Valve assembly for an injection valve

A valve assembly (11) for an injection valve (10) is provided, comprising a valve body (14) comprising a cavity (18), a valve needle (20) axially movable in the cavity (18) and an electro-magnetic actuator (36) unit being designed to actuate the valve needle (20). The electro-magnetic actuator unit (36) comprises a pole piece (21) being fixedly coupled with respect to the valve body (14) and an armature part (22) being axially moveable with respect to the valve body (14), wherein the pole piece (21) comprises a first contact surface (51) and the armature part comprises a second contact surface (52), wherein the pole piece (21) and the armature part (22) are configured to collide with each other at the respective contact surfaces (51, 52). The pole piece (21) and the second armature part (22) comprise at least two different metal materials (25a, 25b), wherein one of the metal materials has a higher hardness than the at least one other metal material, and wherein the harder metal material (25b) is located at least in a first section of the first contact surface (51) and a second section of the second contact surface (52), and wherein the harder metal material (25b) located at the first section of the first contact surface (51) at least partially overlaps with the harder metal material (25b) located at the second section of the second contact surface (52) in a radial direction with respect to a central longitudinal axis (L) of the valve assembly (11).