BI-MATERIAL JOINT FOR ENGINE

An engine bi-material joint (50) includes a first flange (48) composed of a first material defining a first coefficient of thermal expansion, and a second flange (38) composed of a second material defining a second coefficient of thermal expansion. The second material is different from the first material. An interface flange (58) is engaged with the first flange (48) and with the second flange (38). The interface flange (58) material defines a third coefficient of thermal expansion being equal to or less than the first coefficient of thermal expansion and less than the second coefficient of thermal expansion. The first coefficient of thermal expansion is less than the second coefficient of thermal expansion.