(TiH<sub>2</sub>+TiB<sub>2</sub>)/AA7075复合粉末激光选区熔化成形的显微组织与力学性能

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1240 KB) HTML (0 KB)
输出: BibTeX | EndNote (RIS)

摘要在AA7075合金粉末中加入0.6%~1.4%亚微米TiH₂和0.8%纳米TiB₂颗粒(均为质量分数,下同),采用低能球磨法制备(TiH₂+TiB₂)/AA7075复合粉末,再通过激光选区熔化成形(selective laser melting,SLM)制备(Ti+TiB₂)/AA7075复合材料,研究TiH₂添加量对复合材料显微组织与力学性能的影响。结果表明：亚微米TiH₂和纳米TiB₂颗粒的加入能显著抑制SLM成形AA7075合金的裂纹,添加1.4%TiH₂+0.8%TiB₂可使裂纹完全消除。随TiH₂添加量由0.6%增加至1.4%,显微组织中的柱状晶全部转变为等轴晶,平均晶粒尺寸由2.33 μm细化至1.38 μm。TiH₂添加量为1.4%的复合材料,抗拉强度和屈服强度分别为360 MPa和328 MPa,伸长率为12.0%。经T6热处理后,性能进一步提升,抗拉强度和屈服强度分别提高到461 MPa和394 MPa,伸长率增加至15.3%。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	欧阳盛
	刘允中
	沈君剑
	肖小军

关键词 ： 7075铝合金, TiH₂, TiB₂, 激光选区熔化, 显微组织, 力学性能

Abstract：0.6%-1.4% submicron TiH₂ and 0.8% nano-TiB₂ particles (mass fraction, the same as below) were added into AA7075 powders, low-energy ball milled (TiH₂+TiB₂)/AA7075 composite powders were used to fabricate composites by selective laser melting (SLM). Microstructures and mechanical properties of SLMed composites with different TiH₂additive amounts were studied. The results show that the addition of submicron TiH₂ and nano-TiB₂ particles can significantly inhibit the cracks of SLMed AA7075 composites. The cracks can be completely eliminated when 1.4%TiH₂ and 0.8%TiB₂are added. When the TiH₂ additive amount increases from 0.6% to 1.4%, columnar grains in the microstructure are all transformed into equiaxed grains, and the average grain size is refined to 1.38 μm from 2.33 μm. When the TiH₂ additive amount is 1.4%, the tensile strength, yield strength and elongation of the AA7075 composites are 360 MPa, 328 MPa and 12.0%, respectively. After T6 heat treatment, the properties are further improved. The tensile strength and yield strength increase to 461 MPa and 394 MPa, respectively, and the elongation increases to 15.3%.

Key words： 7075 alloy TiH₂ TiB₂ selective laser melting microstructure mechanical property

收稿日期: 2020-01-04 出版日期: 2020-08-11

ZTFLH:

TG146.2⁺1

基金资助:广东省重点领域研发计划资助项目(2019B090907001); 广东省科技计划资助项目(2014B010129002,2016B090913001)

通讯作者: 刘允中,教授,博士。电话：020-87110081;E-mail: yzhliu@scut.edu.cn

引用本文:

欧阳盛, 刘允中, 沈君剑, 肖小军. (TiH₂+TiB₂)/AA7075复合粉末激光选区熔化成形的显微组织与力学性能[J]. 粉末冶金材料科学与工程, 2020, 25(3): 197-205.
OUYANG Sheng, LIU Yunzhong, SHEN Junjian, XIAO Xiaojun. Microstructure and mechanical properties of selective laser melting of (TiH₂+TiB₂)/AA7075 composite powders. Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 197-205.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I3/197

[1] 董鹏, 李忠华, 严振宇, 等. 铝合金激光选区熔化成形技术研究现状[J]. 应用激光, 2015(5): 607-611.
DONG Peng, LI Zhonghua, YAN Zhenyu, et al.Research status of selective laser melting of aluminum alloys[J]. Applied Laser, 2015(5): 607-611.
[2] 李艳梅, 蓝哲雯, 陈英俊. SLM金属3D成型中支撑类缺陷优化研究[J]. 金属世界, 2019(4): 16-19.
LI Yanmei, LAN Zhewen, CHEN Yingjun.Research on supporting defect optimization in SLM Metal 3D Forming[J]. Metal World, 2019(4):16-19.
[3] 谢琰军, 杨怀超, 王学兵, 等. 选择性激光熔化7075合金组织和力学性能的研究[J]. 粉末冶金工业, 2018, 28(3): 13-18.
XIE Yanjun, YANG Huaichao, WANG Xuebin, et al.Study on microstructure and mechanical properties of 7075 aluminum alloy fabricated by selective laser melting[J]. Powder Metallurgy Industry, 2018, 28(3): 13-18.
[4] 吴义. 基于损伤的7075-T6铝合金HFQ工艺成形性实验研究[D]. 大连: 大连理工大学, 2017: 1-5.
WU Yi.Experimental study on formability of 7075-T6 aluminum alloy HFQ based on damage[D]. Dalian: Dalian University of Technology, 2017: 1-5.
[5] 朱海红, 廖海龙. 高强铝合金的激光选区熔化成形研究现状[J]. 激光与光电子学进展, 2018, 55(1): 22-28.
ZHU Haihong, LIAO Hailong.Research status of selective laser melting of high strength aluminum alloy[J]. Laser & Optoelectronics Progress, 2018, 55(1): 22-28.
[6] KAUFMANN N, IMRAN M, WISCHEROPP T M, et al.Influence of process parameters on the quality of aluminium alloy EN AW 7075 using selective laser melting (SLM)[J]. Physics Procedia, 2016, 83: 918-926.
[7] SISTIAGA M M L, MERTENS R, VRANCKEN B, et al. Changing the alloy composition of Al7075 for better processability by selective laser melting[J]. Journal of Materials Processing Technology, 2016, 238: 437-445.
[8] LEI Z L, BI J, CHEN Y B, et al.Effect of energy density on formability, microstructure and micro-hardness of selective laser melted Sc-and Zr-modified 7075 aluminum alloy[J]. Powder Technology, 2019, 356: 594-606.
[9] MARTIN J H, YAHATA B D, HUNDLEY J M, et al.3D printing of high-strength aluminium alloys[J]. Nature, 2017, 549(7672): 365-371.
[10] 韩延峰, 张瀚龙, 徐钧, 等. 基于Al-Ti-B细化剂的铝合金异质形核机制研究进展[J]. 中国材料进展, 2018, 37(8): 632-637.
HAN Yanfeng, ZHANG Hanlong, XU Jun, et al.Development of grain refining mechanism of Al alloys by Al-Ti-B master alloy[J]. Materials China, 2018, 37(8): 632-637.
[11] 刘相法, 边房秀. 铝合金组织细化用中间合金[M]. 长沙: 中南大学出版社, 2012: 49-54.
LIU Xiangfa, BIAN Fangxiu.Master alloys for the structure refinement of aluminium alloys[M]. Changsha: Central South University Press, 2012:49-54.
[12] ZHANG H, ZHU H, QI T, et al.Selective laser melting of high strength Al-Cu-Mg alloys: Processing, microstructure and mechanical properties[J]. Materials Science & Engineering A, 2016, 656: 47-54.
[13] 熊翔, 黄伯云. Ti和TiH₂与Al反应合成TiAl的研究[J]. 矿冶工程, 1997(3): 77-80.
XIONG Xiang, HUANG Baiyun.Synthesis of TiAl alloy by reaction of Ti and TiH₂ with Al powder[J]. Mining and Metallurgical Engineering, 1997(3): 77-80.
[14] 刘红卫, 陈康华. 原位合成TiB₂和Al₃Ti对ZL201的晶粒细化效果[J]. 特种铸造及有色合金, 2004, 12(2): 4-6.
LIU Hongwei, CHEN Kanghua.Influence of in-situ synthetic TiB₂ and Al₃Ti on particle refinement for ZL201 alloy[J]. Special-cast and Non-ferrous Alloys, 2004, 12(2): 4-6.
[15] 胡亮, 刘允中, 涂诚, 等. 纳米TiB₂对激光选区熔化2024铝合金显微组织与力学性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(4): 365-373.
HU Liang, LIU Yunzhong, TU Cheng, et al.Effects of nano-TiB₂ particles on microstructure and mechanical properties of AA2024 deposited by selective laser melting[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(4): 365-373.
[16] NIE X, ZHANG H, ZHU H, et al.Effect of Zr additive amount on formability, microstructure and mechanical properties of selective laser melted Zr modified Al-4.24Cu-1.97Mg-0.56Mn alloys[J]. Journal of Alloys and Compounds, 2018, 764: 977-986.
[17] 万达远, 李小强, 赖佳明, 等. 基于选择性激光熔化技术7075铝合金组织性能与裂纹的研究[J]. 应用激光, 2019, 39(1): 1-8.
WAN Dayuan, LI Xiaoqiang, LAI Jiaming, et al.Microstructure properties and crack of 7075 aluminum alloy based on selective laser melting technology[J]. Applied Laser, 2019, 39(1): 1-8.
[18] 万彩云, 陈江华, 杨修波, 等. 7xxx系AlZnMgCu铝合金早中期时效强化析出相的研究[J]. 电子显微学报, 2010, 29(5): 455-460.
WAN Caiyun, CHEN Jianghua, YANG Xiubo, et al.Study of the early & mid-stage hardening precipitates in a 7xxx AlZnMgCu aluminium alloy[J]. Journal of Chinese Electron Microscopy Society, 2010, 29(5): 455-460.
[19] 张云崖. Al-Zn-Mg-Cu合金再结晶的控制及亚晶界对MgZn₂粒子析出的影响[D]. 长沙: 中南大学, 2013: 40-46.
ZHANG Yunya.The control of recrystallization of Al-Zn-Mg-Cu alloys and effects of sub-grain boundaries on the precipitation of MgZn₂ phase particles[D]. Changsha: Central South University, 2013: 40-46.
[20] KING W E, BARTH H D, CASTILLO V M, et al.Observation of keyhole-mode laser melting in laser powder-bed fusion additive manufacturing[J]. Journal of Materials Processing Technology, 2014, 214(12): 2915-2925.
[21] RESCHETNIK W, BRUGGEMANN J P, AYDINOZ M E, et al.Fatigue crack growth behavior and mechanical properties of additively processed EN AW-7075 aluminium alloy[J]. Procedia Structural Integrity, 2016(2): 3040-3048.
[22] 黄卫东, 林鑫. 激光立体成形高性能金属零件研究进展[J]. 中国材料进展, 2010(6): 12-27.
HUANG Weidong, LIN Xin.Research progress in laser solid forming of high performance metallic component[J]. Materials China, 2010(6): 12-27.