论文部分内容阅读
研究了不同含量的Ti和Mg对消失模铸造Al-Cu合金组织和力学性能的影响。结果表明,当Ti含量从0.3%提高至0.9%和1.2%时,其脆性相含量增多且组织形态逐渐粗大,Al-Cu合金的抗弯强度略有降低,但硬度较低。经535℃×15h固溶+70℃水淬+175℃×4h时效后,Al-Cu合金的抗弯强度和硬度均提高了约100%。在Ti含量为0.3%时,添加1.0%的Mg,Al-Cu合金的抗弯强度有所增加,硬度大大提高。Mg含量继续提高到1.5%和2.0%时,Al-Cu合金的硬度虽有所提高,但抗弯强度却有所降低。Mg含量增加的Al-Cu合金经固溶时效处理后,合金的抗弯强度和硬度也显著提高,且Mg含量为1.5%时热处理效果最好。研究结果还显示,金刚石表面镀Ti或增加Al-Cu合金胎体中的Ti含量有利于提高Al-Cu合金胎体对金刚石的把持力。
The effects of different contents of Ti and Mg on the microstructure and mechanical properties of Al-Cu alloy during lost foam casting were studied. The results show that when the content of Ti increases from 0.3% to 0.9% and 1.2%, the content of brittle phase increases and the microstructure gradually becomes coarse. The flexural strength of Al-Cu alloy slightly decreases, but the hardness is lower. After 535 ℃ × 15h solution + 70 ℃ water quenching + 175 ℃ × 4h aging, the flexural strength and hardness of Al-Cu alloy increased about 100%. When the content of Ti is 0.3%, 1.0% Mg is added, the bending strength of Al-Cu alloy increases and the hardness increases greatly. When the content of Mg continues to increase to 1.5% and 2.0%, the hardness of Al-Cu alloy increases but the flexural strength decreases. The flexural strength and hardness of Al-Cu alloy with increasing Mg content after solution treatment and aging treatment are also significantly improved, and the best heat treatment effect is obtained when Mg content is 1.5%. The results also show that diamond plating on the Ti surface or increasing the Ti content of the Al-Cu alloy matrix is beneficial to improve the Al-Cu alloy carcass holding force.