The influence of the type

addition of Al-5Ti-B refiner and refining process on the structure and mechanical properties of ZL205Aalloy was investigated by OM

SEM and tensile testing.When the TiB

2

phase in the Al-5Ti-B refiner is aggregated

the refinement effect can induce inhomogeneity.In addition

the coarse Al

3

Ti in the refiner will be resided in the alloy and greatly reduce the elongation.With Al-5Ti-B refiner of 0.25%

the refinement effect of ZL205Aalloy is desirable and the mechanical properties reach the satisfied values

where the yield strength

tensile strength and elongation reach 378MPa

455 MPa and 8.9%

respectively.With using C

2

Cl

6

purifying

the"toxic"reaction of Al-5Ti-B refiner can lead to the aggregation and deposition of TiB

2

particles.The stability of TiB

2

phase can be guaranteed by using Ar purifying and controlling the purifying time.