Composing material member and method for producing the same

A composite material member comprising:

• a main material composed of a light metal or a light metal alloy which can be molded by casting;
• and
• a secondary material composed of a metallic material different from the main material or an inorganic material, the secondary material being joined to the main material by integrally casting with the main material,
• wherein a porous material is arranged on a part of a boundary area or an entire boundary area between the main material and the secondary material,
• wherein the light metal is aluminum or magnesium, and the light metal alloy is an alloy including at least one of aluminum and magnesium,
• wherein the secondary material is cast iron, iron steel, stainless steel, Fe—Cr-based alloy, or Ni-based alloy,
• and wherein the porous material is composed of a metal fiber and a foamed metal by which a diffusion joining can be performed with the secondary material.

A method for producing a composite material member comprising the steps of:

• preparing a main material composed of a light metal or a light metal alloy which can be molded by casting, and a secondary material composed of a metallic material different from the main material or an inorganic material;
• and
• joining the secondary material to the main material by integrally casting the materials;
• wherein a porous material is contacted with the secondary material, the porous material and the secondary material are compressed at a predetermined volume rate and sintered in the contacted condition to join them by diffusion and obtaining a compact, and the compact is joined to the main material by integrally casting them.

A method for producing a composite material member comprising the steps of:

• preparing a main material composed of a light metal or a light metal alloy which can be molded by casting, and a secondary material composed of a metallic material different from the main material or an inorganic material;
• and
• joining the secondary material to the main material by integrally casting the materials;
• wherein a porous material composed of a fiber is preliminarily compressed at a predetermined volume rate, the compressed fiber and the secondary material are sintered, thereby joining them by diffusion and obtaining a compact, and the compact is joined to the main material by integrally casting them.