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Full intermetallic compound (IMC) solder joints present fascinating advantages in high-temperature applications. In this study, the mechanical properties and elastic anisotropy of η'-Cu6Sn5 and Cu3Sn intermetallic compounds were investigated using first-principles calculations. The values of single-crystal elastic constants, the elastic (E), shear (G), and bulk (B) moduli, and Poisson's ratio (ν) were identified. In addition, the two values of G/B and ν indicated that the two IMCs were ductiledoi:10.3390/cryst11121562 fatcat:a3wldijshbb7tdirf65zy5ziom