超高应变率激光冲击不同厚度Al7050合金的层裂研究（英文）
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摘要
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0.33 mm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。0.33mm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,5mm厚Al7050合金的层裂尺寸增加,层裂厚度范围为343μm到364μm。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5mm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。
The spall characteristics of Al7050 alloy with different thicknesses 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 thick 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 thick Al7050 induced by LSP with Process-2 were analyzed by C-scan ultrasonic nondestructive testing with water immersion, optical microscope(OM) and SEM, respectively. The spall strength and LSP strain rate of 0.33 mm thick Al7050 were calculated by PDV data. Spall crater morphology was also analyzed. Results show that the spall sizes of 5 mm thick Al7050 increase with continued multiple LSP impacts and its spall thicknesses are in the range from 343 μm to 364 μm. Spall mechanism is mixture ruptures of ductile behavior with spherical voids and brittle behavior with straight cracks. Continued LSP-5 was the spall threshold of 5 mm thick Al7050. Compared with as-received material, the micro-hardness of 5 mm thick Al7050 with continued LSP-5 increases in the surface layer and decreases near rear free surface. The results provide 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.
The spall characteristics of Al7050 alloy with different thicknesses 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 thick 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 thick Al7050 induced by LSP with Process-2 were analyzed by C-scan ultrasonic nondestructive testing with water immersion, optical microscope(OM) and SEM, respectively. The spall strength and LSP strain rate of 0.33 mm thick Al7050 were calculated by PDV data. Spall crater morphology was also analyzed. Results show that the spall sizes of 5 mm thick Al7050 increase with continued multiple LSP impacts and its spall thicknesses are in the range from 343 μm to 364 μm. Spall mechanism is mixture ruptures of ductile behavior with spherical voids and brittle behavior with straight cracks. Continued LSP-5 was the spall threshold of 5 mm thick Al7050. Compared with as-received material, the micro-hardness of 5 mm thick Al7050 with continued LSP-5 increases in the surface layer and decreases near rear free surface. The results provide 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.
引文
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2 Lin B,Lupton C,Spanrad S et al.International Journal of Fatigue[J],2014,59:23
3 Zhang Y K,Lu J Z,Ren X D et al.Materials and Design[J],2009,30(5):1697
4 Gao Yukui.Rare Metal Materials and Engineering[J],2016,45(9):2347(in Chinese)
5 Peyre P,Fabbro R,Merrien P et al.Materials Science and Engineering A[J],1996,210(1-2):102
6 Lescoute E,De Rességuier T,Chevalier J M et al.Applied Physics Letters[J],2009,95(21):211 905
7 Mayer A E,Khishchenko K V,Levashov P R et al.Journal of Applied Physics[J],2013,113(19):193 508
8 Fortov V E,Kostin V V,Eliezer S.Journal of Applied Physics[J],1991,70(8):4524
9 Loison D,De Rességuier T,Dragon A et al.Journal of Applied Physics[J],2012,112(11):113 520
10 Tollier L,Fabbro R.Journal of Applied Physics[J],1998,83(3):1231
11 Wang Y,He H,Wang L et al.Journal of Applied Physics[J],2006,100:325
12 Wang Y G,Qi M L,He H L et al.Mechanics of Materials[J],2014,69(1):270
13 De Rességuier T,He H,Berterretche P.International Journal of Impact Engineering[J],2005,31(8):945
14 Cottet F,Boustie M.Journal of Applied Physics[J],1989,66(9):4067
15 Tyler C,Millett J C F,Bourne N K.AIP Conference Proceedings[J],2006,845(1):674
16 Lescoute E,De Rességuier T,Chevalier J M et al.Journal of Applied Physics[J],2010,108(9):093 510
17 De Rességuier T,Signor L,Dragon A et al.Journal of Applied Physics[J],2007,102(7):073 535
18 Jarmakani H,Maddox B,Wei C T et al.Acta Materialia[J],2010,58(14):4604
19 Wielewski E,Appleby-Thomas G J,Hazell P J et al.Materials Science and Engineering A[J],2013,578:331
20 Dalton D A,Brewer J L,Bernstein A C et al.Journal of Applied Physics[J],2008,104(1):013 526
21 Wu X Q,Duan Z P,Song H W et al.Journal of Applied Physics[J],2011,110:1021
22 Kanel G I.International Journal of Fracture[J],2010,163(1-2):173
23 Tollier L,Fabbro R,Bartnicki E.Journal of Applied Physics[J],1998,83:1224
24 Cuq-Lelandais J P,Boustie M,Berthe L et al.Journal of Physics D:Applied Physics[J],2009,42(6):65 402
25 Nie X F,He W F,Zang S L et al.Surface and Coatings Technology[J],2014,253:68
26 Nie X F,He W F,Li Q P et al.Journal of Laser Applications[J],2013,25(4):042 001