Strain glass in Fe-doped Ti–Ni

Wang, Dong; Zhang, Zhen; Zhang, Jian; Zhou, Yumei; Wang, Yu; Ding, Xiangdong; Wang, Yunzhi; Ren, Xiaobing

doi:10.1016/j.actamat.2010.07.040

Cited by 170 publications

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References 34 publications

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“…Recent experimental studies have yielded strikingly similar ''phase diagrams'' of strain states for many different doped ferroelastic systems [12][13][14]. An example is given in Fig.…”

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confidence: 99%

“…An example is given in Fig. 1(a) for a Fe-doped TiNi system [12]. It describes clearly the relationships among all the strain states in ferroelastic systems and shows the following generic features: (i) at a critical doping level x c there exists a rather abrupt crossover from a normal martensitic transition (MT) (x < x c ) to a strain-glass transition (SGT) (x > x c ); (ii) a precursory strain state appears below a temperature T nd , which is well above the M s (MT start temperature) or T g (SGT temperature); (iii) both M s and T g decrease with increasing defect content while T nd decreases at low defect content but increases at high defect content.…”

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confidence: 99%

“…Point defects have been known to play a central role in altering and controlling the properties of ferroelastic materials [1]. In addition to the well-known paraelastic and ferroelastic strain states, it was found that point defects can generate two abnormal strain states: a ''precursory strain state'' (or tweed) characterized by a cross-hatched nanosized strain domain structure [2,3] imbedded in a dynamically disordered paraelastic matrix [4] and a new strain-glass state that is a frozen state of local strain order [5][6][7][8], a ferroelastic analogue to ferroelectric relaxors [9] and cluster spin glasses [10,11].Recent experimental studies have yielded strikingly similar ''phase diagrams'' of strain states for many different doped ferroelastic systems [12][13][14]. An example is given in Fig.…”

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confidence: 99%

“…Note that the peak position in ZFC curve was defined as the glass transition temperature T g [6,10] while the branching point between ZFC and FC curves was referred to as the static nano strain domains formation start temperature T nd [12,13], a temperature at which ergodicity starts to break. …”

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Modeling Abnormal Strain States in Ferroelastic Systems: The Role of Point Defects

et al. 2010

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Recent experiments have revealed a rich variety of strain states in doped ferroelastic systems. We study the origin of two abnormal strain states; precursory tweed and strain glass, and their relationship with the well-known austenite and martensite (the para-and ferroelastic states). A Landau free energy model is proposed, which assumes that point defects alter the global thermodynamic stability of martensite and create local lattice distortions that interact with the strain order parameters and break the symmetry of the Landau potential. Phase field simulations based on the model have predicted all the important signatures of a strain glass found in experiment. Moreover, the generic ''phase diagram'' constructed from the simulation results shows clearly the relationships among all the strain states, which agrees well with experimental measurements. DOI: 10.1103/PhysRevLett.105.205702 PACS numbers: 64.70.KÀ, 62.20.DÀ, 64.70.PÀ, 81.30.Kf Ferroelastic materials, are generally characterized by two distinct strain states, a strain-disordered paraelastic state (known as the parent phase or austenite) at high temperature and a long-range strain-ordered ferroelastic state (known as martensite) at low temperature. Point defects have been known to play a central role in altering and controlling the properties of ferroelastic materials [1]. In addition to the well-known paraelastic and ferroelastic strain states, it was found that point defects can generate two abnormal strain states: a ''precursory strain state'' (or tweed) characterized by a cross-hatched nanosized strain domain structure [2,3] imbedded in a dynamically disordered paraelastic matrix [4] and a new strain-glass state that is a frozen state of local strain order [5][6][7][8], a ferroelastic analogue to ferroelectric relaxors [9] and cluster spin glasses [10,11].Recent experimental studies have yielded strikingly similar ''phase diagrams'' of strain states for many different doped ferroelastic systems [12][13][14]. An example is given in Fig. 1(a) for a Fe-doped TiNi system [12]. It describes clearly the relationships among all the strain states in ferroelastic systems and shows the following generic features: (i) at a critical doping level x c there exists a rather abrupt crossover from a normal martensitic transition (MT) (x < x c ) to a strain-glass transition (SGT) (x > x c ); (ii) a precursory strain state appears below a temperature T nd , which is well above the M s (MT start temperature) or T g (SGT temperature); (iii) both M s and T g decrease with increasing defect content while T nd decreases at low defect content but increases at high defect content. This generic phase diagram could serve as an experimental validation of any theory proposed to explain the relationship among different strain states in ferroelastic systems.The nature of the precursory strain state (tweed) has been an interesting topic for decades, because it is neither a fully disordered strain state like an ideal austenite nor a fully ordered strain state like the poly-twinn...

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“…Recent experimental studies have yielded strikingly similar ''phase diagrams'' of strain states for many different doped ferroelastic systems [12][13][14]. An example is given in Fig.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Modeling Abnormal Strain States in Ferroelastic Systems: The Role of Point Defects

et al. 2010

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“…In addition, several studies reported on TiNiFe SMAs with ultra-high internal-friction properties, which are excellent candidates for high-damping applications. [11][12][13] Recently, D. Wang et al 14 established a complete temperature-composition phase diagram that included the pre-martensitic state, martensite and strain glass. They also reported that strain glass forms in TiNiFe SMAs when the Fe doping exceeds the critical value.…”

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Selective leaching and surface properties of TiNiFe shape-memory alloys

Chang¹,

Liou²,

Huang³

2017

Mater. tehnol.

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This study investigated the selective leaching and surface characteristics of Ti50Ni50-xFex (x = 1, 2, and 3) shape-memory alloys using inductively coupled plasma-mass spectrometry, X-ray diffractometry, electrochemical tests and X-ray photoelectron spectroscopy. According to our results, the concentrations of Ni and Fe ions selectively leached from each specimen were considerably higher than that of Ti ions. Electrochemical tests revealed a gradual deterioration in the corrosion resistance of the Ti50Ni50-xFex SMAs as the Fe content in the alloys was increased. X-ray photoelectron-spectroscopy results indicate that the surface of each specimen is primarily made up of a passive TiO2 film. NiO and Fe2O3 oxides, which also formed on the surfaces of the Ti50Ni50-xFex SMAs, caused a deterioration of the uniformity, undermining the protective effect of the TiO2 films, resulting in a highly selective leaching of the Ni and Fe ions. The Ti50Ni50-xFex SMAs exhibit a number of favourable properties compared to the other SMAs; however, high concentrations of selectively leached Ni and Fe ions may pose a risk in biomedical applications, particularly when used as implant materials. Keywords: TiNiFe shape-memory alloys, biomaterials, selective leaching, corrosion, X-ray photoelectron spectroscopy V {tudiji je prou~evano selektivno izpiranje in zna~ilnosti povr{ine zlitine s spominom Ti50Ni50-xFex (x = 1, 2, in 3), z uporabo masne spektrometrije z induktivno sklopljeno plazmo, rentgensko difrakcijo, elektrokemijskimi preizkusi in rentgensko fotoelektronsko spektroskopijo. Rezultati ka`ejo, da je bila koncentracija selektivno izpranih Ni in Fe ionov iz vsakega vzorca veliko ve~ja kot pa Ti ionov. Elektrokemijski preizkusi so pokazali postopno zmanj{anje korozijske odpornosti Ti50Ni50-xFex SMA, ko je vsebvnost Fe v zlitinah nara{~ala. Rezultati rentgenske fotoelektronske spektroskopije ka`ejo, da je povr{ina vseh vzorcev predvsem sestavljena iz pasivnih TiO2 plasti. NiO in Fe2O3 oksidi, ki so tudi nastali na povr{ini Ti50Ni50-xFex SMAs, poslab{ajo enotnost in ogro`ajo varovalno plast iz TiO2 prevlek, kar ima za posledico bolj selektivno izpiranje ionov Ni in Fe. Ti50Ni50-xFex SMAs vsebuje {tevilne ugodne lastnosti v primerjavi z drugimi SMA; vendar pa velika koncentracija selektivno izpranih Ni in Fe ionov lahko predstavlja tveganje pri biomedicinski uporabi, posebno pri implantiranih materialih. Klju~ne besede: TiNiFe zlitine s spominom, biomateriali, selektivno izpiranje, korozija, rentgenska fotoelektronska spektroskopija

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Quasi‐Linear Superelasticity with Ultralow Modulus in Tensile Cyclic Deformed TiNi Strain Glass

Zhao

Liang

et al. 2022

Adv Eng Mater

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Herein, a quasi‐linear superelasticity (≈2.3%) with the ultralow elastic modulus (≈18 GPa) over a wide temperature range (≈55 K) in tensile cyclic deformed TiNi shape memory alloys is reported. Differential scanning analysis (DSC) and dynamic mechanical analysis (DMA) show the suppression of normal martensitic transformation (MT) and the appearance of strain glass transition behavior. Electron backscatter diffraction (EBSD) analysis shows the existence of high‐density defects involving twin boundaries and dislocations under tensile cyclic deformation. Further transmission electron microscope (TEM) observation reveals stabilized B19' nanodomains after tensile cyclic deformation. The observed deformation defects and stabilized B19' nanodomains impose significant influence on the following transition behavior and mechanical property, yielding the detected quasi‐linear superelasticity with ultralow modulus. Herein, an effective way to design unique phase transitions with unprecedented properties by defect engineering may be suggested.

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Strain glass in Fe-doped Ti–Ni

Cited by 170 publications

References 34 publications

Modeling Abnormal Strain States in Ferroelastic Systems: The Role of Point Defects

Modeling Abnormal Strain States in Ferroelastic Systems: The Role of Point Defects

Selective leaching and surface properties of TiNiFe shape-memory alloys

Quasi‐Linear Superelasticity with Ultralow Modulus in Tensile Cyclic Deformed TiNi Strain Glass

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