变形参数对<strong>2195 Al-Li</strong>合金动态再结晶的影响

doi:10.11900/0412.1961.2018.00430

金属学报

2019, Vol. 55

Issue (6): 709-719 DOI: 10.11900/0412.1961.2018.00430

本期目录 | 过刊浏览

变形参数对2195 Al-Li合金动态再结晶的影响

李旭¹,杨庆波¹,樊祥泽¹,呙永林²,林林²,张志清^1,³(

)

1. 重庆大学材料科学与工程学院重庆 400044
2. 西南铝业(集团)有限责任公司重庆 401326
3. 重庆西彭产业工业园区重庆 401326

Influence of Deformation Parameters on Dynamic Recrystallization of 2195 Al-Li Alloy

Xu LI¹,Qingbo YANG¹,Xiangze FAN¹,Yonglin GUO²,Lin LIN²,Zhiqing ZHANG^1,³(

)

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2. Southwest Aluminum Group Co. , Ltd. , Chongqing 401326, China
3. Chongqing Xipeng Industrial Park, Chongqing 401326, China

引用本文:

李旭,杨庆波,樊祥泽,呙永林,林林,张志清. 变形参数对2195 Al-Li合金动态再结晶的影响[J]. 金属学报, 2019, 55(6): 709-719.
Xu LI, Qingbo YANG, Xiangze FAN, Yonglin GUO, Lin LIN, Zhiqing ZHANG. Influence of Deformation Parameters on Dynamic Recrystallization of 2195 Al-Li Alloy[J]. Acta Metall Sin, 2019, 55(6): 709-719.

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摘要:

在应变速率0.01~1 s^-1、变形温度350~500 ℃下，通过平面应变热压缩实验研究了2195 Al-Li合金不同热变形条件下的动态再结晶(DRX)临界条件，对动态再结晶机制进行了讨论，并通过EBSD和TEM等手段分析了变形参数对不同类型动态再结晶行为的影响。结果表明，动态再结晶临界应变(ε_c)随着Zener-Hollomon参数值(Z)的降低而降低；动态再结晶在低Z值的变形条件下进行得更充分，以不连续动态再结晶(DDRX)为主，仅发现有少量的连续动态再结晶(CDRX)；连续和不连续动态再结晶都更容易在低的Z值下形成，而几何动态再结晶(GDRX)在Z值升高到一定程度才出现，并且随着Z值的进一步升高而增加，几何动态再结晶在一定程度上增加了晶粒数目，从而使动态再结晶分数略有升高。

关键词 ： 2195 Al-Li合金, 平面应变压缩, 变形参数, 动态再结晶

Abstract：

Al-Li alloys have attracted extensive attentions as promising structural materials in aerospace industries due to their excellent mechanical properties, and are usually formed through a variety of hot workings such as rolling and forging. Dynamic recrystallization (DRX) is considered as one of the key microstructure evolutions of Al alloys during hot working, and many works have been done concerning with DRX. However, the influence of deformation parameters on different types of DRX of 2195 Al-Li alloy is still unclear. In this work, hot plane strain compression tests were conducted at the strain rate range from 0.01 s^-1 to 1 s^-1 and the temperature range from 350 ℃ to 500 ℃ to investigate the critical condition of dynamic recrystallization of 2195 Al-Li alloy under different hot deformation conditions, DRX mechanisms were discussed, and the influence of deformation parameters on different types of DRX was revealed using EBSD and TEM. The results showed that the critical strain decreased with the decrease of Zener-Hollomon parameter (Z), DRX was more sufficient in lower Z value, and discontinuous dynamic recrystallization (DDRX) was primary type while only a little continuous dynamic recrystallization (CDRX) was found. Both CDRX and DDRX were promoted in lower Z value, geometric dynamic recrystallization (GDRX) only occurred in high Z value and increased with further increase of Z value, and the appearance of GDRX was accompanied by the increase of the number of DRX grains so that the DRX fraction slightly increased.

Key words： 2195 Al-Li alloy plane strain compression deformation parameters dynamic recrystallization

收稿日期: 2018-09-11

ZTFLH:

TG146.2

基金资助:中央高校基本科研业务费专项资金项目(No.106112017CDJQJ328840)

作者简介: 李旭，男，1994年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00430 或 https://www.ams.org.cn/CN/Y2019/V55/I6/709

图1 试样分析位置

图2 2195 Al-Li合金真应力-应变曲线

图3 2195 Al-Li合金θ-σ与(d2θ/dσ2)-σ曲线

图4 2195 Al-Li合金的再结晶临界应力曲线及lnεc-lnZ关系图

表1 各变形条件下的lnZ值

图5 2195 Al-Li合金变形组织的EBSD像

图6 图5f中晶界的取向差分布

图7 各类动态再结晶的体积分数与再结晶平均晶粒尺寸

图8 2195 Al-Li合金变形组织的TEM像

图9 T1相高分辨TEM像

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