a Representative reduced pair-distribution functions, G(r), at different temperatures ranging from 293 to 79 K. The inset shows the main three atomic pair correlations (Zr–Zr, Zr–Cu, and Zr–Ni) dominating the peak position shift in the first maximum. b Variations in the averaged strain calculated using the peak positions of G(r) and S(q) at different temperatures. Upon cooling, the MRO shows larger cooling contraction than the SRO, indicating that nonaffine thermal strain exists in the MRO and SRO. The lower the temperature is, the larger the difference in thermal strain. The fitted lines are for guiding the eye.