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摘要：Al-Ti-B中間合金用作鋁和鋁合金的細(xì)化劑，而鑄態(tài)的細(xì)化效果有限。本文研究了等通道擠壓(ECAP)對(duì)Al-Ti-B中間合金顯微組織、顯微硬度、電導(dǎo)率的影響以及不同ECAP變形Al-Ti-B中間合金對(duì)純鋁的細(xì)化效果。實(shí)驗(yàn)結(jié)果表明：經(jīng)過(guò)不同道次ECAP變形的Al-Ti-B中間合金，顯微組織明顯發(fā)生變化，隨道次的增加，桿狀的組織逐漸變?yōu)榧?xì)小的等軸晶。Al-Ti-B中間合金電導(dǎo)率隨道次增加，從62.2%降低到56.9%。顯微硬度隨道次增加而逐漸增大，8道次硬度最大為61.8HV。 從經(jīng)過(guò)ECAP變形Al-Ti-B細(xì)化的鋁宏觀照片可以看出，ECAP變形后的中間合金細(xì)化鋁的效果比鑄態(tài)中間合金細(xì)化的效果要好，隨著ECAP道次的增加，柱狀晶逐漸減少，細(xì)小的等軸晶組織逐漸增加，8道次等軸晶幾乎布滿整個(gè)截面，即8道次的Al-Ti-B中間合金細(xì)化鋁的效果最好。中間合金細(xì)化鋁的電導(dǎo)率隨ECAP道次增加從66.9%降低到63.8%。細(xì)化鋁的硬度隨道次增加先增大后降低但趨于穩(wěn)定，4道次中間合金細(xì)化的鋁的硬度達(dá)到最大為38.72HV，8道次中間合金細(xì)化的鋁硬度下降到38.62HV。 關(guān)鍵詞：中間合金，Al-Ti-B，ECAP，細(xì)化劑，顯微組織，顯微硬度，電導(dǎo)率，細(xì)化效果
Abstract:Al-Ti-B master alloys is refiner for aluminum and aluminum alloy, but the refinement effect of the cast is limited. This article describes equal channel angular pressing(ECAP) on the Al-Ti-B master alloy microstructure, microhardness, electrical conductivity and the different passes ECAP， the Al-Ti-B master alloy of aluminum refinement effect. The results showed: after different passes of the Al-Ti-B master alloys significantly change the microstructure, with the increase passes，in which the organization was small equiaxed grains. Al-Ti-B master alloy electrical conductivity increases with the passes down to 56.9% from 62.2%, the hardness increases with the passes, the maximum hardness is 61.8HV,8 pass. Can be seen from the aluminum macro photos, the effect of the master alloy after ECAP, refining aluminum is better than the effect of refinement of the cast master alloy, with the increasing of ECAP passes, columnarcrystal gradually decreased ,small equiaxed gradually increases, 8 pass inferior axis crystal is almost covered the entire cross-section, refinement effect of 8 pass Al-Ti-B master alloy was the best . The electrical conductivity of refinement aluminum down to 63.8% from 66.9% with the ECAP passes increasing，the hardness first increases with the pass and then decreased but steadily, the hardness of 4 pass master alloy refining aluminum maximum to 38.72HV. Aluminum hardness of 8 pass master alloys refined down to 38.62HV. Keywords: master alloy, Al-Ti-B, ECAP, Refiner, microstructure, microhardness, electrical conductivity, refinement effect
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