TY - JOUR

T1 - Influence of Zn and Sn on the Precipitation Behavior of New Al–Mg–Si Alloys

AU - Glöckel, Felix

AU - Uggowitzer, Peter J.

AU - Felfer, Peter

AU - Pogatscher, Stefan

AU - Höppel, Heinz Werner

PY - 2019/8/10

Y1 - 2019/8/10

N2 - In this study, we demonstrate how Zn and Sn influence hardening behavior and cluster formation during pre-aging and paint bake treatment in Al-Mg-Si alloys via hardness tests, tensile tests, and atom probe tomography. Compared to the standard alloy, the Sn-modified variant shows reduced cluster size and yield strength in the pre-aged condition. During the paint bake cycle, the clusters start to grow very fast and the alloy exhibits the highest strength increment. This behavior is attributed to the high vacancy binding energy of Sn. Adding Zn increases the formation kinetics and the size of Mg-Si co-clusters, generating higher yield strength values for both the pre-aged and paint baked conditions. Simultaneous addition of Zn and Sn creates a synergistic effect and produces an alloy that exhibits moderate strength (and good formability) in the pre-aged condition and accelerated hardening behavior during the paint bake cycle.

AB - In this study, we demonstrate how Zn and Sn influence hardening behavior and cluster formation during pre-aging and paint bake treatment in Al-Mg-Si alloys via hardness tests, tensile tests, and atom probe tomography. Compared to the standard alloy, the Sn-modified variant shows reduced cluster size and yield strength in the pre-aged condition. During the paint bake cycle, the clusters start to grow very fast and the alloy exhibits the highest strength increment. This behavior is attributed to the high vacancy binding energy of Sn. Adding Zn increases the formation kinetics and the size of Mg-Si co-clusters, generating higher yield strength values for both the pre-aged and paint baked conditions. Simultaneous addition of Zn and Sn creates a synergistic effect and produces an alloy that exhibits moderate strength (and good formability) in the pre-aged condition and accelerated hardening behavior during the paint bake cycle.

KW - Al-Mg-Si alloy

KW - Al-Mg-Si-Zn-Sn alloys

KW - Cluster formation

KW - Hardening behavior

KW - Paint bake

KW - Sn

KW - Zn

UR - http://www.scopus.com/inward/record.url?scp=85070556984&partnerID=8YFLogxK

U2 - 10.3390/ma12162547

DO - 10.3390/ma12162547

M3 - Article

AN - SCOPUS:85070556984

VL - 12.2019

JO - Materials

JF - Materials

SN - 1996-1944

IS - 16

M1 - 2547

ER -