Abstract: In a method for preparing a gradient hardened titanium alloy. A steel momentum block and a cleaned titanium alloy plate are sequentially placed into a steel base with a through hole from bottom to top, a cross sectional size of the through hole is matched with cross sectional sizes 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. An explosive frame is fixed on a top edge of the steel base, a high explosion velocity explosive with an explosion velocity of 7000 m/s or more pressed into a plate-shaped structure is placed in the explosive frame, and detonation is caused at one end of a top surface of the explosive to perform impact treatment on the titanium alloy plate, thereby obtaining the gradient hardened titanium alloy.

Abstract: In a method for preparing a gradient hardened titanium alloy. A steel momentum block and a cleaned titanium alloy plate are sequentially placed into a steel base with a through hole from bottom to top, a cross sectional size of the through hole is matched with cross sectional sizes 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. An explosive frame is fixed on a top edge of the steel base, a high explosion velocity explosive with an explosion velocity of 7000 m/s or more pressed into a plate-shaped structure is placed in the explosive frame, and detonation is caused at one end of a top surface of the explosive to perform impact treatment on the titanium alloy plate, thereby obtaining the gradient hardened titanium alloy.

Abstract: Embodiments of the present disclosure provide a method for authorizing a virtual key, a server, and a non-transitory computer-readable storage medium. The method, implemented in a server, includes: receiving an authorization command sent from a first mobile terminal; after the identity information of the first mobile terminal passes verification, integrating the plurality of authorization function codes to generate a code set, and sending the code set to a second mobile terminal of a user to be authorized through the first mobile terminal; receiving identity information of the second mobile terminal and the code set sent from the second mobile terminal; and after the identity information of the second mobile terminal passes verification, generating virtual keys of the plurality of functions of the vehicle corresponding to the plurality of authorization function codes, and sending the virtual keys to the second mobile terminal.

Abstract: Embodiments of the present disclosure provide a method for authorizing a virtual key, a server, and a non-transitory computer-readable storage medium. The method, implemented in a server, includes: receiving an authorization command sent from a first mobile terminal; after the identity information of the first mobile terminal passes verification, integrating the plurality of authorization function codes to generate a code set, and sending the code set to a second mobile terminal of a user to be authorized through the first mobile terminal; receiving identity information of the second mobile terminal and the code set sent from the second mobile terminal; and after the identity information of the second mobile terminal passes verification, generating virtual keys of the plurality of functions of the vehicle corresponding to the plurality of authorization function codes, and sending the virtual keys to the second mobile terminal.