退火处理对搅拌摩擦加工LZ91双相镁锂合金微观组织及力学性能的影响

材料导报

2020, Vol. 34

Issue (Z1): 307-311

金属与金属基复合材料

退火处理对搅拌摩擦加工LZ91双相镁锂合金微观组织及力学性能的影响

江雯^1,2, 蒋璐瑶^1,2, 黄伟九^1,2, 郭非^1,2, 董海澎^1,2

1 重庆理工大学材料科学与工程学院,重庆 400054;
2 重庆理工大学模具技术重庆市重点实验室,重庆 400054

Effect of Annealing Treatment on Microstructure and Mechanical Properties ofLZ91 Dual-Phase Magnesium-Lithium Alloy Processed by Friction Stir Processing

JIANG Wen^1,2, JIANG Luyao^1,2, HUANG Weijiu^1,2, GUO Fei^1,2, DONG Haipeng^1,2

1 College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;
2 Chongqing Key Laboratory of Mold Technology, Chongqing University of Technology, Chongqing 400054, China

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摘要 LZ91双相镁锂合金可通过搅拌摩擦加工方式实现组织细化及双相均匀化,搅拌摩擦加工中材料前进侧和后退侧流动性差异使两侧组织特征区别较大,力学性能不稳定。本研究采用光学显微镜(OM)、场发射扫描电子显微镜(SEM)、万能拉伸试验机,研究了退火处理对搅拌摩擦加工LZ91双相镁锂合金搅拌区微观组织及力学性能的影响。结果表明,不同特征的初始变形组织在热处理过程中的组织演变规律不同,双相分布均匀的细晶结构在热处理中稳定长大,前进侧与基体组织突变得到改善,逐渐由弱织构形成c-轴平行于PD方向的基面织构。后退侧团聚成岛状的α细晶在热处理中迅速长大,热稳定性较差。250 ℃下退火处理30 min后,搅拌摩擦加工LZ91镁锂合金均匀伸长率从5.8%提升至8.8%,拉伸中前进侧收缩率从0.2降低至0.1,应力集中得到有效改善,性能薄弱区域在退火处理前后均为后退侧组织。

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关键词: LZ91镁锂合金搅拌摩擦加工显微组织力学性能退火处理

Abstract: Grains and phases in LZ91 dual-phase Mg-Li alloy could be refined and homogenized by friction stir processing (FSP). The effects of annealing treatment on the microstructure and mechanical properties of LZ91 dual-phase Mg-Li alloy processed by friction stirring were studied by optical microscopy (OM), scanning electron microscopy (SEM) and uniaxial tensile test. The results showed that initial microstructure characte-ristics affected organizational evolution. Uniform and small dual-phases could grow smoothly during heat treatment. Drastic organizational interface between stir zone and matrix was weakened during annealing treatment. Texture of fine grains in advancing side were increased slowly. Fine grains in α-islands grew fast in retreating side of samples. Uniform elongation of FSPed LZ91 increased from 5.8% to 8.8% after annealing treatment at 250 ℃ for 30 min. Stress concentration was improved in advancing side of samples. Reduction of area decreased from 0.2 to 0.1. The stress concentration was improved effectively, and the weak area was retrograde before and after annealing treatment.

Key words: LZ91 magnesium-lithium alloy friction stir processing microstructure mechanical property annealing treatment

发布日期: 2020-07-01

ZTFLH:

TG146.2

基金资助: 重庆市自然科学基金(cstc2018jcyjAX0107;cstc2019jcyj-msxmX0111);中国博士后基金(2018M643407);重庆理工大学科研启动基金

作者简介: 江雯,重庆理工大学硕士研究生,主要从事镁锂合金搅拌摩擦加工变形机理及耐腐蚀性能研究等工作;蒋璐瑶,重庆大学博士(后),讲师。2017年于重庆大学镁合金工程技术研究中心获博士学位,从事低成本高性能新型镁合金合金设计及开发,镁合金剧烈塑性变形机理研究。研究成果在国内外期刊如Materials Science and Engineering A、Journal of Alloys and Compounds发表论文10余篇。作为项目负责人主持中国博士后面上项目、重庆市基础研究与前沿探索项目等4项。

引用本文:

江雯, 蒋璐瑶, 黄伟九, 郭非, 董海澎. 退火处理对搅拌摩擦加工LZ91双相镁锂合金微观组织及力学性能的影响[J]. 材料导报, 2020, 34(Z1): 307-311.
JIANG Wen, JIANG Luyao, HUANG Weijiu, GUO Fei, DONG Haipeng. Effect of Annealing Treatment on Microstructure and Mechanical Properties ofLZ91 Dual-Phase Magnesium-Lithium Alloy Processed by Friction Stir Processing. Materials Reports, 2020, 34(Z1): 307-311.

链接本文:

http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2020/V34/IZ1/307

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