Encyclopedie de la recherche sur l'aluminium au Quebec - Edition 2014 | Page 62

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TRANSFORMATION ET APPLICATIONS // TRANSFORMATION AND APPLICATIONS
Improving the Age-Hardening Ability of AA2219
DCDURCISSEMENT DES PLAQUES COULÉES Treatment
AMÉLIORER LA CAPACITÉ DE Cast Plates Using Two-Step Aging
D'ALLIAGE AA2219 UTILISANT DE VIEILLISSEMENT EN DEUX ÉTAPES
Améliorer la capacité de durcissement des plaques coulées
d’alliage AA2219 utilisant DC
AGE-HARDENING ABILITY OF AA2219de vieillissement en deux étapes

IMPROVING THE
CAST PLATES USING TWO-STEP AGING TREATMENT

E.M. Elgallad1, Z. Zhang1, P. Shen2, J.-L. Bernier2, X.-G. Chen1
1NSERC/Rio Tinto Alcan Industrial Research Chair
in Metallurgy of Innovative Aluminum Transformation (CIMTAL)
UQAC, Saguenay (QC), Canada G7H 2B1
2PCP Canada, Saguenay (QC), Canada G7B 3N8

INTRODUCTION

RESULTS
(a)

Direct chill (DC) cast aluminum plates have been
increasingly used in large mold applications in
the automotive and plastics industries. These
plates are usually air quenched to avoid the
severe residual stress that can be induced by
water quenching, as this stress negatively affects
their machining behavior and dimensional
stability. With its combination of high specific
strength, good machinability and excellent
weldability, AA2219 DC cast alloy has become a
new category of cast plate materials. On the
other hand, it is one of the most quench-sensitive
alloys, losing its ability to develop high strength
with decreasing the quench rate from the
solutionizing temperature.

(a)

(b)

A

Endoth.

E
A1
D

0.01 W/g
C

Fig. 1 (a) TEM image and (b) corresponding SADP obtained near
the [001]α zone axis from A1 sample.
(a)

W1

D

Exoth.

Normalized Heat Flow

E

C

(b)
60

100

140

180

220

260

300

340

380

420

460

500

540

Temperature (ºC)
(b)

0.01 W/g

E

B

W2

(a)

(b)

OBJECTIVES

E

Endoth.

B

A2

D

B

E

C
C

A

Exoth.

Fig. 2 TEM images obtained from: (a) W2 and (b) A2 samples.

Normalized Heat Flow

D

D

A3
E

C

D

A4

C

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