Method for preparing gradient hardened titanium alloy

A method for preparing a gradient hardened titanium alloy, comprising:

• placing a steel base on a pre-paved sandpile;
• wherein the steel base is provided with a through hole;
• putting a steel momentum block and a cleaned titanium alloy plate into the through hole sequentially from bottom to top, thereby making the steel momentum block be located on a bottom of the through hole and a bottom surface of the steel momentum block be flush with a bottom surface of the steel base, and making the cleaned titanium alloy plate be located on a top surface opposite to the bottom surface of the steel momentum block;
• wherein a size of a cross section of the through hole is matched with sizes of cross sections of the steel momentum block and the titanium alloy plate, and a height of the through hole is matched with a total thickness of the steel momentum block and the titanium alloy plate;
• fixing an explosive frame on an edge of a top surface of the steel base;
• wherein the explosive frame is in contact with the cleaned titanium alloy plate, and the cleaned titanium alloy plate is located between the explosive frame and the steel momentum block;
• placing high explosion velocity explosive with an explosion velocity of equal to or greater than 7000 m/s and pressed into a plate-shaped structure in the explosive frame;
• and
• detonating from an end of a top surface of the explosive to perform impact treatment on the titanium alloy plate to thereby obtain the gradient hardened titanium alloy;
• wherein a ratio of a thickness of the titanium alloy plate:
• a thickness of the steel momentum block:
• a thickness of the high explosion velocity explosive:
• a horizontal distance between a side of the steel base close to an explosive detonation position and the titanium alloy plate:
• a distance between a side of the steel base far away from the explosive detonation position and the titanium alloy plate is 10-50:5-10:3-5:50-80:10-20.