Aging Behavior of Ultrafine-Grained Al-Mg-Si-X (X = Cu, Ag, Pt, Pd) Alloys Produced by High-Pressure Torsion

被引：5

作者：

Akama, Daichi ^{[1
]}

Lee, Seungwon ^{[1
,2
]}

Horita, Zenji ^{[1
,2
]}

Matsuda, Kenji ^{[3
]}

Hirosawa, Shoichi ^{[4
]}

机构：

[1] Kyushu Univ, Dept Mat Sci & Engn, Fac Engn, Fukuoka 8190395, Japan

[2] Kyushu Univ, WPI, Int Inst Carbon Neutral Energy Res I2CNER, Fukuoka 8190395, Japan

[3] Toyama Univ, Grad Sch Sci & Engn Res, Toyama 9308555, Japan

[4] Yokohama Natl Univ, Dept Mech Engn & Mat Sci, Yokohama, Kanagawa 2408501, Japan

来源：

MATERIALS TRANSACTIONS | 2014年 / 55卷 / 04期

基金：

日本科学技术振兴机构;

关键词：

high-pressure torsion; grain refinement; precipitation hardening; aluminum-magnesium-silicon alloy; transmission electron microscopy; MICROALLOYING ELEMENTS; PHASE; DUCTILITY; STRENGTH;

D O I：

10.2320/matertrans.L-M2014802

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Age-hardenable Al-Mg-Si alloys containing additional elements of Ag, Cu, Pt or Pd were processed by high-pressure torsion (H PT) and they were subsequently aged at a temperature of 373 K for up to a total period of 5,400 ks. It was found that, in all alloys, the grain sizes after HPT were refined to 300-430 nm and there were significant increases in the hardness through the HPT processing. The hardness was further increased by the subsequent aging treatment, confirming the simultaneous strengthening by grain refinement and fine precipitation. However, the aging behavior was different depending on the alloying elements. In the Cu-added excess Mg alloy, the hardness increase was large and the higher hardness retained for longer aging time when compared with those of non-added alloys. It was suggested that the precipitation of a few particles within a single grain with the size of a few hundred nanometer contributes to appreciable age hardening.

引用

页码：640 / 645

页数：6

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