Scanning electron microscopy, X-ray diffraction and thermal analysis study of the TiH2 foaming agent

Mandrino, Djordje; Paulin, Irena; Škapin, Srečo D.

doi:10.1016/j.matchar.2012.07.005

Cited by 47 publications

(21 citation statements)

References 17 publications

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“…Several in situ/ex situ studies have been focused on the thermal decomposition of TiH2 46,47]. However, it should be noted that the ex-situ XRD and TEM investigations may suffer from instant information loss in terms of the phase transformation during the heating process [19,27,30,46,47].…”

Section: Dehydrogenation Processmentioning

confidence: 99%

“…However, it should be noted that the ex-situ XRD and TEM investigations may suffer from instant information loss in terms of the phase transformation during the heating process [19,27,30,46,47]. Additionally, although in situ high temperature XRD and X-ray synchrotron/neutron diffraction techniques were applied, their results may still be of concern.…”

Section: Dehydrogenation Processmentioning

confidence: 99%

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An in situ Study of NiTi Powder Sintering Using Neutron Diffraction

Chen

Liss

Cao

2015

Metals

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This study investigates phase transformation and mechanical properties of porous NiTi alloys using two different powder compacts (i.e., Ni/Ti and Ni/TiH2) by a conventional press-and-sinter means. The compacted powder mixtures were sintered in vacuum at a final temperature of 1373 K. The phase evolution was performed by in situ neutron diffraction upon sintering and cooling. The predominant phase identified in all the produced porous NiTi alloys after being sintered at 1373 K is B2 NiTi phase with the presence of other minor phases. It is found that dehydrogenation of TiH2 significantly affects the sintering behavior and resultant microstructure. In comparison to the Ni/Ti compact, dehydrogenation occurring in the Ni/TiH2 compact leads to less densification, yet higher chemical homogenization, after high temperature sintering but not in the case of low temperature sintering. Moreover, there is a direct evidence of the eutectoid decomposition of NiTi at ca. 847 and 823 K for Ni/Ti and Ni/TiH2, respectively, during furnace cooling. The static and cyclic stress-strain behaviors of the porous NiTi alloys made from the Ni/Ti and Ni/TiH2 compacts were also investigated. As compared with the Ni/Ti sintered samples, OPEN ACCESSMetals 2015, 5 531 the samplessintered from the Ni/TiH2 compact exhibited a much higher porosity, a higher close-to-total porosity, a larger pore size and lower tensile and compressive fracture strength.

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Section: Dehydrogenation Processmentioning

confidence: 99%

Section: Dehydrogenation Processmentioning

confidence: 99%

An in situ Study of NiTi Powder Sintering Using Neutron Diffraction

Chen

Liss

Cao

2015

Metals

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“…These alloys find application in the artificial aging condition, which makes it possible to obtain excellent mechanical properties. [1][2][3][4][5][6][7][8][9][10][11][12] The physical properties exhibited by aluminium alloys are significantly influenced by the treatment of the sample. In all the above-mentioned applications, alloys are prone to corrode, while also exposed to severe atmospheric environments.…”

Section: Introductionmentioning

confidence: 99%

Influence of artificial aging on the electrochemical properties of the aluminium AA 6063 alloy

Donik¹

2018

Mater. Tehnol.

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The influence of artificial ageing on the corrosion behaviour of the aluminium alloy AA 6063 in chloride-containing solutions was studied to determine the correlation between aging parameters and corrosion through the electrochemical parameters. The present study showed that LM and standard SEM imaging with EDS observation does not expose significant differences for the artificially aged aluminium. Nevertheless, a special statistical technique with observation of the larger area showed a significant increase of the smallest precipitates which are the initial sites for the corrosion. With electrochemical measurements, we corroborated that increase of corrosion rate is directly connected to the number of precipitates and not with the total area of exposed precipitates. Scanning electron microscopy observations combined with EDS measurements were used also to establish the type of precipitates in the studied alloy. Keywords: aluminium, artificial aging, SEM, electrochemical measurements Raziskovali smo vpliv umetnega staranja na korozijske lastnosti aluminijeve zlitine AA 6063 z namenom ugotoviti soodvisnost med staranjem in elektrokemijskimi parametri. V raziskavi smo dokazali, da zgolj standardni pregled s svetlobnim in vrsti~nim elektronskim mikroskopom v kombinaciji z EDS-analizo na prvi pogled ne poka`e bistvenih razlik med razli~no toplotno obdelanimi vzorci. Ugotovili smo, da s pomo~jo preiskave na ve~jem podro~ju in s statisti~no obdelavo lahko odkrijemo povezave predvsem med manj{imi izlo~ki in elektrokemijskimi parametri. S korozijskimi meritvami smo tudi potrdili, da je pove~anje korozijske hitrosti direktno povezano s {tevilom majhnih izlo~kov in ne s se{tevkom povr{ine vseh izlo~kov. S SEM-analizo v kombinaciji z EDS-analizo smo uporabili za dolo~itev vrst vklju~kov v preiskovani zlitini.

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“…The mismatch between the decomposition temperature of the TiH 2 and the melting point of the pure metal or its alloy is the biggest problem in the PM process. A group of researchers [13,14] has focused on overcoming this problem. Some experimental papers have been published on the kinetics of hydrogen release [14].…”

Section: Introductionmentioning

confidence: 99%

“…Some experimental papers have been published on the kinetics of hydrogen release [14]. When TiH 2 is heat-treated under an air atmosphere, an oxide layer is formed on the surface of the particles [13,14]. Basically, it is very crucial to investigate the effective factors on the PM process.…”

Section: Introductionmentioning

confidence: 99%

Novel Molding Method and Enhanced Cell Homogeneity in the Powder Metallurgical Route for Production of Closed Cell Al-Foam

et al. 2017

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TiH2 content, mixing, pressing, different mold filling rate as the factors which affect foaming process on the powder metallurgical route were investigated. TiH2 was added in the amount of 0.5-1-1.5-2 wt% to adjust the proper amount. Differential scanning calorimetry tests were conducted on the TiH2 powders in order to obtain optimum hydrogen releasing condition. Aluminum and TiH2 powders were blended with the different speedtime combination. The mix was compacted at different pressures with the aim of explaining of the oxide layer deformation. An acceptance-rejection criterion was developed and used in pore analysis. Also, the using of a borosilicate glass molding technique are completely original and a new approach.

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Scanning electron microscopy, X-ray diffraction and thermal analysis study of the TiH2 foaming agent

Cited by 47 publications

References 17 publications

An in situ Study of NiTi Powder Sintering Using Neutron Diffraction

An in situ Study of NiTi Powder Sintering Using Neutron Diffraction

Influence of artificial aging on the electrochemical properties of the aluminium AA 6063 alloy

Novel Molding Method and Enhanced Cell Homogeneity in the Powder Metallurgical Route for Production of Closed Cell Al-Foam

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