吴俊峰,邹世坤,巩水利,车志刚,曹子文.超高应变率激光冲击不同厚度Al7050合金的层裂研究[J].稀有金属材料与工程,2019,48(4):1096~1101.[wu Junfeng,Zou Shikun,Gong Shuili,Che Zhigang,Cao Ziwen.Spall of different thicknesses Al7050 alloy under ultrahigh strain rate laser shock peening[J].Rare Metal Materials and Engineering,2019,48(4):1096~1101.]
超高应变率激光冲击不同厚度Al7050合金的层裂研究
投稿时间:2017-10-29  修订日期:2017-12-07
中文关键词:  Al7050合金  激光冲击强化  层裂机理;层裂阈值  层裂断口形貌
基金项目:国家重点专项(2016YFB1102705)
中文摘要:
      本文分析不同工艺参数(工艺1和工艺2)激光冲击不同厚度Al7050合金的层裂特性,研究Al7050合金的层裂机理和层裂阈值。采用光子多普勒测速(PDV)系统和扫描电镜(SEM),分析工艺1激光冲击0.33mm厚Al7050合金的自由面质点速度和自由面层裂断口形貌。采用超声波无损检测、光学显微镜(OM)和扫描电镜(SEM),分析工艺2激光冲击5mm厚Al7050合金的层裂大小、层裂厚度和层裂断口形貌。研究结果表明基于PDV测试数据,获得激光冲击0.33 mm厚Al7050合金的层裂强度和激光冲击应变率。0.33 mm厚Al7050合金的自由面断口形貌被详细分析。随着连续激光冲击次数增加,5 mm厚Al7050合金的层裂大小增加,层裂厚度范围为343 μm到364 μm。层裂机理为微空洞的韧性断裂和直裂纹的脆性断裂的混合断裂。单点连续5次激光冲击为5 mm厚Al7050合金的层裂阈值。与基体材料相比,单点连续5次激光冲击5 mm厚Al7050合金的表层显微硬度提高,而自由面附近的显微硬度降低。研究结果不仅为激光冲击强化铝合金的层裂行为研究提供重要见解,而且为激光冲击强化工业应用避免层裂提供基础研究。
Spall of different thicknesses Al7050 alloy under ultrahigh strain rate laser shock peening
英文关键词:Al7050 alloy  laser shock peening  spall mechanism  spall threshold  spall fracture morphology
英文摘要:
      The spall characteristics of different thicknesses Al7050 alloy treated by laser shock peening (LSP) with different process parameters (Process-1 and Process-2) were investigated to obtain the spall mechanism and spall threshold. The particle velocity of rear free surface and spall crater morphology in 0.33 mm thickness Al7050 induced by LSP with Process-1 were measured and analyzed by a Photonic Doppler Velocimetry (PDV) system and scanning electron microscope (SEM), respectively. Spall sizes, spall thicknesses and spall fracture morphology in 5 mm thickness Al7050 induced by LSP with Process-2 were analyzed by a C-scan ultrasonic nondestructive testing with water immersion, optical microscope (OM) and SEM, respectively. The results indicated that spall strength and LSP strain rate of 0.33 mm thickness Al7050 were calculated by PDV data. Spall crater morphology was also analyzed in detail. Spall sizes of 5 mm thickness Al7050 increased with continued multiple LSP impacts and its spall thicknesses were in range from 343 μm to 364 μm. Spall mechanism was mixture ruptures of ductile behavior with spherical voids and brittle behavior with straight cracks. Continued LSP-5 was the spall threshold of 5 mm thickness Al7050. Compared with as-received material, the micro-hardness of 5 mm thickness Al7050 with continued LSP-5 increased in the surface layer and decreased near rear free surface. The results provided not only some important insights on the spall behavior of aluminum alloy with laser shock but also fundamental research for avoiding the spall in industrial applications.
作者单位E-mail
吴俊峰 北京航空制造工程研究所 wjf88813@163.com 
邹世坤 北京航空制造工程研究所  
巩水利 北京航空制造工程研究所  
车志刚 北京航空制造工程研究所  
曹子文 北京航空制造工程研究所  
摘要点击次数: 109
全文下载次数: 75
查看全文  查看/发表评论  
关闭