کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
832960 | 908128 | 2009 | 6 صفحه PDF | دانلود رایگان |
Al67Ti25Cr8 powders with cubic L12 ordered structural characteristic are formed by mechanical alloying and annealing process. X% Al–Al67Ti25Cr8 composites (X = 5, 10, 15, 20 wt.%) were fabricated by hot isostatic pressing. Porosity of bulk specimen, first decreases, and then increases with increasing Al content at same test conditions. The 10 wt.% Al–Al67Ti25Cr8 composite exhibited good compactibility, whilst the 20 wt.% Al–Al67Ti25Cr8 composite exhibited honeycomb-shaped structures due to the expanding and shrinkage of Al. Owing to Al additions jamming the micro-pores and micro-cracks, Al–Al67Ti25Cr8 composites with suitable Al contents (10–15 wt.%) exhibit improved strength (0.2%YS as 420 MPa and UTS as 469 MPa) and fracture toughness (10.4 MPa m0.5). However, too high Al additions caused the deterioration of mechanical properties.
Journal: Materials & Design - Volume 30, Issue 3, March 2009, Pages 704–709