Abstract: A two-phase heat transfer apparatus for cooling electronics through an evaporation/condensation cycle, and an evaporator of a heat transfer apparatus are provided. The evaporator or apparatus includes multiple materials to leverage multiple beneficial material properties. A transition between the multiple materials is provided by use of explosion welding. A fluid-containing interior cavity is formed in the evaporator or apparatus such that cavity sidewalls include the transition, which is hermetically sealed due to the explosion weld. The use of multiple materials may be leveraged to incorporate features including a view glass or feed-through connector into the apparatus for viewing the working fluid or incorporating electrical components inside of the hermetic enclosure. In one embodiment, the apparatus base can be made of copper and the condenser can be made out of aluminum containing aluminum tubes, such as multiport tubes.