Characterization of AC8A/Al2O3 composites after long exposure at elevated temperatures

J. C. Huang; C. S. Liauo; P. W. Kao; H. Chang

Characterization of AC8A/Al₂O₃ composites after long exposure at elevated temperatures

J. C. Huang, C. S. Liauo, P. W. Kao, H. Chang

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

Abstract

The microstructural evolution and mechanical properties of the AC8A/12vol% Al₂O_3(sf) composite fabricated by squeeze casting has been characterized. Thermal treatments included the normal T6 temper, and thermal exposure at 150, 250, 300, and 350 °C for 400 h. The predominant strengthening phase in matrix appeared to be the Mg₂Si needles, following normal coarsening behavior. Bulk pure Si, B-type, and β particles were commonly seen. The B-type phase might included the hexagonal Al₃(Ni,Cu,Fe)₂ and the orthorhombic Al₃(Ni,Cu,Fe) phases. Both the Si, B and β dispersolids were not obviously affected by the artificial aging at 150-350 °C. No interfacial reaction product, except the SiO₂ gel used as binder was observed along the fiber/matrix interface even after long exposure at 350 °C. The tensile behaviors of the AC8A alloys and composites after thermal exposure were evaluated over the temperature range from 25 to 350 °C. The composites showed similar strength as the matrix alloy at room temperature, but exhibited higher strength at temperatures higher than 250 °C. The strength levels of both the alloys and composites were significantly reduced after long thermal exposure, especially for temperatures higher than 250 °C. The loss of strength after long term exposure at elevated temperatures may be attributed to the age-softening of the matrix.

Original language	English
Title of host publication	High performance metal and ceramic matrix composites
Subtitle of host publication	proceedings of a symposium sponsored by the Structural Materials Division of TMS, held during the 1994 TMS annual meeting, San Francisco, California, February 27-March 3, 1994
Editors	Kamleshwar Upadhya
Publisher	Minerals, Metals & Materials Society
Pages	183-191
ISBN (Print)	0873392663, 9780873392662
Publication status	Published - Feb 1994
Externally published	Yes
Event	Conference on High Performance Metal and Ceramic Matrix Composites (held during the 1994 TMS Annual Meeting) - San Francisco, United States Duration: 27 Feb 1994 → 3 Mar 1994

Conference

Conference	Conference on High Performance Metal and Ceramic Matrix Composites (held during the 1994 TMS Annual Meeting)
Place	United States
City	San Francisco
Period	27/02/94 → 3/03/94

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Huang, J. C., Liauo, C. S., Kao, P. W., & Chang, H. (1994). Characterization of AC8A/Al₂O₃ composites after long exposure at elevated temperatures. In K. Upadhya (Ed.), High performance metal and ceramic matrix composites: proceedings of a symposium sponsored by the Structural Materials Division of TMS, held during the 1994 TMS annual meeting, San Francisco, California, February 27-March 3, 1994 (pp. 183-191). Minerals, Metals & Materials Society.

Huang, J. C. ; Liauo, C. S. ; Kao, P. W. et al. / Characterization of AC8A/Al₂O₃ composites after long exposure at elevated temperatures. High performance metal and ceramic matrix composites: proceedings of a symposium sponsored by the Structural Materials Division of TMS, held during the 1994 TMS annual meeting, San Francisco, California, February 27-March 3, 1994. editor / Kamleshwar Upadhya. Minerals, Metals & Materials Society, 1994. pp. 183-191

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title = "Characterization of AC8A/Al2O3 composites after long exposure at elevated temperatures",

abstract = "The microstructural evolution and mechanical properties of the AC8A/12vol% Al2O3(sf) composite fabricated by squeeze casting has been characterized. Thermal treatments included the normal T6 temper, and thermal exposure at 150, 250, 300, and 350 °C for 400 h. The predominant strengthening phase in matrix appeared to be the Mg2Si needles, following normal coarsening behavior. Bulk pure Si, B-type, and β particles were commonly seen. The B-type phase might included the hexagonal Al3(Ni,Cu,Fe)2 and the orthorhombic Al3(Ni,Cu,Fe) phases. Both the Si, B and β dispersolids were not obviously affected by the artificial aging at 150-350 °C. No interfacial reaction product, except the SiO2 gel used as binder was observed along the fiber/matrix interface even after long exposure at 350 °C. The tensile behaviors of the AC8A alloys and composites after thermal exposure were evaluated over the temperature range from 25 to 350 °C. The composites showed similar strength as the matrix alloy at room temperature, but exhibited higher strength at temperatures higher than 250 °C. The strength levels of both the alloys and composites were significantly reduced after long thermal exposure, especially for temperatures higher than 250 °C. The loss of strength after long term exposure at elevated temperatures may be attributed to the age-softening of the matrix.",

author = "Huang, {J. C.} and Liauo, {C. S.} and Kao, {P. W.} and H. Chang",

year = "1994",

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language = "English",

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pages = "183--191",

editor = "Kamleshwar Upadhya",

booktitle = "High performance metal and ceramic matrix composites",

publisher = "Minerals, Metals & Materials Society",

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Huang, JC, Liauo, CS, Kao, PW & Chang, H 1994, Characterization of AC8A/Al₂O₃ composites after long exposure at elevated temperatures. in K Upadhya (ed.), High performance metal and ceramic matrix composites: proceedings of a symposium sponsored by the Structural Materials Division of TMS, held during the 1994 TMS annual meeting, San Francisco, California, February 27-March 3, 1994. Minerals, Metals & Materials Society, pp. 183-191, Conference on High Performance Metal and Ceramic Matrix Composites (held during the 1994 TMS Annual Meeting), San Francisco, California, United States, 27/02/94.

Characterization of AC8A/Al₂O₃ composites after long exposure at elevated temperatures. / Huang, J. C.; Liauo, C. S.; Kao, P. W. et al.
High performance metal and ceramic matrix composites: proceedings of a symposium sponsored by the Structural Materials Division of TMS, held during the 1994 TMS annual meeting, San Francisco, California, February 27-March 3, 1994. ed. / Kamleshwar Upadhya. Minerals, Metals & Materials Society, 1994. p. 183-191.

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

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N2 - The microstructural evolution and mechanical properties of the AC8A/12vol% Al2O3(sf) composite fabricated by squeeze casting has been characterized. Thermal treatments included the normal T6 temper, and thermal exposure at 150, 250, 300, and 350 °C for 400 h. The predominant strengthening phase in matrix appeared to be the Mg2Si needles, following normal coarsening behavior. Bulk pure Si, B-type, and β particles were commonly seen. The B-type phase might included the hexagonal Al3(Ni,Cu,Fe)2 and the orthorhombic Al3(Ni,Cu,Fe) phases. Both the Si, B and β dispersolids were not obviously affected by the artificial aging at 150-350 °C. No interfacial reaction product, except the SiO2 gel used as binder was observed along the fiber/matrix interface even after long exposure at 350 °C. The tensile behaviors of the AC8A alloys and composites after thermal exposure were evaluated over the temperature range from 25 to 350 °C. The composites showed similar strength as the matrix alloy at room temperature, but exhibited higher strength at temperatures higher than 250 °C. The strength levels of both the alloys and composites were significantly reduced after long thermal exposure, especially for temperatures higher than 250 °C. The loss of strength after long term exposure at elevated temperatures may be attributed to the age-softening of the matrix.

AB - The microstructural evolution and mechanical properties of the AC8A/12vol% Al2O3(sf) composite fabricated by squeeze casting has been characterized. Thermal treatments included the normal T6 temper, and thermal exposure at 150, 250, 300, and 350 °C for 400 h. The predominant strengthening phase in matrix appeared to be the Mg2Si needles, following normal coarsening behavior. Bulk pure Si, B-type, and β particles were commonly seen. The B-type phase might included the hexagonal Al3(Ni,Cu,Fe)2 and the orthorhombic Al3(Ni,Cu,Fe) phases. Both the Si, B and β dispersolids were not obviously affected by the artificial aging at 150-350 °C. No interfacial reaction product, except the SiO2 gel used as binder was observed along the fiber/matrix interface even after long exposure at 350 °C. The tensile behaviors of the AC8A alloys and composites after thermal exposure were evaluated over the temperature range from 25 to 350 °C. The composites showed similar strength as the matrix alloy at room temperature, but exhibited higher strength at temperatures higher than 250 °C. The strength levels of both the alloys and composites were significantly reduced after long thermal exposure, especially for temperatures higher than 250 °C. The loss of strength after long term exposure at elevated temperatures may be attributed to the age-softening of the matrix.

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Huang JC, Liauo CS, Kao PW, Chang H. Characterization of AC8A/Al₂O₃ composites after long exposure at elevated temperatures. In Upadhya K, editor, High performance metal and ceramic matrix composites: proceedings of a symposium sponsored by the Structural Materials Division of TMS, held during the 1994 TMS annual meeting, San Francisco, California, February 27-March 3, 1994. Minerals, Metals & Materials Society. 1994. p. 183-191