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The ZK60A is used where high strength and good toughness are required. This alloy is heat treatable and is normal used in the artificially aged (T5) condition. Alloy ZK60A has essentially the same strength as AZ80A but with greater ductility. To develop maximum properties, both AZ80A and ZK60A are heat treated to the artificially aged (T5) condition; AZ80A may be given the T6 solution heat treatment, followed by artificial aging to provide maximum creep stability. Typical uses include extruded products and press forgings with high strength and good ductility.
| Weight % | Zn | Zr | Other (total) | Mg |
|---|---|---|---|---|
| minimum | 4.80 | 0.45 | — | Bal |
| maximum | 6.20 | — | 0.30 |
| Characteristics | English | Metric | ||
|---|---|---|---|---|
| Nominal density | 25°C / 78°F | 0.066 lbs/in3 | 1.83 g/cm3 | |
| Specific heat | Cp=0.1233+0.0002566T+3939T2 | |||
| Incipient melting | >=965 °F | >=518 °C | ||
| Coefficient of thermal
expansion |
20°C / 68°F | 14 micro in/in- °F | 26 micro m/m- °K | |
| Thermal conductivity | F temper
20°C (68°F) |
68 BTU/ft- hr – °F | 117 W/m – °K | |
| T5 temper
20°C (68°F) |
70 BTU/ft- hr – °F | 121 W/m – °K | ||
| Electrical conductivity | F temper
20°C (68°F) |
29 %IACS | ||
| T5 temper
20°C (68°F) |
30 %IACS | |||
| Condition | Tensile | Hardness | Shear strength | |||||
|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation in
50 mm (2 in.) |
Brinell
500 kg load, 10 mm ball |
|||||
| KSI | MPa | KSI | MPa | % | KSI | Mpa | ||
| F temper | 49 | 340 | 38 | 260 | 11 | 75 | 27 | 185 |
| T5 temper | 51 | 350 | 41 | 285 | 11 | 82 | 26 | 180 |
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