A method for determination of Avrami parameters directly from isothermal calorimetry data

Thermochimica Acta

Volumn 291, Issue 1-2, 1997, Pages 59-64

  Smith, George W ^a  

^a GENERAL MOTORS CORPORATION   (United States)

Author keywords

Aluminum alloys; Avrami parameters; Calorimetry; Differential isothermal calorimetry; Precipitation

Indexed keywords

EID: 0007523667     PISSN: 00406031     EISSN: None     Source Type: Journal    
DOI: 10.1016/s0040-6031(96)03096-1     Document Type: Article

References (9)

1. M.E. Fine, Phase Transformations in Condensed Systems, MacMillan, New York (1964) p. 62.
2. J.W. Christian, The Theory of Transformations in Metals and Alloys, Pergamon, Oxford (1965) p. 487.
3. V. Raghavan and M. Cohen, in N.B. Hannay (Ed.), Treatise on Solid State Chemistry, Vol. 5, Plenum, New York (1975) p. 96.
4. R.H. Doremus, Rates of Phase Transformations, Academic Press, Orlando (1985) p. 22.
5. G.W. Smith, Scripta Metallurgica et Materialia 31 (1994) 357.
6. Alloy 339 contains ∼ 1% Cu, ∼ 1% Mg, and ∼12% Si.
7. It has been pointed out [J. Malek, Thermochimica Acta, 267 (1995) 81] that the double logarithmic plot used to determine Avrami constants is rather insensitive to subtle changes in the fraction of material transformed. Therefore, its linearity cannot be considered to be a general proof of validity of Eq. (1).
8. Jandel Scientific, 2591 Kerner Blvd., San Rafael, CA 94901, USA.
9. Alloy 9456 contains 3.5% Cu and ∼ 0.05% Sn. The solution treatment consisted of heating at 527°C for 16 h, followed by a water quench.