Abstract
This study investigates the effect of strain rates and temperatures on the mechanical behavior of ultrasonically consolidated Titanium–Aluminum thin foils to understand and characterize their formability. To this goal, laminated composite samples with a distinct number of layers were bonded using ultrasonic consolidation. Then, tensile and biaxial hydraulic bulge tests at different strain rates and temperature conditions were conducted. The effect of the sample orientation on the mechanical response was also examined. Tensile and hydraulic bulge tests results were compared to observe differences in ultimate tensile strength and strain levels under uniaxial and biaxial loading conditions. The effects of loading condition, strain rate, and temperature on the material response were analyzed and discussed on the basis of test results. In general, it was concluded that the maximum elongation values attained were higher for the samples subtracted along the sonotrode movement direction compared to those obtained from the normal to sonotrode movement direction. The elongation was obtained as high as 46% for seven bi-layered samples at high-temperature ranges of 200–300 °C. Hydraulic bulge test results showed that elongation improved as the number of bi-layers increased, yet the ultimate strength values did not change significantly indicating an expansion of the formability window.
Highlights
In recent years, laminated metal composites (LMCs) that combine the superior features of different metals have gained considerable attention as they improves properties such as high strength, stiffness, and toughness [1,2,3,4,5]
The titanium–titanium tri-aluminide (Ti-Al3Ti) composite system is a great candidate for structural applications due to the combination of high strength, stiffness, and toughness at a lower density of monolithic titanium
Figure shows three bi-layered tensile samples that were tested at a strain rate of 0.0013/s, and at room temperature
Summary
In recent years, laminated metal composites (LMCs) that combine the superior features of different metals have gained considerable attention as they improves properties such as high strength, stiffness, and toughness [1,2,3,4,5]. The titanium–titanium tri-aluminide (Ti-Al3Ti) composite system is a great candidate for structural applications due to the combination of high strength, stiffness, and toughness at a lower density of monolithic titanium. The Ti-Al3Ti system is more economical than monolithic titanium because Al is relatively inexpensive compared to Ti [6]. Lightweight Ti-Al LMCs have been increasingly exploited in various applications including defense, aerospace, and automotive [6]. LMCs that consist of commercial pure Ti (CP-1) and pure. Al (AA1100) layers have been used in armor applications such as in mine blast mitigation as well as in civil aviation [7].
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