Preparation method for titanium-nickel memory alloy sheet

Abstract

The invention belongs to the field of nonferrous metal processing, and provides a preparation method for a titanium-nickel memory alloy sheet. The preparation method mainly comprises the steps of smelting, annealing, forging, hot rolling, cold rolling and annealing, acid pickling and inspection; a vacuum induction furnace graphite crucible is adopted for smelting in the smelting step, firstly, a small amount of Ti-Ni mother alloys with the same mass percent as smelting materials is prepared and is placed in the vacuum induction furnace graphite crucible, after power is supplied and smelting iscompleted, a Ti-Ni alloy molten pool is formed, melting the ni alloy molten pool, then crushed materials of sponge titanium and electrolytic nickel are slowly added into the molten pool for smelting,and a titanium-nickel ingot is formed, wherein the chemical components of the titanium-nickel ingot is ensured to comprise 54.5%-55.5% of Ni, less than or equal to 0.04% of C, less than or equal to 0.005% of H, less than or equal to 0.050% of O, less than or equal to 0.04% of N and the balance Ti. According to the method, the problem of poor plasticity of a common titanium-nickel memory alloy sheet at the room temperature is solved, defects of cracking, peeling, folding, oxidizing and impurity pressing are overcome, the mechanical property is improved, meanwhile, the cost is reduced, and theyield during batch production is improved.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal processing, and relates to a preparation method of a titanium-nickel memory alloy thin plate. Background technique [0002] Shape memory alloy (ShapeMemoryAlloy, referred to as SMA) is a new type of functional material, which has a unique shape memory effect (ShapeMemory Effect, referred to as SME). The deformed shape. But when the temperature rises to a certain temperature, the material will automatically return to the shape before deformation. SME can be considered to be discovered by Olander in 1932 when he was studying Au-Cd alloy. Thirty years later, W1J1Buehler of the U.S. Naval Weapons Laboratory found that when the Ti-Ni alloy workpiece was knocked, the sound was different due to the different ambient temperatures, and through many experiments and studies, it was confirmed that the Ti2Ni alloy with nearly equiatomic ratio has good SMEs. With the deepening of research, research...

AI Technical Summary

Problems solved by technology

[0003] Generally, different titanium-nickel alloy compositions, different heat treatment processes, and different processing states have an important influence on the SE characteristics of Ti-Ni alloys, and the processing difficulty is high.

In practice, the processing of titanium-nickel alloy sheets or foils is even more difficult. At present, titanium-nickel alloy thin sheets have fatal defects of poor room temperature plasticity and poor surface finish.

In addition, in the process of processing, there will be defects such as cracks, peeling, folding, oxidation and impurity intrusion. High-quality titanium-nickel alloy plates or foils are difficult to process and the yield is very low.

The current production process cannot effectively overcome these defects, and it is difficult to produce in batches