Evidence for Strain Glass in the Ferroelastic-Martensitic SystemTi50−xNi50+x

Abstract

We report here "strain glass," a new glassy phenomenon in ferroelastic-martensitic system of Ni-rich intermetallic Ti(50-x)Ni(50+x) (x > 1), where local strain is frozen in disordered configuration below a critical temperature Tg. The ac elastic modulus shows a minimum at Tg, which exhibits logarithmic frequency dependence following Vogel-Fulcher relationship, and the corresponding internal friction shows a frequency-dependent peak located at a lower temperature. In situ high-resolution transmission electron microscopy observations reveal uncorrelated nanoclusters of martensiticlike phase, randomly frozen in the otherwise untransformed parentlike matrix. Being parallel to spin glass and relaxor, strain glass may shed new light on the fundamental physics of glass and lead to the discovery of novel properties.

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5Zhang1, Wang2, Ding3 et al. 2011Phys. Rev. BSelf Cite281190View full textAdd to dashboardCite

“…The STG transition was proved experimentally by frequency dispersion 10 in its AC mechanical properties and breaking down of ergodicity 3 . These key glassy features of STG were recently reproduced theoretically by Landau-Ginsburg simulations 14,15 .…”

“…Recently, a "strain glass" (STG) was discovered in a binary ferroelastic/martensitic system of Ti 50-x Ni 50+x (x≥1.5) alloy, which originates from the random local stresses of point defects [10][11][12] . These random local stresses dictate the local strain orders and hence prohibit the formation of long-range strain ordering.…”

Effect of randomness on ferroelastic transitions: Disorder-induced hysteresis loop rounding in Ti-Nb-O martensitic alloy

“…2͑f͔͒, the nanodomains grow in size and number, and spread throughout the specimen. In many other martensitic systems, similar microstructures appear as a nanodomain 9,29 like observed here or a mottled tweed structure 30 ͑nanoscale texture of the lattice strain͒ observed in Ni-Al ͑Ref. 31͒ and Fe-Pd ͑Ref.…”

“…The strain glass state can be obtained by sufficient doping of random point defects, which prevents the formation of long-range strain order ͑martensite͒ and freezes the local lattice strain in disordered configuration at T g . [9][10][11][12][13][14] In the Ti-Nb-O case the interstitial oxygen atom acts as a strong random point defect. Thus, the observed violation of the Clausius-Clapeyron relationship in 0.3O and 0.5O alloys is attributable to the transition into a glassy state when cooled below an ideal freezing temperature T 0 ͓ϳ240 K ͑0.3O͒ and ϳ230 K ͑0.5O͔͒.…”

“…Glassiness is a typical example, studied intensively in the past decades. Spin glass in ferromagnetics, 7 relaxor in ferroelectrics, 8 and recently discovered strain glass ͑SG͒ in ferroelastic martensites [9][10][11][12][13][14] share common signature of glass. For example, they exhibit a frequency-dependent anomaly in the response function ͑magnetic susceptibility, dielectric constant, and strain susceptibility, respectively͒ and history dependence of the order parameter on whether field-cooling or zero-field-cooling process.…”