Al—Cu合金凝固过程中准固态力学性能及微量元素的影响

采用自制实验装置研究了Ａｌ－５％Ｃｕ合金在凝固过程中的准固态强度，强度增长率，断裂应变以及Ｂ，Ｔｉ，盐类细化剂和富Ｃｅ混合稀土对合金准固态力学性能的影响。研究结果表明，合金的准固态区即热脆性区，Ｂ，Ｔｉ和稀土都能降低合金准固相线温度，提高强度增长率和准固相线附近的强度。稀土的作用强于Ｂ和Ｔｉ，合金的中添加盐类细化剂后，合金准固态强度和断裂应变都比未加盐类细化剂的要低。

MECHANICAL PROPERTIES OF QUASI-SOLID Al-Cu ALLOY AND INFLUENCE OF TRACE ELEMENTS DUING SOLIDIFICAfION

The increase rate of strength, range of quasi-solid and failure strain of quasi-solid A1-5%Cu alloy during soliamcation are investigated with special apparatus. The influence of B,Ti, salt-refiner and mischmetal on the mechanical properties is also studied. Results obtained show that the range of quasi-solid is equivalent to the range of hot brittleness, and B, Ti as well as mischmetal all lower the quasi-solidus and enhance the strength around solidus and the increase rate of strength of the alloy. The effect of mischmetal is greater than that of B, Ti.Salt-refiner decreases the strength of quasi-solid and the failure strain of the alloy.