Al-Mg-Sc-Ti合金中Al3(Scx,Ti1-x)粒子的析出行为

doi:10.11901/1005.3093.2020.165

材料研究学报

2020, Vol. 34

Issue (10): 737-743 DOI: 10.11901/1005.3093.2020.165

研究论文

本期目录 | 过刊浏览

Al-Mg-Sc-Ti合金中Al₃(Sc_x,Ti_1-_x)粒子的析出行为

陈显明¹(

), 潘清林², 范莹莹¹

1.肇庆学院电子与电气工程学院肇庆 526061
2.中南大学材料科学与工程学院长沙 410083

Precipitation of Al₃(Sc_x,Ti_1-_x) Particles in Al-Mg-Sc-Ti Alloy

CHEN Xianming¹(

), PAN Qinglin², FAN Yingying¹

1. School of Electronic and Electrical Engineering, Zhaoqing University, Zhaoqing 526061, China
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China

引用本文:

陈显明, 潘清林, 范莹莹. Al-Mg-Sc-Ti合金中Al₃(Sc_x,Ti_1-_x)粒子的析出行为[J]. 材料研究学报, 2020, 34(10): 737-743.
Xianming CHEN, Qinglin PAN, Yingying FAN. Precipitation of Al₃(Sc_x,Ti_1-_x) Particles in Al-Mg-Sc-Ti Alloy[J]. Chinese Journal of Materials Research, 2020, 34(10): 737-743.

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摘要:

用激冷铸造法制备Al-5.5Mg-0.25Sc-0.04Ti合金，研究了在不同温度退火后其硬度随时间的变化，并用金相显微镜(OM)和透射电镜(TEM)研究了这种合金中Al₃(Sc_x,Ti_1-_x)第二相粒子的存在形式和形成机制。结果表明：用急冷铸造法制备的Al-5.5Mg-0.25Sc-0.04Ti铸态合金中Sc和Ti原子主要以固溶的形式存在于α(Al)基体中，在电镜下很难观察到这些粒子。铸态合金在较低温度(低于250℃)下退火时其硬度提高得比较慢，退火较长时间才能出现硬度的峰值；而在比较高的温度(高于350℃)退火硬度提高得非常快，很快出现峰值。但是，硬度出现峰值后继续退火则大幅度降低；在300℃退火硬度的热稳定性比较高。硬度的变化，与次生Al₃(Sc_x,Ti_1-_x)粒子的析出密切相关。在较低温度下次生Al₃(Sc_x,Ti_1-_x)粒子的析出不充分且粒径较小，对晶界、亚晶界和位错的钉扎作用较弱；而在过高的温度下Al₃(Sc_x,Ti_1-_x)粒子发生粗化，使合金的性能降低。

关键词 ：有色金属及其合金, Al-Mg-Sc-Ti合金, 激冷铸造, 初生/次生Al₃(Sc_x，Ti_1-_x)粒子, 含钪铝合金, 析出行为

Abstract：

Cast ingot of Al-5.5Mg-0.25Sc-0.04Ti alloy was prepared by chill casting, and of which the hardness change with time at different annealing temperatures was assessed by hard- meter. While the morphology and formation process of the precipitates Al₃(Sc_x,Ti_1-_x) of the alloy were investigated by means of metallographic microscopy (OM) and transmission electron microscopy (TEM). The results show that Sc and Ti atoms mainly exist as solid-solute in the α-Al matrix when the alloy was made by chill casting, while in such case, precipitates Al₃(Sc_x,Ti_1-_x) could hardly be observed by electron microscopy. Annealing at lower temperatures (below 250℃) the hardness of as-cast alloy increases slowly, and the hardness peak appears only after a long annealing time. Annealing at higher temperatures (above 350℃) the hardness increases very quickly, and the hardness peak of the alloy appears quickly, but when the hardness peak appears the hardness will decrease greatly as the annealing continues. Among others, the alloy presents the highest thermal stabilitywhen annealing at 300℃. The changes in hardness are closely related to the secondary precipitates of Al₃(Sc_x,Ti_1-_x). If the annealing temperature is lower, the precipitates of Al₃(Sc_x,Ti_1-_x) is incomplete and their size is smaller, so the pinning effect on grain boundary, subgrain boundary and dislocation is weaker. But when the annealing temperature is higher, the coarsening of precipitates of Al₃(Sc_x,Ti_1-_x) will occur, it results in poor alloy properties.

Key words： Non-ferrous metals and alloys Al-Mg-Sc-Ti alloy chill casting primary/secondary Al₃(Sc_x,Ti_1-_x) particle aluminum alloy with scandium precipitation behavior

收稿日期: 2020-05-18

ZTFLH:

TG146.2

基金资助:国家自然科学基金(51402258)

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.165 或 https://www.cjmr.org/CN/Y2020/V34/I10/737

表1 合金的名义化学成分

图1 铸态和退火后合金试样的金相照片和TEM照片

图2 在不同温度退火后Al-Mg-Sc-Ti合金的硬度曲线

图3 在不同温度退火后Al-Mg-Sc-Ti合金中粒子的TEM照片和能谱

表2 Al3Sc/Al3Ti/Al3(Ti,Sc)和Al的晶格常数[19~21]和错配度

图4 屈服强度增量与析出相颗粒半径的关系

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