本實驗主要合金成份以Al-8Zn-2Mg-1.5Cu-xZr合金(x為0.15、0.49)、Al-1.0Mg-0.6Si-0.2Cu合金及Al-1.2Mg-1.0Si-1.0Cu-0.15Zr合金做為實驗材料，澆鑄船型模、Y-block金屬模尺寸為100×40×100 mm。船型模鑄件均質化、退火後固溶再T6處理；Y-block鑄件施以同樣均質化與退火後兩道次熱鍛60%變形量，最後固溶和T6處理。將時效後的兩種材料加工成拉伸試棒並測試拉伸性質，比較不同試棒的拉伸性質和微結構。 在鑄/鍛熱鍛變形量約60%後固溶及T6處理，可獲得高強度Al-8Zn-2Mg-1.5Cu-0.49Zr合金抗拉強度為583MPa和延伸率為8.4%；Al-1.2Mg-1.0Si-1.0Cu-0.15Zr合金，可得中高強度抗拉強度為420MPa和延伸率為10%；Al-1.0Mg-0.6Si-0.2Cu合金，可得良好延伸率為16%及適當抗拉強度為310MPa。 ;Three groups of alloys of Al-8Zn-2Mg-1.5Cu-xZr(x=0.15、0.49)、Al-1.0Mg-0.6Si-0.2Cu and Al-1.2Mg-1.0Si-0.15Zr were prepared and melted in this study to get boat molds and Y-block permanent mold castings in size of 100×40×100mm. After homogenization and annealing, the boat mold casting were removed for solution treatment and T6 treatment; the Y-block castings would subject to two passes of hot forged with 60% deformation then removed for solution treatment and T6 treatment. After aging all samples were machined to the standard tensile test specimens to get tensile strengths of different samples. Microstructures and tensile properties of different samples were compared and discussed. After the cast/forge hybrid process with 60% reduction by hot deformation, solution and aging treatment, the Al-8Zn-2Mg-1.5Cu-0.49Zr alloy samples obtained high strength of (UTS) 583MPa and 8.4% in elongation; the Al-1.2Mg-1.0Si-1.0Cu-0.15Zr alloy samples acquired moderate strength of (UTS) 420MPa and 10% in elongation; the Al-1.0Mg-0.6Si-0.2Cu alloy samples got excellent elongation of 16% with proper strength (UTS) of 310MPa.
