Improvement of Strength and Ductility by Controlling PFZ with Microalloying Elements in Al-Zn-Mg Alloys

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The effectiveness of microalloying addition and two-step aging on the mechanical properties of the Al-Zn-Mg alloy has been investigated using TEM, tensile test and nanoindentation. By decreasing width of PFZ and size of grain boundary precipitates through the addition of (Ag+Sn) or two-step aging process, tensile properties of Al-Zn-Mg alloys are markedly improved. The elongation was quantitatively related to the three microstructural factors; i.e. the width of PFZ, size of grain boundary precipitates and the level of proof stress, to predict ductility of the alloys with known microstructural factors. The fracture mode change is reasonably in terms of the hardness difference between grain interiors and PFZ region by a noindentation technique.

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Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

235-238

Citation:

T. Ogura et al., "Improvement of Strength and Ductility by Controlling PFZ with Microalloying Elements in Al-Zn-Mg Alloys", Materials Science Forum, Vols. 561-565, pp. 235-238, 2007

Online since:

October 2007

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$38.00

[1] For example; G. Thomas and J. Nutting: J. Inst. Metals, Vol. 88 (1959-60), p.81.

[2] T. Ogura, S. Hirosawa, A. Cerezo and T. Sato: Mater. Sci. Forum, Vol. 519-521 (2006), p.431.

[3] T. Ogura, S. Hirosawa and T. Sato:J. Japan Inst. of Light Metals, Vol. 56 (2006), p.644. A.Q. 101.

[10] [2] [10] [3] [0] [50] 100 150 200 Al-Zn-Mg ternary Ag-added Aging time, t / ks Hardness difference, Δ H / mgf/ µm2 Intergranular fracture Transgranular fracture Fig. 4 Relationship between hardness difference and aging time in the Al-Zn-Mg ternary and Ag-added alloys aged at 433K.

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