EFFECT OF COEXISTENCE OF SIMILAR ELEMENTS La AND Ce ON FORMATION OF (La-Ce)-Al-Cu BULK METALLIC GLASSES

EFFECT OF COEXISTENCE OF SIMILAR ELEMENTS La AND Ce ON FORMATION OF (La-Ce)-Al-Cu BULK METALLIC GLASSES
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相似元素La和Ce共存对(La-Ce)-Al-Cu块体金属玻璃形成的影响

DOI:
10.1142/s0217979209060749
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发表时间:
2009-03
影响因子:
1.7
通讯作者:
Yang, Qing
Yang, Qing
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Li, Ran;Pang, Shujie;Zhang, Tao;Yang, Qing

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利用La和Ce元素共存、原子尺寸相近、价电子结构不同对非晶形成能力的有利影响,合成了具有高非晶形成能力的(La-Ce)-Al-Cu赝三元系大块金属玻璃。(LaxCe 1-x)65 Al 10 Cu 25系统中La和Ce共存,可以通过铜模铸造制备直径达12 mm的大块金属玻璃。(LaxCe_(1-x))_(65)Al_(10)Cu_(25)BMG(x = 0.6和0.7)除了具有较高的玻璃体积分数外,还具有较低的玻璃化转变温度Tg(约362 K)和较宽的过冷液相区ΔTx(ΔTx = Tx - Tg,Tx为晶化起始温度)(约80 K)。与三元La-Al-Cu和Ce-Al-Cu体系相比,(La-Ce)-Al-Cu体系的非晶区面积显著提高是由于La和Ce的相似元素共存所致,并从热力学角度讨论了其机理。
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 (LaxCe1-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 ΔTx (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.
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