Relationship between Fracture Toughness and Tensile Properties of A357 Cast Aluminum Alloy

Abstract

The fracture-related mechanical properties of the A357 cast aluminum alloy, namely, elongation to fracture, tensile strain energy density (tensile toughness), strain-hardening exponent, and plane strain fracture toughness were investigated. Correlations between these properties have been established for 25 different artificial aging heat-treatment conditions and for five minor variations in chemical composition. Empirical relationships between the strain energy density and both the tensile elongation to fracture and the strain-hardening exponent have been developed. Analysis of the fracture surfaces indicated that the fracture mechanism of the investigated specimens varies according to the artificial aging conditions. Moreover, empirical relationships between the fracture toughness and strain energy density and between fracture toughness and strain-hardening exponent have been developed; these can be used to estimate the plane strain fracture toughness of A357 as a function of yield strength and tensile toughness.

Quality Indices for Aluminum Alloy Castings: A Critical Review

“…In A206 [27] and A357 [36] castings, a strong linear relationship was observed, as shown in Figure 10, which can be written as follows:…”

“…In several studies [27,36,37] on cast Al alloys, the relationship between e F and w was investigated. In A206 [27] and A357 [36] castings, a strong linear relationship was observed, as shown in Figure 10, which can be written as follows:…”

“…For A206 and A357, k 0 = 3.85 [27] and 3.86 [36] MJ.m À3 , respectively. The similarity between the values of k 0 for the two alloys is noteworthy.…”

Effect of intermetallics on the microstructure and tensile properties of aluminum based alloys: Role of Sr, Mg and Be addition

“…8(a) with Fig. 9(a) reveals that increasing the solution heat treatment time did not further improve the mechanical properties and quality index values of the alloys containing Fe and Mg but without Be and Sr [23][24][25][26][27][28] additions.…”

Fracture Toughness of Metal Castings

“…Alexopoulos and Tirayakioglu [26] have determined the fracture toughness of A357 cast aluminum alloys with a few minor chemical modification. The raw stock for further machining required for studies was continuously cast with intent to keep porosity and inclusions at a minimum level.…”