M.S. (Master of Science)
Department of Mechanical Engineering
Recent focus in the manufacturing industry has been on micro-forming processes due to the ability to miniaturize components whilst maintaining strength. In this study, the effect of temperature on the formability of 38microm thick commercially pure titanium foil (CP-Ti) is determined. Titanium possess low ductility due to its hexagonal close-packed (HCP) crystalline structure and limited slipping systems. In Northern Illinois University's engineering materials lab, a series of micro limiting dome height (microLDH) tests were performed inside a MTS environmental heat chamber at temperatures of 100℗ʻC, 200℗ʻC and 300℗ʻC. The diameter of the punch used is 2mm and the sample sizes are 2mm, 3mm and 4mm. Analyzing the fractures using ImageJ software enabled the construction of a forming limit diagram (FLD) at each temperature. From this, a forming limit curve (FLC) was generated using the ASTM E2218-02 standard (2008) for each FLD. Comparing the FLC's low points and plane strain values reveals how the formability of CP-Ti increases as temperature increases.
Nunnally, Alexander, "The effect of temperature on the formability of commercial pure titanium foil" (2017). Graduate Research Theses & Dissertations. 5568.
Northern Illinois University
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