A method for preparing a shear-assisted extruded material from a powder billet is provided, the method comprising providing a billet of material in substantially powder form; applying both axial and rotational pressure to the material to deform at least some of the contacted material; and extruding the material to form an extruded material. A method for preparing shear-assisted extruded material is provided, the method comprising applying both axial and rotational pressure to stock material to form an extruded material at a rate between 2 and 13 m/min. A method for preparing shear-assisted extruded material is provided. The method comprises applying both axial and rotational pressure to stock material to form an extruded material; and aging the extruded material for less than 3 hours. A method for preparing shear-assisted extruded material is provided. The method comprises providing a stock material for shear-assisted extrusion; and applying both axial and rotational force to the stock material to form an extruded material, wherein the axial force does not decrease during the extrusion.

An evaporator includes a housing, a first heat exchange tube set, a second heat exchange tube set, a first side heat exchange tube baffle device, a second side heat exchange tube baffle device, and a redistribution device. The first heat exchange tube set is located above the second heat exchange tube set. The first side heat exchange tube baffle device and the second side heat exchange tube baffle device are arranged along the outer contours of the first heat exchange tube set and the second heat exchange tube set, so as to guide a refrigerant to flow from the first heat exchange tube set to the second heat exchange tube set. The redistribution device is disposed between the first heat exchange tube set and the second heat exchange tube set to evenly distribute the refrigerant to the second heat exchange tube set.