NiMnFeGaAl-RE series magnetostriction material and preparation method thereof

The invention relates to an NiMnFeGaAl-RE series magnetostriction material and a preparation method thereof. The material components of the magnetostriction material comprises Ni, Mn, Fe, Ga, Al and RE, the element atom ratio of Ni:Mn:Fe:Ga:Al:RE in an alloy is 5-20:5-30:40-60:18-25:0.01-2, and the RE is one or two of La, Ce, Pr, Nd, Tb, Dy and Y. The magnetostriction material enables refined alloy rods to undergo crystal orientated growth through a high-temperature gradient rapid freezing method to obtain (100) and (110) structured oriented polycrystalline materials. The magnetostriction strain of the magnetostriction material linearly increases with the increase of a magnetic field under a low field (below 1500Oe), can be characterized by a linear function, and has no hysteresis, so the above characteristic enables the design of a sensor to be simplified; and the magnetostriction material has the advantages of low cost, good machining properties, and simple preparation technology.