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Titanium and Titanium Alloy Specimen Preparation
(Class 6 Procedures)

Metallographic Class 6 sample preparation


Titanium alloys are very useful because they have a good strength to weight ratio. This makes them idea for use in areas ranging from areospace to sports equipment. Preparation of titanium and titanium alloys is fairly straight forward by conventional metallographic techniques.

For final polishing a method known as Attack Polishing using a combination of colloidal silica and hydrogen peroxide combined with Kroll's reagent has been demonstrated to produce an excellent final metallographic surface finish for titanium and titanium alloys

SECTIONING

MAXCUT Abrasive blade (Cat. No. MAX-C or MAX-I series)

MOUNTING

Compression Mounting with Phenolic, Epoxy or Diallyl Phthalate compression mounting resins

POLISHING

Abrasive/surface

Lubricant

Force/ sample

Speed
(Head/base)

Time

240 grit SiC paper
360 grit SiC paper
600 grit SiC paper
800 grit SiC paper
1200 grit SiC paper

Water

5-10 lbs

200/200 rpm

Until plane
1 minute
1 minute
1 minute
1 minute

6 um DIAMAT diamond on TEXPAN polishing pad

DIALUBE Purple Extender

5-10 lbs

200/200 rpm

3 minutes

1 um DIAMAT diamond on GOLDPAD polishing pad

DIALUBE Purple Extender

5-10 lbs

200/200 rpm

2 minutes

Titanium Attack mixed with Kroll's reagent on MICROPAD polishing pad

 

5-10 lbs

100/100 rpm

5-10 minutes


Metallographic micrograph of Titanium Ti6Al4V alloy

Ti6Al4V titanium alloy, 400X (DIC), etched

Cast titanium microsctructure

Cast Titanium, 200X (BF), Etchant Kroll’s Reagent.

Wrought titanium microstructure

Wrought Titanium, 200X (BF), Etchant Ammonium Bifluoride.

Alpha-rich wrought titanium microstructure

Alpha-rich Case Wrought Titanium, 200X (BF).

ETCHING

Common Etchants
PACE Technologies Recommended Etchants

PACE Technologies Etchant Database

CAUTION:Safety is very important when etching. Be sure to wear the appropriate protective clothing and observe all WARNINGS on chemical manufacuters SDS (Safety Data Sheets). Also review the COMMENTS and CONDITIONS Section for each etchant.


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email: pace@metallographic.com
www.metallographic.com


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