| Title |
Mechanical properties of Hot - Pressed Metastable Ti50Al50 Powders Prepared by Mechanical Alloying |
| Authors |
안중호(Jung Ho Ahn); 최철진(Chul Jin Choi); 정형식(Hyun Sik Chung) |
| Abstract |
Elemental Ti＋Al powder mixtures ((Ti_(50)Al_(50)) have been mechanically alloyed (MA) to obtain amorphous and/or nanocrystalline powders using a conventional horizontal ball milling. The MA metastable powders were then vacuum hot pressed(VHP) at 1000℃ for 1 hour, followed by an annealing at 1200℃ for 8 hours. Very fine microstructures were retained after the hot pressing and the subsequent annealing, less than 1㎛ in grain size. The result obtained by a compression testing on the annealed specimens shows a good combination of fracture strength and ductility as compared to cast specimen. Very fine grain structure might be the major cause of the property improvement. |