Minimum Test load for Al alloys

[Hlengani]

What is the minimum test load to be used with Vickers tester to determine the hardness of Al alloys.

 

[CoryPad]

ASTM E 384 Standard Test Method for Microindentation Hardness of Materials allows a force as small as 1 gf (9.8 mN).

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[Hlengani]

but i am a bit worried about the effect of the test load to the hardness of the material. since the hardenss normally decreases with an increase in a test load. according to Dieter the minimum test load is 300gf and above this the hardness of the material should remain constant.

 

[metengr]

A Brinell hardness test would be more effective for bulk hardness, unless you have a specific reason to use Vickers.

 

[CoryPad]

Without more information regarding what you are attempting, you won't get helpful tips. Background information like alloy, mechanical properties, microstructure, part/sample size, etc. will allow others to provide you with helpful tips.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[Hlengani]

The alloy i want to test is AA5754