EFFECT OF COEXISTENCE OF SIMILAR ELEMENTS La AND Ce ON FORMATION OF (La-Ce)-Al-Cu BULK METALLIC GLASSES
(0) Bulk metallic glasses (BMGs) in pseudo-ternary (La-Ce)-Al-Cu system with high glass-forming ability (GFA) were synthesized based on the beneficial effect of the coexistence of similar elements La and Ce with similar atomic size and various valence electronic structures on GFA. With the coexistence of La and Ce in (La_xCe1-x)65Al10Cu25 system, bulk metallic glasses with diameters up to 12 mm can be produced by copper mold casting. Besides the high GFA, the (LaxCe1-x)65Al10Cu25 BMGs with x = 0.6 and 0.7 exhibit low glass transition temperature Tg around 362 K and wide supercooled liquid regions ΔT, (ΔTx = Tx - Tg, where Tx is the onset temperature of crystallization) of about 80 K. Compared with ternary La-Al-Cu and Ce-Al-Cu systems, significant improvement of GFA for the (La-Ce)-Al-Cu system is caused by the coexistence of similar elements La and Ce, and the mechanism is discussed from a thermodynamic viewpoint.
Rare earth metal bulk metallic glass glass forming ability supercooled liquid region
QING YANG SHUJIE PANG RAN LI TAO ZHANG
Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
1235-1240
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）