【摘要】 通过对合金的收缩应变和热裂抗力及准固态拉伸行为进行测试,研究了合金元素(Si,La)对Al-4.5Cu合金凝固行为的影响。结果表明,Si,La能使Al-4.5Cu的热裂倾向性降低;加入2%Si使合金的再辉现象非常严重,导致合金不可能有很高的强度而很快断裂;与其它Al-4.5Cu-Si合金相比,Al4.5Cu3Si合金具有很强的补缩能力,断裂应力值最高;La的加入能缩小二次枝晶间距,明显提高合金的抗热裂性能。更多还原

【Abstract】 The effect of alloy elements on the quasi-solid solidification behavior of Al-4.5Cu alloy has been studied. The results indicate that Si and La can reduce the hot cracking tendency of Al-4.5Cu; adding 2%Si to matrix, the releasement of crystallization enthalpies makes the recalescence very severe, so the alloy cracks and cant have high strength; Al4.5Cu3Si has a strong ability of compensation and its fracture stress is highest among the Al-Cu-Si alloys; adding of La can reduce the secondary dendrite arm spacing, and the hot cracking properties are improved obviously.更多还原