Medium-range structure and glass forming ability in Zr–Cu–Al bulk metallic glasses

Structural origin of the high glass-forming ability (GFA) in multicomponent bulk metallic glasses (BMGs) caused by minor alloying was investigated using state-of-the-art synchrotron radiation techniques. It is found that a two-shell icosahedral cluster with one Y center is the basic structural unit in the representative Cu46Zr42Al7Y5 BMG, which may be densely packed with the help of shared and glue atoms, leading to enhanced ordering at short and medium range. This cluster dense packing may play a key role in achieving the high GFA in CuZrAlY alloy, which also explains the strong dependence of GFA on Y content observed in many experiments. The present work may be extended to a series of multicomponent amorphous alloys, the formation of which is strongly dependent on minor alloying.

Download Full-text

The outstanding effect and mechanism of non-inert casting atmospheres on glass forming ability of P-containing Fe-based soft magnetic bulk metallic glasses

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.158991 ◽

2021 ◽

Vol 866 ◽

pp. 158991

Author(s):

Jianhua Zhang ◽

Chengzhong Zhang ◽

Xiaoxiong Zhang ◽

Zhien Li ◽

Aina He ◽

...

Keyword(s):

Metallic Glasses ◽

Bulk Metallic Glasses ◽

Glass Forming Ability ◽

Soft Magnetic ◽

Glass Forming

Download Full-text

Effects of Al replacement on glass forming ability and mechanical properties of Zr-based bulk metallic glasses

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2021.120962 ◽

2021 ◽

Vol 568 ◽

pp. 120962

Author(s):

Y. Tan ◽

Y.W. Wang ◽

X.W. Cheng ◽

Q. Fu ◽

Z.H. Xin ◽

...

Keyword(s):

Mechanical Properties ◽

Metallic Glasses ◽

Bulk Metallic Glasses ◽

Glass Forming Ability ◽

Glass Forming

Download Full-text

On Glass Forming Ability of Bulk Metallic Glasses by Relating the Internal Friction Peak Value

Metals ◽

10.3390/met10060767 ◽

2020 ◽

Vol 10 (6) ◽

pp. 767

Author(s):

Xianfeng Zhang ◽

Xiao Cui ◽

Zhuotong Du ◽

Fangqiu Zu ◽

Jinjing Li ◽

...

Keyword(s):

Internal Friction ◽

Metallic Glasses ◽

Bulk Metallic Glasses ◽

Glass Forming Ability ◽

Liquid Region ◽

Internal Friction Peak ◽

Glass Forming ◽

Constituent Elements ◽

Valid Criterion ◽

Peak Value

The internal friction (IF) behaviors of a series of LaCe-, Zr-, and La-based bulk metallic glasses (BMGs) were studied by a computer-controlled, conventional inverted torsion pendulum. The results indicate that with an increasing temperature, the IF also increases gradually in the supercooled liquid region, followed by a decrease caused by crystallization. BMGs with a good glass forming ability (GFA) usually possess a high IF peak value for an alloy system with the same constituent elements. Furthermore, the magnitude of the IF value (Qi−1) of the inflection point is an efficient criterion of GFA. The Qi−1 value is a valid criterion under the conditions of identical constituent elements and different element contents. However, Qi−1 and GFA have no relationship among different alloy systems.

Download Full-text