The effect of strain rate on primary α grains morphology and softening mechanism is of first-order importance compared with the effects of deformation temperature and strain. Transmission electron microscope (TEM) analysis is carried out at a deformation temperature of 840°C, strain rate of 0.1s−1 and 10.0s−1 to reveal the two mechanisms for the morphology evolution of primary α grains. When the strain rate is relatively low, the primary α grains are globularized after the penetration of β phase along α/α subboundaries. While the strain rate is relatively high, the primary α grains are elongated, and the dislocation density in grain interior is relatively high. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: The effects of processing parameters on flow curves and microstructure evolution in the isothermal compression of Ti-17 alloy are investigated. The experiments are conducted in a deformation temperature range of 800–920°C, strain rate range of 0.01–10.0s−1 and height reduction range of 30–70%. The flow stress increases with a decrease in deformation temperature or an increase in strain rate. Based on the optical microstructure observations, both of deformation temperature and strain rate have a great effect on the volume fraction of α grains. The effect of strain rate on primary α grains morphology and softening mechanism is of first-order importance compared with the effects of deformation temperature and strain. Transmission electron microscope (TEM) analysis is carried out at a deformation temperature of 840°C, strain rate of 0.1s−1 and 10.0s−1 to reveal the two mechanisms for the morphology evolution of primary α grains. When the strain rate is relatively low, the primary α grains are globularized after the penetration of β phase along α/α subboundaries. While the strain rate is relatively high, the primary α grains are elongated, and the dislocation density in grain interior is relatively high. [Copyright &y& Elsevier]
ISSN:09215093
DOI:10.1016/j.msea.2013.06.043