True or false

1) Hot working an aluminum alloy results in finer grain size that cold working it.

2) Hot working a steel alloy can result in finer grain size than its parent material

3) The precipitates (inter-metallic phase) formed in aluminum alloys during aging is responsible for the alloy’s ability to strengthen by the aging treatment.

4) The crystal structure of steel changes fromBCC to FCC upon crossing the austenization temperature when heating the alloy

5) The crystal structure of steel changes from BCC to FCC upon crossing the austenization temperature when cooling the alloy

6) Martensite is typically tempered to increase its ductility

7) Some aluminum alloys can be aged at ambient temperature, while other aluminum alloys require aging temperatures inexcess of 750°C.

8) Quenched aluminum 2024, after sufficient time above the solution temperature, is a supersaturated solution of Mg in Al.

9) Quenched steel is usually in the form of austenite

10) Quenching strengthens steels, but not aluminum alloys.