A319.0鑄鋁合金之破裂行為受富鐵相、富銅相以及矽粒子之形態和大小所影響，由破裂韌性試片之斷裂面金相分析顯示，破裂起始極易發生在針狀富鐵相之脆斷或針狀富鐵相與基地分離所形成之裂紋。結合鈹之添加與高溫固溶處理，可以降低針狀富鐵相之脆斷、及與基地分離之機會，因而，有效的提昇材料之強度、延性與破裂韌性。

The fracture behavior of A319 alloy is affected by the morphologies of the iron intermetallics, silicon particles and copper intermetallics. Fractographic analysis of tested compact tension specimens reveals that the fracture processes are mainly initiated by void nucleation at β-Al5FeSi platelets as a result of their cracking and decohesion from the matrix. Adding Be to the A319.0 alloy and optimizing the solution temperature can significantly decrease the number of fracture-initiation sites of β-Al5FeSi platelets and improve the tensile properties and fracture toughness.

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