One cracking Ti2AlNb powder metallurgy near net shape forming component after solution heat treatment is analyzed in this paper. Slight capsule gas leakage during hot isostatic pressing (HIPing) has been investigated

the results show that the high-temperature and high-pressure argon during the hot isostatic pressing is introduced into the capsule. Argon will not be dissolved or be absorbed within titanium alloy and the argon existed in the form of uncombined element in titanium alloys causing pore defects which are harmful for the mechanical properties of the material. These pores are expanded to form temperature induced pores (TIP pores) during heat treatment

and this usually results in damage to the mechanical properties of the material

which may also cause cracking of the material. Ti2AlNb alloys belong to brittle materials

which are sensitive to notches. Once cracks are formed

they propagate rapidly and then cause cracking.