Microstructure of (Y + Sm)–α-sialon with a-sialon seeds

Chen, Weiwu; Sun, Weiying; Li, Yawen; Yan, Dongsheng

doi:10.1557/jmr.2000.0319

Cited by 21 publications

(22 citation statements)

References 8 publications

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“…This changing trend on crystal dimension with the amount of seeds is consistent with the previous study reported by Chen et al . and Brandon et al …”

Section: Resultssupporting

confidence: 93%

“…It is clear that as the amount of seeds increases (excluding unseeded sample fired for 2 h), the average length of crystals gradually decreases from 35 to 12 lm, and the average width decreases from 17 to 2 lm, but the average aspect ratios increases monotonically from 2 to 6.25. This changing trend on crystal dimension with the amount of seeds is consistent with the previous study reported by Chen et al 24 and Brandon et al 25 .In general, the phase transformation and crystal growth of a-Sialon generally takes place by dissolution-diffusion-precipitation from liquid, 26 which could be also noted from Fig. 6(a).…”

Section: Resultssupporting

confidence: 90%

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Effect of Y‐α‐Sialon Seeding and Holding Time on the Formation of Elongated (Ca,Dy)‐α‐Sialon Crystals Prepared via Carbothermal Reduction and Nitridation

et al. 2012

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Single‐phase (Ca,Dy)‐α‐Sialon with elongated crystals and high aspect ratios was prepared at 1700°C by carbothermal reduction and nitridation (CRN) with Y‐α‐Sialon seed crystals. Effects of Y‐α‐Sialon seeding and holding time on the phase assemblage and crystal morphology of CRN products were discussed. The results showed that adding seed crystals and prolonging holding time could facilitate not only phase transformation, but also crystal refinement. Moreover, they resulted in the increase of the aspect ratios of α‐Sialon crystals, due to the decreasing range in the crystal width exceeding that in the length. In addition, a highly unusual phenomenon of crystal size reduction during reaction was observed in the seeded samples with the holding time extending from 2 to 4 h. Crystallization from liquid phase and growth followed by nucleation based on the surface of existing large crystals were the growth modes of elongated α‐Sialon crystals.

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“…This changing trend on crystal dimension with the amount of seeds is consistent with the previous study reported by Chen et al . and Brandon et al …”

Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 90%

Effect of Y‐α‐Sialon Seeding and Holding Time on the Formation of Elongated (Ca,Dy)‐α‐Sialon Crystals Prepared via Carbothermal Reduction and Nitridation

et al. 2012

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“…In this way, ␣-SiAlON, which is isostructural to ␣-Si 3 N 4 , should also be able to develop into elongated grains. 16 However, in the conventional sintered ␣-SiAlON ceramics, few elongated grains can be found, and most grains exhibit an equiaxed morphology. This is because ␣-Si 3 N 4 is usually used as raw materials, resulting in the high driving force for phase transformation and too much nuclei produced.…”

Section: Resultsmentioning

confidence: 99%

Study on the anisotropic growth of rod-like Yb α-SiAlON crystals prepared by combustion synthesis

et al. 2004

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In this paper, single-phase Yb ␣-SiAlON powder with rod-like crystals was fabricated by combustion synthesis. The microstructural development of the rod-like ␣-SiAlON crystals was studied, and anisotropic grain growth was observed. Furthermore, the growth mechanism of the rod-like ␣-SiAlON crystals was investigated, and the experimental results indicated that during the anisotropic grain growth, the fast growth plane was the basal plane in the hexagonal crystal lattice.

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“…9 But the path to preferentially propagate within the primary particles or along the boundaries was determined by the aging time and the resulting microstructures.…”

Section: Effect Of Quench Aging Treatment On Tensile Propertiesmentioning

confidence: 99%

Effects of quench aging treatment on microstructure and tensile properties of thixoformed ZA27 alloy

Chen¹,

Yuan²,

Li³

2007

Materials Science and Technology

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The effects of quench aging heat treatment on microstructure and tensile properties of thixoformed ZA27 alloy were investigated. The results indicated that the microstructure of the alloy became into polygonal b phase particles after solid solution treatment at 350uC for 48 h. The b particles then decomposed into a and g phases which would coarsen during the subsequent aging at 150uC. It was observed that the Zn concentration in the b phase near the polygonal boundaries was higher than that within the b particles. As a consequence, both the decomposition speed of the former b phase and the subsequent coarsening speed were faster than those of the latter b phase. Thus, a and g phases near the boundaries were always coarser than those within the particles during aging. Owing to the coarsening, the ultimate tensile strength continuously decreased with increasing aging time. The percentage elongation increased up to 10 h, but decreased with aging time owing to bad deformation accommodation and low bonding strength between particles. Cracks initiated from some defects (e.g. inclusions and porosities) during tensile test, and the path for the cracks to propagation changed with the aging time.

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Microstructure of (Y + Sm)–α-sialon with a-sialon seeds

Cited by 21 publications

References 8 publications

Effect of Y‐α‐Sialon Seeding and Holding Time on the Formation of Elongated (Ca,Dy)‐α‐Sialon Crystals Prepared via Carbothermal Reduction and Nitridation

Effect of Y‐α‐Sialon Seeding and Holding Time on the Formation of Elongated (Ca,Dy)‐α‐Sialon Crystals Prepared via Carbothermal Reduction and Nitridation

Study on the anisotropic growth of rod-like Yb α-SiAlON crystals prepared by combustion synthesis

Effects of quench aging treatment on microstructure and tensile properties of thixoformed ZA27 alloy

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