Browse Publications Technical Papers 2000-01-1291

Aluminum Alloys for Automotive Knuckle Castings 2000-01-1291

Knuckle castings for the automotive industry have traditionally been made from ductile iron, but engineers are now looking to aluminum castings as a lightweight alternative. Amcast Automotive has been involved in the development and manufacture of A206 aluminum knuckle castings since 1989 when it first supplied Aluminum castings for Ford Motor Co. (MN-12 platform). Recently, several new high volume automotive knuckle castings have been introduced using A356 aluminum alloy with T-6 temper.
This paper presents mechanical property information on both A206 and A356 aluminum alloys to assist engineers in the design of knuckle castings in aluminum. In addition to microstructural evaluation, mechanical properties will be obtained from test bars cut from actual heat-treated knuckle castings. Mechanical property information will include:
  • Room temperature tensile, yield, and elongation values from mini-test bars (from knuckle castings)
  • Elevated temperature tensile, yield, and elongation values from mini-test bars
  • High frequency axial fatigue test data.
  • Hardness
The A206 aluminum alloy is expected to exhibit superior mechanical properties compared to the A356 aluminum alloy. In A206 aluminum alloy higher strength is achieved both at room temperature and at elevated temperatures because of higher copper and lower silicon contents. Similarly, A206 alloy may show a fatigue advantage for the same reason. Regardless of the property values, both these aluminum alloys are suitable for automotive casting production usage and this this information is intended to assist suspension a knuckle designer in switching from iron to aluminum.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Dissimilar Joining of Aluminum Alloy and Steel by Resistance Spot Welding


View Details


Aluminum Bronze Alloy, Centrifugal and Continuous-Cast Castings 81.5Cu - 10.3Al - 5.0Ni - 2.8Fe Quench Hardened and Temper Annealed (TQ50)


View Details


Mechanical Property Behaviour of Rheocast 319 Alloys with and without Iron Additions


View Details