EBSD-based phase identification in glass-ceramics of the Y 2 O 3 -Al 2 O 3 -SiO 2 system containing α- and β-Y 2 Si 2 O 7

Wisniewski, Wolfgang; Keshavarzi, Askan; Zscheckel, Tilman; Rüssel, Christian

doi:10.1016/j.jallcom.2016.12.301

Cited by 14 publications

(13 citation statements)

References 25 publications

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“…Although the problems of analyzing samples containing multiple phases of the composition Y 2 Si 2 O 7 have been illustrated2526272829, XRD-patterns acquired from various glass-ceramic samples annealed in this system are presented in Fig. 1 along with the theoretical patterns of phases indicated in this system by EBSD-analyses which will be presented later.…”

Section: Resultsmentioning

confidence: 99%

“…By analogy, many compositions in the Y 2 O 3 /Al 2 O 3 /SiO 2 system show the crystallization of various crystallographically different YS phases and yttrium aluminum garnet (YAG)26272829. At least seven YS phases have been described in the literature so far3031 and a small overview of the literature was recently presented in ref.…”

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confidence: 99%

“…At least seven YS phases have been described in the literature so far3031 and a small overview of the literature was recently presented in ref. 29. An additional phase associated with the unindexed JCPDS-file 21-1459 was denoted as “z-Y 2 Si 2 O 7 ” and described as a “lowest temperature phase” in ref.…”

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confidence: 99%

“…However, β-, δ- and ε-YS have been shown to simultaneously occur in some YAG-containing glass-ceramics26272829 while α-YS was additionally observed in glass-ceramics grown from an SiO 2 -MgO-Al 2 O 3 -ZrO 2 -Y 2 O 3 glass with a higher Al content25. These results also illustrated that an X-ray diffraction (XRD)-analysis of these phases is problematic if they occur simultaneously due to multiple peak super positions, a problem illustrated in detail in ref.…”

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Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Wisniewski

Seidel

Patzig

et al. 2017

Sci Rep

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The crystallization behavior of a glass with the composition 54.7 SiO2·10.9 Al2O3·15.0 MgO·3.4 ZrO2·16.0 Y2O3 is studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) including electron backscatter diffraction (EBSD) and (scanning) transmission electron microscopy [(S)TEM] including energy-dispersive X-ray spectrometry (EDXS). This glass shows the sole surface crystallization of four different yttrium silicates of the composition Y2Si2O7 (YS). The almost simultaneous but independent nucleation of α-, β-, δ-, and ε-YS at the surface is followed by growth into the bulk, where ε-YS quickly dominates a first crystallized layer. An accumulation of Mg at the growth front probably triggers a secondary nucleation of β-YS, which forms a thin compact layer before fragmenting into a highly oriented layer of fine grained crystals occupying the remaining bulk. The residual glass between the YS growth structures allows the crystallization of indialite, yttrium stabilized ZrO2 (Y-ZrO2) and very probably μ-cordierite during cooling. Hence, this glass basically shows the inverted order of crystallization observed in other magnesium yttrium alumosilicate glasses containing less Y2O3. An epitaxial relationship between Y-ZrO2 and ε-YS is proven and multiple twinning relationships occur in the YS phases.

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Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Wisniewski

Seidel

Patzig

et al. 2017

Sci Rep

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“…Many studies on the phase equilibrium, phase separation, and crystallization behavior of the Al 2 O 3 -Y 2 O 3 -SiO 2 system under long heat-treatment conditions (from room temperature to 1350 • C) have been reported [27][28][29][30][31][32]. The phase separation as an early stage of crystallization was observed during heat treatment of the glassy system [27] and the two phases of Y 2 O 3 -SiO 2 and Al 2 O 3 -SiO 2 precipitated from the Al 2 O 3 -Y 2 O 3 -SiO 2 system due to the diffusion of Al 3+ and O 2− during heat treatment [29,32].…”

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Transformation of Oxide Inclusions in Stainless Steel Containing Yttrium during Isothermal Heating at 1473 K

Zhang

Yang

et al. 2019

Metals

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To provide fundamental information on the control of rare earth inclusions in solid steel, two 18 mass% Cr-8 mass% Ni stainless steels with different yttrium additions were prepared using an electric resistance furnace and the evolution of yttrium-based oxide inclusions during heat treatment of the steels at 1473 K was investigated. In both as-cast steels, homogeneous spherical Al-Y-Si(-Mn-Cr) oxide inclusions were observed; however, the steel with larger yttrium additions also had some heterogeneous oxide inclusions with double phases. After heating, a new oxide phase with higher yttrium content precipitated from the original inclusions and resulted in partitioning to Y-rich and Al-rich parts in both steels. The average size and number density of inclusions slightly increased, and the morphology of inclusions changed from spherical to irregular. The transformation mechanism during isothermal heating was proposed to be the mutual effects of (i) internal transformation of the yttrium-based inclusions owing to crystallization of glassy oxide and (ii) interfacial reaction between inclusions and the steel matrix.Metals 2019, 9, 961 2 of 15 morphology of inclusions changed from dendritic to globular. A similar result was also observed by Katsumata et al. in 25 mass% Cr-6 mass% Ni stainless steel [8]. Kwon et al. [9,10] investigated the evolution of inclusions in Al-killed stainless steel with Ce addition at 1873 K. Mn(Cr)-silicates were found to be the primary inclusions before Al addition. When Al was added without Ce addition, the initial Mn(Cr)-silicate changed to Al 2 O 3 -rich inclusions. Then, Al-Ce complex inclusions were formed in the steel after Ce addition due to the reaction between Ce and Al 2 O 3 particles. Jönsson et al. [11,12] investigated the three-dimensional characteristics of clusters in REM-alloyed (Ce, La, Pr, and Nd) stainless steel through an electrolytic extraction method. It was found that most of the REM cluster consisted of regular and irregular REM-oxides, and the size of these clusters varied in the range of 2 to 23 µm. Moreover, turbulent collisions were determined to be the dominant form for the growth of REM clusters. With increasing the size of clusters, the growth rate of REM clusters increased.The changing behavior of rare earth inclusions in molten steel is relatively clear now; however, less attention has been paid to the possible transformation of rare earth inclusions in solid steel during heat treatment. This is practically important because steel quality significantly depends on the final state of inclusions after different thermal and mechanical treatments [13]. Many researchers have reported that some inclusions would change during heat treatment [14][15][16][17][18][19][20][21]. In 18 mass% Cr-8 mass% Ni austenitic stainless steel, MnO-SiO 2 oxide inclusions changed to finer MnO-Cr 2 O 3 spinel during heat treatment at 1473 K due to the interfacial reaction between inclusions and steel matrix [14][15][16][17][18]. Grain growth during heat treatment was also suppressed effec...

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Phase identification of individual crystalline particles by combining EDX and EBSD: application to workplace aerosols

Ervik

Benker²,

Weinbruch

et al. 2018

Anal Bioanal Chem

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This paper discusses the combined use of electron backscatter diffraction (EBSD) and energy dispersive X-ray microanalysis (EDX) to identify unknown phases in particulate matter from different workplace aerosols. Particles of α-silicon carbide (α-SiC), manganese oxide (MnO) and α-quartz (α-SiO) were used to test the method. Phase identification of spherical manganese oxide particles from ferromanganese production, with diameter less than 200 nm, was unambiguous, and phases of both MnO and MnO were identified in the same agglomerate. The same phases were identified by selected area electron diffraction (SAED) in transmission electron microscopy (TEM). The method was also used to identify the phases of different SiC fibres, and both β-SiC and α-SiC fibres were found. Our results clearly demonstrate that EBSD combined with EDX can be successfully applied to the characterisation of workplace aerosols. Graphical abstract Secondary electron image of an agglomerate of manganese oxide particles collected at a ferromanganese smelter (a). EDX spectrum of the particle highlighted by an arrow (b). Indexed patterns after dynamic background subtraction from three particles shown with numbers in a

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EBSD-based phase identification in glass-ceramics of the Y 2 O 3 -Al 2 O 3 -SiO 2 system containing α- and β-Y 2 Si 2 O 7

Cited by 14 publications

References 25 publications

Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Transformation of Oxide Inclusions in Stainless Steel Containing Yttrium during Isothermal Heating at 1473 K

Phase identification of individual crystalline particles by combining EDX and EBSD: application to workplace aerosols

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