Fig. 2: Cryogenic tensile property of the investigated alloys at 87 K.

a, Engineering stress–strain curve of our CoNiV-AlTi sample with a dual-scale ordering structure, compared with the base CoNiV(SS) and CoNiV-AlTi(SS) samples, the CoNiV(SSA) sample, and the aged CoNiV-AlTi sample containing large-sized (about 25 nm) L1₂ precipitates. c, IFFT image of the CoNiV(SSA) sample, showing the presence of SRO and its size and distribution. d, DF-TEM image of the 24-h aged CoNiV-AlTi sample, showing the presence of large-sized L1₂ precipitates. e, Strain-hardening-rate curves. The grain size of all these materials is similar (Supplementary Fig. 5). b, The product of tensile strength and total elongation as a function of yield strength of the CoNiV-AlTi alloy (at 87 K) with different grain sizes (Supplementary Fig. 6), compared with other high-performance alloys used or planned to be used in cryogenic applications, including various MEA and HEAs (for example, single-phase fcc MEA/HEAs, fcc MEA/HEAs with L1₂ or B2 ordered phases, transformation-induced plasticity (TRIP) MEA/HEAs, and body-centered cubic (bcc) MEA/HEAs), Fe-based alloys, Ni-based alloys, Al-based alloys and Ti-based alloys. All the data in this figure are from samples tested at near liquid-nitrogen temperature (77–110 K), and the associated details are listed in Supplementary Table 3. The error bars represent standard deviation. Scale bars, 1 nm (c), 50 nm (d).