Study on Ductility of Ti Aluminide Using Artificial Neural Network

Table 2

Parameters, its detail characteristics, and ductility values.

Parameters	Detail characteristics	Ductility (%e)	Digital data form
Alloy type	(1) Binary alloy (Ti-48Al at%) [5, 6, 28]	2.1	1
	(2) Multicomponent alloy (Ti-48Al + 0–4 M*) [9, 11]	3.0	2
Grain size	(1) 10 μm [29, 31]	2.0	1
	(2) 50 μm [29, 31]	1.8	2
	(3) 100 μm [32]	1.4	3
	(4) 250 μm [32]	1.1	4
Heat treatment cycles	(1) Above 𝑇α (2 hrs) then FC to RT [32]	0.5	1
	(2) Just below 𝑇α (20 min.) then AC to RT [11]	1.5	2
	(3) Below 𝑇α (100°C) soaking (2 hrs) then AC to RT [11]	3.6	3
	(4) Above 𝑇α (1 hr) then CC1 to below Te (soaking for 6 hrs) then AC to RT [8]	0.8	4
	(5) Just above 𝑇α (30 min) then CC2 to RT + heating below Te and soaking for 6 hrs then AC to RT [8]	2.8	5
	(6) Just below 𝑇α (3 hrs.) then CC1 to below Te (soaking for 4 hrs) then AC to RT [8]	3.8	6
	(7) Soaking just below 𝑇α for 4 hrs then FC to (𝑇α-50°C) and soaking for 4 hrs then FC to RT + heating and soaking below Te (24 hrs) then AC to RT [33]	5.0	7

M* is alloying elements (Cr/ Mn/V at the desired content ranging from 0–4 at%, leading to maximum ductility). Tα (α transus temperature for specific alloy), RT (room temperature), FC (furnace cooling), AC (air cooling), CC1 (controlled cooling 80°C/min), CC2 (controlled cooling 100°C/min), and Te (eutectoid temperature of alloy).