连续等通道转角挤压对Al-Ti-C合金组织与性能的影响

doi:10.11868/j.issn.1001-4381.2020.001073

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摘要

采用连续等通道转角挤压工艺, 以连续的方式对Al-Ti-C合金进行多道次挤压, 通过观察微观组织演化, 探讨晶粒细化机理和力学性能变化。结果表明: 连续等通道转角挤压工艺可有效细化Al-Ti-C合金微观组织, 晶粒尺寸减小至1 μm左右, 形变诱导是变形过程中最主要的晶粒细化机制; 高密度位错堆积引起Al基体和TiAl₃界面的裂纹以及TiAl₃内部的空洞产生, 裂纹进一步扩展贯穿整个TiAl₃颗粒, 最终导致第二相TiAl₃组织的细化, 同时细小的第二相TiAl₃组织的钉扎机制和剪切机制促进了Al基体细化; 连续等通道转角挤压1道次后, 合金硬度提升最明显, 与原始态相比提高59.2%;之后随挤压道次的增加, 硬度提升的趋势变缓, 合金塑性下降, 韧性提高。

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	邵琦
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	李英龙

关键词 ：连续等通道转角挤压, Al-5Ti-0.2C合金, 细化机理, TiAl₃

Abstract：

The Al-Ti-C alloy was extruded in multiple passes in a continuous manner by continuous equal channel angular pressing process. Through observation of the microstructure evolution, the mechanism of grain refinement and changes in mechanical properties were discussed.The results show that continuous equal channel angular pressing process can effectively refine the microstructure of Al-Ti-C alloy, and the grain size is reduced to about 1 μm.The deformation induction is the most important grain refinement mechanism in the deformation process.The accumulation of high density dislocations causes cracks at the interface between the Al matrix and TiAl₃ and voids inside the TiAl₃. The cracks further propagate through the entire TiAl₃ particles, ultimately leading to the refinement of the second phase TiAl₃ structure.At the same time, the pinning mechanism and shearing mechanism of the fine second phase TiAl₃ structure promote the refinement of the Al matrix.After one pass of continuous equal channel angular pressing, the hardness of the alloy increases most obviously, which is 59.2% higher than that of the original state.With the increase of the number of extrusion passes, the increasing trend of hardness slows down, the plasticity of the alloy decreases, and toughness increases.

Key words： continuous equal channel angular pressing Al-5Ti-0.2C alloy refinement mechanism TiAl₃

收稿日期: 2020-11-19 出版日期: 2022-03-19

中图分类号:

TG379

基金资助:国家自然科学基金项目(U1760105)

通讯作者: 李英龙 E-mail: liyl@smm.neu.edu.cn

作者简介: 李英龙(1961—)，男，教授，博士生导师，研究方向为轻合金组织细化与凝固成形一体化技术、超声场耦合下材料制备新技术与界面结构调控，联系地址：辽宁省沈阳市和平区东北大学材料科学与工程学院(110819)，E-mail: liyl@smm.neu.edu.cn

引用本文:

邵琦, 吴晓玉, 张玲, 皮宗力, 李英龙. 连续等通道转角挤压对Al-Ti-C合金组织与性能的影响[J]. 材料工程, 2022, 50(3): 115-121.
Qi SHAO, Xiaoyu WU, Ling ZHANG, Zongli PI, Yinglong LI. Effect of continuous equal channel angular pressing on microstructure and properties of Al-Ti-C alloy. Journal of Materials Engineering, 2022, 50(3): 115-121.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.001073 或 http://jme.biam.ac.cn/CN/Y2022/V50/I3/115

Fig.1 连续等通道转角挤压示意图

Fig.2 不同挤压道次下Al-5Ti-0.2C合金的TEM微观组织
(a)1道次；(b)2道次

Fig.3 挤压4道次下Al-5Ti-0.2C合金的TEM微观组织
(a)亚晶；(b)孪晶

Fig.4 不同挤压道次下Al-5Ti-0.2C合金中α-Al的平均晶粒尺寸变化

Fig.5 Al-5Ti-0.2C合金原始铸态SEM微观组织

Fig.6 不同挤压道次下Al-5Ti-0.2C合金SEM微观组织
(a)1道次；(b)2道次；(c)4道次；(d)5道次

Fig.7 X面的硬度值随挤压道次的变化

Fig.8 不同挤压道次下Al-5Ti-0.2C合金的拉伸断口形貌
(a)原始铸态；(b)1道次；(c)2道次；(d)4道次

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