MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Microstructural Evolution through Uniaxial Hot Pressing before Age Hardening of AZ91D Alloy
Naoki KitazonoDaishi SuzukiRintaro YamaguchiKeisuke MitsuishiKoichi Kitazono
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2016 Volume 57 Issue 7 Pages 1094-1100

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Abstract

In recent years, magnesium alloys are attracting attention from aircraft and automotive industries because of their low density, high specific strength and high damping capacity. However, magnesium alloys suffer from low ductility at room temperature. The improvement of ductility in AZ91D alloy through a new thermo-mechanical treatment (TMT) process was reported. This TMT process is based on simple uniaxial hot pressing in atmosphere. Uniaxial hot pressing was carried out at 673 K up to 67% compressive strain. After the hot pressing, the specimen was held isothermally at 673 K for various times. Hot pressed specimens were aged at 473 K. The specimen isothermally held for 3.6 ks showed tensile strength of 358 MPa and elongation to failure of 9.6%. Microstructural observation revealed that both high strength and ductility in AZ91D alloy were caused by the homogeneous distribution of fine intermetallic precipitates inside grains.

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© 2016 The Japan Institute of Light Metals
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