About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Development of Light Weight Alloys and Composites
|
Presentation Title |
Development of a High-temperature High Strength Aluminum Alloys by Microstructure Tuning |
Author(s) |
Kamanio Chattopadhyay, Ujjval Bansal, Mahander Pratap Singh, Shyam Kanta Sinha, Sukla Mondol, Surendra Kumar Makineni |
On-Site Speaker (Planned) |
Kamanio Chattopadhyay |
Abstract Scope |
One of the current challenges in light alloys is to develop aluminum alloys that can withstand up to 250 °C. The present talk summarizes our recent experiments on Al-Cu alloys with micro-addition of Si, Zr, Ta, Nb, or Hf promoting high-temperature stable ordered L12 precipitates that heterogeneously nucleate copper-rich θ”/θ’ plates and also partitions into them. Si or Nb suppresses the discontinuous precipitation of L12 precipitates and accelerates their kinetics. The resultant microstructure shows higher coarsening resistance and stability at high temperatures. Some of the alloys show 0.2% yield strength > 250 MPa at 250 °C. Atomic-scale compositional and structural analysis by atom probe tomography (APT) and aberration-corrected transmission electron microscopy (TEM) were used to reveal the mechanisms related to high-temperature behavior of these alloys. |