Titanium / alpha beta General Questions

Question 1

How does the crystalline structrues of the a alloys, b alloys of Ti differ? What can cause a structure to convert from an alpha phase to a beta phase?

Answer 1

Alpha alloys display a HCP structure and beta alloys show a BCC. A transition temperature of 882C induces this change.

Question 2

What are alpha/beta Ti alloys? How can they form?

Answer 2

Alpha/Beta Ti alloys contain both the alpha and beta phases. They can form if alloyed with beta stabilisers or alpha stabilisers after a certain concentration and temperature.

Question 3

What is the strengthening mechanism within meta-stable beta alloys?

Answer 3

Ageing metastable beta phase to produce some alpha phase. (Ageing causes precipitation of fine α phase (dispersion strengthening)).

Question 4

How are B stable alloys formed and what property has changed to induce this?

Answer 4

Increasing the content of beta stabilising elements causes the Beta tansus temperature to decreased below RT. After cooling to room temperature, beta phase remains stable.