加钛和加硼方式对铝合金的晶粒细化及其衰退行为的影响

通过对比实验,研究了电解加钛与经Al-Ti、Al-Ti-B中间合金向工业纯铝熔配加钛的晶粒细化效果及其衰退行为,以及Al-B中间合金对电解低钛铝合金的晶粒细化效果及衰退行为的影响,还分析了硼对电解低钛铝合金的晶粒细化和抗衰退行为的影响.结果表明,在钛含量为0.10%和0.15%的条件下,电解加钛晶粒细化作用的衰退速度比熔配加Al-Ti中间合金要慢;熔配加Al-Ti-B中间合金细化晶粒作用的抗衰退能力则明显高于电解加钛和熔配加Al-Ti中间合金;加Al-B中间合金可有效提高电解低钛铝合金的细化效果和抗衰退能力,并使其明显高于电解加钛和熔配加Al-Ti或Al-Ti-B中间合金.

Effects of ways for adding titanium and boron on grain refinement of aluminum alloy and its fading behaviors

The grain refinement effect and fading behaviors of titanium added to commercial pure aluminum by electrolysis and by Al-Ti and Al-Ti-B master alloy, and added to electrolytic low-titanium aluminum alloys by Al-B master alloy were investigated through comparing experiment. The experiment results show that when titanium content is 0.10% or 0.15%, the fading of grain refinement of titanium added by electrolysis is slower than that of titanium added by Al-Ti master alloy. After Al-Ti-B master alloy added into pure aluminum, the resisting fading ability of grain refinement is superior to those of above two kinds of refining methods in the whole holding time. The Al-B master alloy can improve greatly the grain refinement effect and the resisting fading ability of electrolytic low-titanium aluminum alloys and make it much better than that of the titanium added by electrolysis, Al-Ti or Al-Ti-B master alloy.