搅拌摩擦焊接AZ31镁合金低周疲劳性能（英文）
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摘要
作为新型大塑性变形技术,搅拌摩擦焊接技术(FSW)已成功应用于超细晶材料的制备。采用FSW对热轧态AZ31镁合金进行连接,对母材和FSW接头的低周疲劳性能进行了研究。结果表明:在疲劳和单轴拉伸测试过程中,焊合区与前进侧热机械影响区交界处为性能薄弱区域。FSWAZ31接头的低周疲劳寿命、屈服强度、抗拉强度以及断后延伸率均低于母材。AZ31镁合金疲劳测试过程中的主要变形机制为位错滑移,疲劳断口表面呈现出明显的疲劳纹。最终,发现母材和FSW接头低周疲劳行为符合Coffin-Manson和Basquin关系。
Friction stir welding(FSW) has been validated to be a severe plastic deformation method for development of ultrafine-grained metals. In this study, hot-rolled AZ31 magnesium alloy plate was processed by FSW, and the effect of FSW on the low-cycle fatigue(LCF) behavior of AZ31 magnesium alloy was analyzed. The results show that the interface between the stir zone and thermo-mechanically affected zone at the advancing side is the weakest region, in which the monotonic tension and fatigue fracture occur. Compared with those of the base metal(BM), the LCF fatigue life, the yield strength, the ultimate tensile strength and the elongation of FSW specimen decrease. The main deformation during LCF is dislocation slip deformation. The fracture surface exhibits a typical fatigue characteristic with the fatigue striations. Finally, we found that the LCF behavior of BM and FSW specimens can be well described by the Coffin-Manson and Basquin's relations.
Friction stir welding(FSW) has been validated to be a severe plastic deformation method for development of ultrafine-grained metals. In this study, hot-rolled AZ31 magnesium alloy plate was processed by FSW, and the effect of FSW on the low-cycle fatigue(LCF) behavior of AZ31 magnesium alloy was analyzed. The results show that the interface between the stir zone and thermo-mechanically affected zone at the advancing side is the weakest region, in which the monotonic tension and fatigue fracture occur. Compared with those of the base metal(BM), the LCF fatigue life, the yield strength, the ultimate tensile strength and the elongation of FSW specimen decrease. The main deformation during LCF is dislocation slip deformation. The fracture surface exhibits a typical fatigue characteristic with the fatigue striations. Finally, we found that the LCF behavior of BM and FSW specimens can be well described by the Coffin-Manson and Basquin's relations.
引文
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2 Park S H, Hong S G, Lee B H et al. International Journal of Fatigue[J] 2010, 32:1835
3 Tian D D, Liu X S, He G Q et al. Materials Science and Engineering A[J], 2016, A654:60
4 Ni D R,Chen D L,Yang J et al. Materials and Design[J],2014, 56:1
5 Mirza F A, Chen D L, Li D J et al. Materials and Design[J],2014,64:63
6 Chen G, Lu LT, Cui Y et al. International Journal of Fatigue[J], 2015, 80:364
7 Zhu R, Cai X, Wu Y et al. Materials and Design[J], 2014, 53:992
8 Lv F, Yang F, Duan Q Q et al. Scripta Materialia[J], 2009, 61:887
9 Begum S, Chen D, Xu S et al. International Journal of Fatigue[J], 2009, 31:726
10 Mao Y Q, Ke L M, Chen Y H et al. Journal of Materials Science and Technology[J], 2018, 34(1):228
11 Guo N, Fu Y L, Wang Y Z et al. Materials and Design[J],2017,113:273
12 Ugender S. Journal of Magnesium and Alloys[J], 2018, 6(2):205
13 Mironov S, Onuma T, Sato Y S et al. Materials Characterization[J],2017, 130:1
14 Kush P M, Vishvesh J B. Journal of Materials Processing Technology[J], 2017, 239:336
15 Venkatesh K M, Arivarsu M, Manikandan M A et al. Materials Today:Proceedings[J], 2018, 5(5):13227
16 Kumar N, Mishra R, Huskamp C S et al. Materials Science and Engineering A[J], 2011, 528:5883
17 Mishra R S, Ma Z Y. Materials Science and Engineering R[J],2005, 50:1
18 Chowdhury S M, Chen D L, Bhole S D et al. Proceedia Engineering[J], 2010, 2(1):825
19 Naik B S, Chen D L, Cao X M et al. Metallurgical and Materials Transactions A[J], 2013, 44:3732
20 Yang J, Ni D R, Wang D et al. Metallurgical and Materials Transactions A[J], 2013, 45:2101
21 Dallmeier J, Denk J, Huber O et al. International Journal of Fatigue[J].2015, 80:306
22 Geng C J, Wu B L, Du X H et al. Transactions of Nonferrous Metals Society of China[J],2013, 23:1589
23 Standard Test Methods for Tension Testing of Metallic Materials, ASTM Standards T68[S]. 2015
24 Hu Z L, Wang X S, Yuan S J. Materials Characterization[J],2012, 73:114
25 Yuan W, Mishra R S, Carlson B et al. Scripta Materialia[J],2011, 64:580
26 Mironov S, Onuma T, Sato Y S et al. Acta Materia[J], 2015,100:301
27 Xin R L, Zheng X, Liu Z et al. Journal of Alloys and Compounds[J], 2016, 659:51
28 Woo W, Choo H, Brown D W et al. Scripta Materialia[J],2006, 54:1859
29 Park S H C, Sato Y S, Kokawa H. Metallurgical and Materials Transactions A[J], 2003, 34A:987
30 Xin R L, Liu D J, Shu X G et al. Journal of Alloys and Compounds[J],2016,670:64
31 Kwon S, Song K, Shin K S et al. Transactions of Nonferrous Metals Society of China[J], 2010, 20:533
32 Chen C, Liu T, Lv C et al. Materials Science and Engineering A[J],2012, 539:223
33 Zhu R, Wu Y J, Ji W Q et al. Materials Letters[J], 2011, 65:3593
34 Yin S M, Yang H J, Li S X et al. Scripta Materialia[J], 2008,58:751
35 Koike J, Fujiyama N, Ando D et al. Scripta Materialia[J],2010, 63:747
36 Huang G S, Li J H, Han T Z et al. Materials and Design[J],2014, 58:439
37 Mokdad F, Chen D L. Materials and Design[J], 2015, 67:436
38 Hong S G, Park S H, Lee C S. Journal of Materials Research[J], 2010, 25:784
39 Barnett M R, Bouaziz O, Toth L S. International Journal of Plasticity[J], 2015, 72:151
40 Wu W, An K. Journal of Alloys and Compounds[J], 2016, 656:539
41 Wu L, Jain A, Brown D W et al. Acta Materia[J], 2008, 56:688