Heat-resisting high-strength Al-alloy and method for manufacturing a structural member made of the same alloy

Claim 1

Heat-resisting high-strength Al-alloy consisting essentially of Mn and/or Zn besides Si, Fe, Cu, Mg and Li in the following range of chemical composition, the remainder consisting of an inevitable impurity and Al: 8.0≦Si≦30.0 wt%, 20≦Fe≦33.0 wt%, 0.8≦Cu≦7.5 wt%, 0.3≦Mg≦3.5 wt%, 1.0≦Li≦5.0 wt%, and 0.5≦Mn≦5.0 wt%, and/or 0.5≦Zn≦10.0 wt%.

Claim 3

A method for manufacturing a structural member made of a heat-resisting, high-strength sintered Al-alloy, comprising the steps of: providing a molten Al-alloy consisting essentially of: 8.0≦Si≦30 wt.%, 2.0≦Fe≦33.0 wt.%, 0.8≦Cu≦7.5 wt.%, 0.3≦Mg≦3.5 wt.%, 1.0≦Li≦5.0 wt.%, and 0.5≦Mn≦5.0 wt.%, and/or 0.5≦Zn≦10.0 wt.%, the remaining being Al and inevitable impurities; quenching and solidifying said molten Al-alloy at a cooling speed of 10 3 °C./sec or higher to obtain an Al-alloy powder; press-shaping said Al-alloy powder at a temperture of 350° C. or lower and at a shaping pressure of 1.5 to 5.0 ton/cm 2 to obtain a raw material for extrusion having a density ratio of 70% or higher; extruding said raw material for extrusion at a temperature of 300° to 400° C. and at an extrusion ratio of 5 or higher to obtain a raw material for forging; charging said raw material for forging into a metal mold that has been pre-heated to a temperature of 150° C. to 450° C.; forge-shaping said raw material for forging in said metal mold at a temperature of 300° to 495° C. to obtain a forge-shaped body; and cooling the forge-shaped body.

Claim 4

A method for manufacturing a structural member made of a heat-resisting, high-strength sintered Al-alloy, comprising the steps of: providing a molten Al-alloy consisting essentially of: 8.0≦Si≦30 wt.%, 2.0≦Fe≦33.0 wt.%, 0.8≦Cu≦7.5 wt.%, 0.3≦Mg≦3.5 wt.%, 1.0≦Li≦5.0 wt.%, and 0.5≦Mn≦5.0 wt.%, and/or 0.5≦Zn≦10.0 wt.%, the remaining being Al and inevitable impurities; quenching and solidifying said molten Al-alloy at a cooling speed of 10 3 °C./sec or higher to obtain an Al-alloy powder; press-shaping said Al-alloy powder at a temperture of 350° C. or lower and at a shaping pressure of 1.5 to 5.0 ton/cm 2 to obtain a raw material for extrusion having a density ratio of 70% or higher; extruding said raw material for extrusion at a temperature of 300° to 400° C. and at an extrusion ratio of 5 or higher to obtain a raw material for forging; charging said raw material for forging into a metal mold that has been pre-heated to a temperature of 150° C. to 450° C.; forge-shaping said raw material for forging in said metal mold at a temperature of 300° to 495° C. to obtain a forge-shaped body; and cooling the forge-shaped body.