Surface Hardening of Ti-15V-3Al-3Cr-3Sn Alloy after Cyclic Hydrogenation and Subsequent Solution Treatment

Table 3

Process designations and the associated processing parameters.

Process designations	The associated processing parameters
T1	Heating for 2 hrs at 300°C and then air cooling to room temperature
Tn	Specimens heated for 𝑛 times followed the T1 conditions (𝑛≧2)
H1	Hydrogenated at 50 mA/cm^2 for 1 hr in 1N H2SO4(aq) + 0.1 g/L As2O3
L1	Hydrogenated at 5 mA/cm^2 for 10 hrs in 1N H2SO4(aq) + 0.1 g/L As2O3
H1T1	H1 treated specimens followed by a further T1 treatment
T1H2	H1T1 treated specimens followed by a further H1 treatment
HnTn	Tn-1Hn treated specimens followed by a further T1 treatment (𝑛≧2)
TnHn + 1	HnTn treated specimens followed by a further H1 treatment (𝑛≧2)
L1T1	L1 treated specimens followed by a further T1 treatment
T1L2	L1T1 treated specimens followed by a further L1 treatment
LnTn	Tn-1Ln treated specimens followed by a further T1 treatment (𝑛≧2)
TnLn + 1	LnTn treated specimens followed by a further L1 treatment (𝑛≧2)