About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Mechanical Behavior and Failure Mechanisms of Ti-Al4%Mg Metal Laminates (MLs) and Reacted Metal-Intermetallic Laminates (MILs) at Micro and Nanometer Layer Thicknesses |
| Author(s) |
Daniel Yin, Rodney Mccabe, Thomas Nizolek |
| On-Site Speaker (Planned) |
Daniel Yin |
| Abstract Scope |
Micro and nano metal-laminates (MLs) can attain high specific strength due to the high area density of interfaces. The strength of MLs with intermetallic forming constituents may be further improved by annealing to produce metal-intermetallic-laminates (MILs). In this work, Ti-Al4%Mg MLs are fabricated using accumulated-roll-bonding to layer thicknesses as low as 25nm and then annealed to form MILs. Micromechanical testing is used to reveal the effects of layer thickness and intermetallic phase fraction on both strength and ductility. While strengths as high as ~3GPa are achieved by forming a Ti-TiAl_3 MIL with 50nm layer thickness, the high volume fraction of intermetallic leads to low ductility. Non-monotonic changes in strength and ductility as a function of annealing are observed in composites with micron-scale layers due to the combined effects of recrystallization of the metal phases and intermetallic phase growth. These results offer guidance for tailoring the mechanical properties of MIL composites. |