Nickel-based alloy refers to a class of alloys with high strength and certain antioxidant corrosion resistance at 650 ~ 1000℃. According to the main properties, it is subdivided into nickel-based heat resistant alloy, nickel-based corrosion resistant alloy, nickel-based wear resistant alloy, nickel-based precision alloy and nickel-based shape memory alloy. According to the different matrix, superalloy is divided into: iron based superalloy, nickel based superalloy and cobalt based superalloy. Nickel-based superalloy is referred to as nickel-based alloy.