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Thermal control of interphase microstresses and properties of aluminum-silicon alloys

  • Nonferrous Metals and Alloys
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    The thermal microstresses at phase boundaries in alloy SAS-1 immediately after preparation are close to the yield strength of the material and independent of its condition (powdered or extruded). The stresses increase with the dispersity of the original material (powder).

  2. 2.

    Thermal cycling (−196 to +100o) reduces the interphase microstresses by 50%. The effect of lowering the stress attenuates rapidly after the first few cycles. Complete stress relaxation is not achieved even after treatment in liquid helium (−269o). Stress relaxation is more complete in material manufacturred from powder of lower dispersity.

  3. 3.

    Relaxation of interphase stresses in the process of cryogenic treatment is accompanied by a 40% drop of the toughness and reduction of the low-cycle fatigue strength by more than 50%.

  4. 4.

    The lower properties of the material after cryogenic treatment are due to brittle fracture of phases and the development of microcracks at interphase boundaries as is confirmed by fractographic analysis of the material before and after cryogenic treatment.

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Literature cited

  1. G. A. Malygin and V. A. Likhachev, "Anisotropy of thermal expansion and thermal microstresses", Zavod. Lab.,32, No. 3, 335 (1966).

    Google Scholar 

  2. A. Denton, Metallurgical Reviews,11, No. 101, 1 (1966).

    Google Scholar 

  3. J. Kraus, Pokroky Práskové Metalurgie, No. 4, 43 (1966).

    Google Scholar 

  4. C. Liu and J. Gurland, TASM,58, No. 1, 66 (1965).

    Google Scholar 

  5. D. French, J. Amer. Ceram. Soc.,52, No. 5, 267 (1969).

    Google Scholar 

  6. A. I. Samoilov, A. I. Krivko, and L. P. Evsyukova, "Thermal expansion of phases and stress in alloy SAS-1", in: Thermophysical Properties of Metals and Alloys [in Russian], ONTI VIAM (1973), p. 55.

  7. I. Kh. Lokshin, "Dimensional stability of aluminum alloy SAS-1 with a low coefficient of thermal expansion", Tekhnologia Legkikh Splavov, No. 3, 21 (1971).

    Google Scholar 

  8. M. L. Khenkin and I. Kh. Lokshin, Dimensional Stability of Metals and Alloys in Precision Machines and Instruments [in Russian], Mashinostroenie, Moscow (1974).

    Google Scholar 

  9. A. I. Samoilov, A. I. Krivko, and V. S. Kozlova, "X-ray analysis of thermal interphase microstresses", Zavod. Lab.,37, No. 9, 1093 (1971).

    Google Scholar 

  10. L. Benson, "Origin and significance of residual welding stresses", in: Residual Stresses in Metals and Metal Structures [Russian translation], IL, Moscow (1957), p. 89.

    Google Scholar 

  11. A. T. Tumanov (editor), Methods of Testing, Control, and Investigation of Machine Construction Materials. Handbook [in Russian], Mashinostroenie, Moscow (1971).

    Google Scholar 

  12. T. Kelso, The Tool and Manufacturing Engineer,61, No. 3, 48 (1968).

    Google Scholar 

  13. G. Wozney and G. Crawmer, Welding J.,47, No. 9, 411 (1968).

    Google Scholar 

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Authors
  1. A. I. Samoilov
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  2. A. I. Krivko
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  3. V. S. Kozlova
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  4. I. P. Zhegina
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Additional information

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 51–54, February, 1976.

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Samoilov, A.I., Krivko, A.I., Kozlova, V.S. et al. Thermal control of interphase microstresses and properties of aluminum-silicon alloys. Met Sci Heat Treat 18, 157–160 (1976). https://doi.org/10.1007/BF00664156

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  • DOI: https://doi.org/10.1007/BF00664156

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