Anomalous thermal expansion in the deep super-cooled liquid region of a ZrCuAlAg bulk metallic glass

被引：10

作者：

Hu, Q. ^{[1
,2
]}

Wang, J. M. ^{[1
,2
]}

Yan, Y. H. ^{[1
,2
]}

Luo, F. F. ^{[3
]}

Guo, S. ^{[4
]}

Liu, J. ^{[3
]}

Chen, S. S. ^{[1
,2
]}

Huang, B. ^{[5
]}

Lu, D. P. ^{[3
]}

Zou, J. Z. ^{[1
,2
]}

Zeng, X. R. ^{[1
,2
]}

机构：

[1] Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Special Funct Mat, Shenzhen, Peoples R China

[2] Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen, Peoples R China

[3] Jiangxi Acad Sci, Inst Appl Phys, Nanchang, Jiangxi, Peoples R China

[4] Chalmers Univ Technol, Dept Ind & Mat Sci, Gothenburg, Sweden

[5] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian, Shaanxi, Peoples R China

来源：

MATERIALS RESEARCH LETTERS | 2018年 / 6卷 / 02期

基金：

中国博士后科学基金;

关键词：

Bulk metallic glasses; super-cooled liquid; viscous flow; nano-crystals; grain boundary; SUPERCOOLED LIQUID; GRAIN-BOUNDARIES; AMORPHOUS PHASE; CRYSTALLIZATION; FORMABILITY; TRANSITION; KINETICS;

D O I：

10.1080/21663831.2017.1408713

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bulk metallic glasses (BMGs), like other glasses, soften in the super-cooled liquid region (SCLR). Here in this work, surprisingly, a large expansion is reported occurring in the deep SCLR of a Zr47Cu37Al8Ag8 BMG. Nano-crystals (NCs) are found precipitated during the anomalous expansion of Zr47Cu37Al8Ag8, but also in the SCLR of Zr43Cu41Al8Ag8 that exhibits a conventional softening. It is found that there is a steep composition and density change at the NCs/amorphous matrix transition region in the former alloy, and this transition region exerts a thermal stress of about 0.15 MPa to the surrounding super-cooled liquid (SCL) and drives the soft SCL to expand severely. [GRAPHICS] .

引用

页码：121 / 129

页数：9

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