Component-selection criteria for joining dissimilar bulk metallic glasses without overlapping supercooled liquid regions

Joining dissimilar bulk metallic glasses (BMGs) within their supercooled liquid region (SCLR) is crucial for size scaling and functional integration, yet it remains challenging for alloy pairs lacking overlapping SCLRs. In this work, we demonstrate that this limitation can be overcome by exploiting crystallization kinetics to establish quantitative composition-selection criteria. By fitting crystallization data from 53 BMGs compositions using the Lasocka equation, we derived the heating-rate sensitivity parameters for the glass transition temperature( T g ) and crystallization temperature( T x ), along with the sensitivity ratio K = B x /B g . These parameters enabled the construction of a Bg-Bx map, which classifies alloys based on their distinct SCLR evolution ( K > 1, K ≈ 1, or K < 1). Based on this classification, we propose three sufficient criteria for inducing SCLR overlap in initially incompatible pairs at elevated heating rates. An evaluation of 1,378 pairwise combinations revealed that although 921 pairs lacked overlap at 0.333 K/s, 730 satisfied our proposed criteria and successfully developed overlap as the heating rate increased. Notably, 483 of 730 pairs can achieve supercooled liquid-phase joining within experimentally accessible rates (0–10 6 K/s). This research provides a new perspective on the process design level of the connection and manufacturing of amorphous alloys and offers a robust theoretical model for manufacturing more complex amorphous alloy components.