Die-cast component, body component having said die-cast component, motor vehicle having said body component, and method for producing said die-cast component

Abstract

A method for producing a die-cast component and a die-cast component that is produced therewith. According to the invention, an outstanding punch riveting suitability is achieved if the die-cast component has a temperable aluminum alloy with the following alloying components: from 5.0 to 9.0 wt % silicon (Si), from 0.25 to 0.5 wt % magnesium (Mg), and residual aluminum as well as inevitable production-related impurities, containing at most 0.05 wt % of each and at most 0.15 wt % collectively, wherein the die-cast component has a yield strength (Rp0.2) of greater than 190 MPa and an elongation at break (A5) of greater than or equal to 7% and the uniform elongation (Ag) and necking elongation (Az) satisfy the condition Az≥Ag/2.

1 . A die-cast component made of a temperable aluminum alloy comprising the following alloy components:
 from 5.0 to 9.0 wt % silicon (Si),   from 0.25 to 0.5 wt % magnesium (Mg),   and optionally   up to 0.8 wt % manganese (Mn),   from 0.08 to 0.35 wt % zinc (Zn),   from 0.08 to 0.35 wt % chromium (Cr),   up to 0.30 wt % zirconium (Zr),   up to 0.25 wt % iron (Fe),   up to 0.15 wt % titanium (Ti),   up to 0.20 wt % copper (Cu),   up to 0.025 wt % strontium (Sr),   up to 0.2 wt % vanadium (V),   up to 0.2 wt % molybdenum (Mo)   and residual aluminum as well as inevitable production-related impurities, containing at most 0.05 wt % of each and at most 0.15 wt % collectively,   wherein the die-cast component   has a yield strength (R p0.2 ) of greater than 190 MPa and   an elongation at break (A 5 ) of greater than or equal to 7% and   a uniform elongation (A g ) and necking elongation (A z ) satisfy the condition A z ≥A g /2.   
     
     
         2 . The die-cast component according to  claim 1 , wherein the die-cast component has a uniform elongation (A g ) of at least 6% and a necking elongation (A z ) of at least 4%. 
     
     
         3 . The die-cast component according to  claim 1 , wherein the temperable aluminum alloy has at least one of the group consisting of:
 from greater than 6.5 to 9.0 wt % silicon (Si),   from 0.3 to 0.5 wt % magnesium (Mg),   from 0.3 to 0.6 wt % manganese (Mn),   from 0.15 to 0.3 wt % zinc (Zn),   from 0.10 to 0.20 wt % copper (Cu),   from 0.10 to 0.25 wt % iron (Fe),   from 0.05 to 0.15 wt % titanium (Ti), and   from 0.015 to 0.025 wt % strontium (Sr).   
     
     
         4 . The die-cast component according to  claim 3 , wherein the temperable aluminum alloy has at least one of the group consisting of:
 from greater than 6.5 to 8 wt % silicon (Si),   from 0.15 to 0.25 wt % zinc (Zn),   from 0.15 to 0.25 wt % iron (Fe).   
     
     
         5 . The die-cast component according to  claim 1 , wherein the temperable aluminum alloy has
 up to 0.05 wt % manganese (Mn) and/or   up to 0.05 wt % copper (Cu).   
     
     
         6 . A body component for a motor vehicle with a die-cast component according to  claim 1 . 
     
     
         7 . The body component according to  claim 6 , with at least one punch rivet and with another component, wherein the die-cast component is firmly connected to the other component by the punch rivet. 
     
     
         8 . A motor vehicle with a body component according to  claim 6 . 
     
     
         9 . A method for producing a die-cast component according to  claim 1 , wherein the method comprises a heat treatment with the following steps in the indicated sequence:
 at least a two-stage annealing, comprising at least
 a first annealing at a temperature in a range from 320° C. to 450° C. for a duration of from 20 minutes to 75 minutes and 
 a second annealing at a temperature in a range from 510° C. to 540° C. for a duration of from 5 minutes to 35 minutes, 
   quenching with a temperature gradient in a range of greater than 4 K/s and at least a three-stage artificial aging, comprising at least
 a first artificial aging at a temperature in a range from 100° C. to 180° C. for a duration of from 40 minutes to 150 minutes, 
 a second artificial aging at a temperature a the range from 180° C. to 300° C. for a duration of from 30 minutes to 100 minutes, and 
 a third artificial aging at a temperature in a range from 230° C. to 300° C. for a duration of from 5 minutes to 120 minutes. 
   
     
     
         10 . The method according to  claim 9 , wherein the first annealing takes place at a temperature in a range from 390° C. to 410° C. and/or for a duration of from 50 minutes to 70 minutes. 
     
     
         11 . The method according to  claim 9 , wherein the second annealing takes place at a temperature in a range from 520° C. to 535° C. and/or for a duration of from 25 to 30 minutes. 
     
     
         12 . The method according to  claim 11 , wherein the second annealing takes place at a temperature in a range from 525° C. to 535° C. 
     
     
         13 . The method according to  claim 9 , wherein the quenching takes place with a temperature gradient in a range from 7 K/s to 20 K/s. 
     
     
         14 . The method according to  claim 9 , wherein the first artificial aging takes place at a temperature in a range from 140° C. to 160° C. and/or for a duration of from 110 minutes to 130 minutes. 
     
     
         15 . The method according to  claim 9 , wherein the second artificial aging takes place at a temperature in a range from 190° C. to 210° C. and/or for a duration of from 50 minutes to 70 minutes. 
     
     
         16 . The method according to  claim 9 , wherein the third artificial aging takes place at a temperature in a range from 230° C. to 270° C. and/or for a duration of from 10 minutes to 30 minutes.