An “in situ” study of study of quenched Ti-Al system samples during heating

Sergey Demakov,Irina Kirillova,Iana Semkina

doi:10.1088/1757-899x/613/1/012007

Sergey Demakov, Irina Kirillova + Show 1 more

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https://doi.org/10.1088/1757-899x/613/1/012007

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Abstract

The study of the Ti-Al system samples containing up to 10 wt.% Al water quenched from different temperatures in β-phase region, was carried out in situ during heating on X-ray diffractometer. XRD analysis of quenched samples showed the presence of α’-martensite only. After quenching the increase of Al content in alloys displayed the decrease of the lattice parameters «a» and «c» and the rise of «c/a» ratio, since the lattice parameter «c» dropped slightly in contrast with the lattice parameter «a». Furthermore, Thermo-XRD (T-XRD) analysis represented the anisotropy of the coefficient of thermal expansion (CTE). Besides, T-XRD analysis indicated, that «c/a» ratio of samples Ti-0.5 wt.% Al with the least amount of Al revealed the fall of «c/a» ratio and at the same time samples contained 7 and 8 wt.% Al remained practically the same during heating. Whereas, samples Ti-10 wt.% Al with the largest quantity of Al showed the rise of c/a ratio during heating.

Highlights

The objective of this work was the study of the «с/а» parameter changes during the heating compared with room temperature values
The study of the Ti-Al system samples containing up to 10 wt.% Al water quenched from different temperatures in β-phase region, was carried out in situ during heating on X-ray diffractometer
After quenching the increase of Al content in alloys displayed the decrease of the lattice parameters «a» and «c» and the rise of «c/a» ratio, since the lattice parameter «c» dropped slightly in contrast with the lattice parameter «a»

Summary

Introduction

The objective of this work was the study of the «с/а» parameter changes during the heating compared with room temperature values. Regularities of parameters «с/a» change allow more accurately determine the HCP lattice deformation behavior of α-, pseudo-α- and (α+β)-titanium alloys of different composition with changing deformation temperature, since it directly depends on the alloy composition and, on the parameter «с/а» [1, 2]. 2. Experiment and Research Methodology The research material were samples of plates with a thickness of 3 mm made of titanium alloys with different aluminum content. The specimens were water quenched and annealed at 300 o (1 hour). The charge and obtained compositions of the studied alloys are shown in table 1

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