Preparation method of high-performance praseodymium-holmium-aluminum alloy

一种高性能镨钬铝合金的制备方法

Abstract

The invention relates to a preparation method of a high-performance praseodymium-holmium-aluminum alloy. The preparation method comprises the following steps: (1) adding a preheated Al-Pr-Ho alloy into a molten Al-Si-Cu alloy and preparing a Pr/Ho rare earth aluminum alloy with mass percentage of 0.1-0.9%, wherein the ratio of Pr to Ho is 1:(0.5-2); (2) introducing high-energy ultrasonic treatment during melting and performing intermittent ultrasonic treatment for 5-10min; (3) controlling the temperature of a melt at 730-750 DEG C and keeping the temperature for 20-30min; continuously performing ultrasonic treatment for 5-10min; (4) reducing the temperature of the melt to 720-730 DEG C, refining, degassing, deslagging and pouring. The alloy prepared by the preparation method provided by the invention has stable ingredients; by an alloying effect and an ultrasonic effect of Pr/Ho, a microstructure of the Al-Si-Cu alloy is significantly improved, spheroidized grains are refined, the morphology of a second phase is changed and the strength of the alloy is greatly improved; simultaneously, by adding Pr/Ho, micron-size heat-stable strengthening phases, namely Al11Pr3 and Al3Ho, are formed, these phases play roles in hindering dislocation movement and pinning a crystal boundary and the mechanical properties of the alloy are greatly improved. The process is simple, safe, reliable and convenient to operate and the pollution of three wastes is avoided.
一种高性能镨钬铝合金的制备方法,包括以下步骤:(1)在熔化的Al-Si-Cu合金中加入预热的Al-Pr-Ho合金,配制成含质量百分数为0.1~0.9%的Pr/Ho稀土铝合金,其中稀土Pr:Ho为1:0.5~2;(2)熔化时引入高能超声处理,间歇超声5~10min;(3)将熔体温度控制在730~750℃保温20~30min;继续超声5~10min;(4)将熔体降至720~730℃精炼、除气、除渣浇注。本发明合金成分稳定,通过Pr/Ho的合金化作用和超声作用,显著改善Al-Si-Cu合金显微组织,细化球化晶粒,改变第二相形态,大幅提高合金强度;同时Pr/Ho的加入,形成了微米级热稳定强化相Al11Pr3、Al3Ho,这些相起到了阻碍位错移动和钉扎晶界的作用,极大的提高了合金的机械性能。且工艺简单、安全可靠,操作方便,无三废污染。

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    CN-106521260-AMarch 22, 2017兰州理工大学Modified hypereutectic aluminum silicon alloy and preparation method thereof