Superelastic materials capable of recovering large nonlinear strains are ideal for various applications in morphing structures, reconfigurable systems, and robots. However, making oxide materials superelastic has been a long-standing challenge due to their intrinsic brittleness. The only macroscopically brittle oxide recently discovered to be superelastic is ZrO2-based micropillars or particles, which are realized via austenite-martensite phase transformation. Although ultimate strengths approaching the theoretical limit have been demonstrated in nanoscale samples, long fatigue life is elusive, which is arguably more important for most applications. Poor fatigue life has been a long-standing challenge for oxide ceramics in general.