Table 1 Volume fraction, nanohardness and Young’s modulus of the phases in coarse and fine precipitate regions

From: Hybrid nanostructured aluminum alloy with super-high strength

Phases

Volume fraction (%)

Nanohardness (GPa)

Young’s modulus (GPa)

In fine precipitate region

 

7.0±0.5

148.3±9.0

 fcc-Al

21±3

1.3±0.1

74±6

 Al19Gd3Ni5

19.5±5

5.9±0.5

185±4

 Al9Co2

—

9±0.8

181±10

 Al3Gd

—

6±0.2

121±2

 Al9Co2-Al3Gd

59.5±5

6–9

121–181

According to mixture law

 

4.9–6.78

124–159

In coarse precipitate region

 

5.4±0.4

146.8±4.8

 fcc-Al

23.6±3

1.3±0.1

74±6

 Al19Gd3Ni5

59.9±3

5.9±0.5

185±4

 Al9Co2

—

9±0.8

181±10

 Al3Gd

—

6±0.2

121±2

 Al9Co2-Al3Gd

16.5±5

6–9

121–181

According to mixture law

 

4.83–5.33

148–158

  1. Nanohardness and Young’s modulus in this table are obtained from nanoindentation. Because Al9Co2 and Al3Gd always mix together in the microstructure, to facilitate easier calculation, they are taken as one phase and labeled as Al9Co2-Al3Gd phase. Al9Co2-Al3Gd phase then has minimum and maximum values for Young’s modulus nanohardness.
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