Precipitation behavior of T′ metastable phase in Al-Zn-Mg based alloys

被引：0

作者：

Adachi, H ^{[1
]}

Osamura, K ^{[1
]}

Okuda, H ^{[1
]}

Yokoe, K ^{[1
]}

Kusui, J ^{[1
]}

机构：

[1] Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan

来源：

JAPAN INSTITUTE OF METALS, PROCEEDINGS, VOL 12, (JIMIC-3), PTS 1 AND 2: SOLID - SOLID PHASE TRANSFORMATIONS | 1999年

关键词：

aluminium alloy; metastable phase; Vickers hardness; SAXS; DSC;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recently super-high strength alloys have been developed in Al-Zn-Mg based alloys. The major phase contributing the strength was suggested to be T' metastable phase by preliminary experiments. Here we report the details about precipitation behavior of T' metastable phase. The Vickers hardness test, SAXS measurement and DSC measurement were carried out for the specimens with different Zn/Mg ratio aged at 383 similar to 423K for various times. The highest Vickers hardness was 269 for the specimen with effective Zn/Mg=0.49, aged at 383K for 108ks. On the basis of the phase diagram and the results of DSC measurement, the region of three different kinds of metastable phase,T',eta' and beta' has been determined. From the SAXS measurement, the radius and the interparticle distance of metastable phase are found to increase monotonously by aging. The finer and denser T' precipitates grew comparing with other phases for the peak aging condition. The volume fraction tended to increase with increasing aging temperature. The electron density difference between the matrix and the T' precipitates became small.

引用

页码：269 / 272

页数：4

共 3 条

[1] Development of super-high strength Al-Zn-Mg-Cu P/M alloys [J].

Kusul, J ;

Fujii, K ;

Yokoe, K ;

Yokote, T ;

Osamura, K ;

Kubota, O ;

Okuda, H .

ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 1996, 217 :1823-1828

[2]

MONDOLFO LF, 1956, T AM I MIN MET ENG, V206, P1378

[3] Mesoscopic structure of super-high strength P/M Al-Zn-Mg-Cu alloys [J].

Osamura, K ;

Kohno, K ;

Okuda, H ;

Ochiai, S ;

Kusui, J ;

Fujii, K ;

Yokoe, K ;

Yokote, T ;

Hono, K .

ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 1996, 217 :1829-1834

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