| 摘要 |
An automotive trim material to be detachably mounted on a painted steel automotive body by means of clips secured to the body is shown to comprise a composite metal laminate material having an outer layer of stainless steel disposed exteriorly of the trim configuration, an intermediate layer of mild steel material, and an opposite outer surface layer of aluminum material, said laminate layer materials being metallurgically bonded together in the solid phase, the stainless steel layer being in scratch-resistant, cold-worked condition, the mild steel layer being in easily formed, annealed condition, and the interface between the mild steel and the aluminum layers being substantially free of embrittling aluminum-iron intermetallic compounds. The composite metal laminate material is formed by roll-squeezing layers of selected metal materials together with reduction in the thicknesses thereof at a temperature below the temperature at which a liquid phase of the layer materials is formed and below a temperature at which intermetallic compounds of aluminum-iron are formed, thereby metallurgically bonding the layers together and cold-working the layer materials. The resulting bonded composite material is then heated to a selected temperature which is above the recrystallization temperature of said mild steel material, which is below the recrystallization temperature of said stainless steel material, and which is below the temperature at which any substantial amount of aluminum-iron intermetallic compound is formed at the bonded interface between the mild steel and aluminum materials of the laminate.
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