Lanthanum-Cerium Based Bulk Metallic Glasses with Superior Glass-Forming Ability

TL;DR

This paper reports a new lanthanum-cerium based bulk metallic glass with exceptional glass-forming ability, capable of forming large fully glassy rods, by leveraging complex crystallization frustration through alloy composition.

Contribution

It introduces a novel quinary alloy with superior GFA, demonstrating how coexisting elements hinder crystallization to produce larger glassy samples.

Findings

Achieved 32 mm diameter fully glassy rods.

Compared GFA with similar alloys to identify key factors.

Coexistence of La-Ce and Co-Cu enhances glass formation.

Abstract

A quinary (La0.5Ce0.5)65Al10(Co0.6Cu0.4)25 alloy with superior glass-forming ability (GFA), identified by the formation of fully glassy rod of 32 mm in diameter by tilt-pour casting, was reported. By comparing with the GFA of quarternary (La0.5Ce0.5)65Al10TM25 and ternary Ln65Al10TM25 alloys (Ln = La or Ce; TM = Co or Cu), we suggest that the strong frustration of crystallization by utilizing the coexistence of La-Ce and Co-Cu to complicate competing crystalline phases is helpful to construct BMG component with superior GFA.