This paper investigates the microstructural characteristics of Ti layer in ultrasonic additive manufacturing of Ti/Al laminate composites by electron backscattered diffraction and transmission electron microscopy. Results show that a face-centred cubic (FCC) phase is formed in the Ti matrix around the Ti/Al bonding interface, and it keeps and orientation relationship with hexagonal close-packed (HCP) Ti matrix. The phase transition from HCP to FCC occurs in the region with high shear strain, which is associated with the movement of Frank or Shockley partial dislocations. The high-volume fraction of FCC-Ti under high ultrasonic amplitude can favour the improvement in the Ti/Al interfacial bonding strength via enhancing the plastic deformability of Ti foil.
HuangM, XuC, FanGH, . Role of layered structure in ductility improvement of layered Ti–Al metal composite. Acta Mater. 2018;153:235–249. doi:10.1016/j.actamat.2018.05.005
2.
WangZQ, ZhangX, LiuMY, . Microstructure characterization and mechanical properties of the 304SS-(NiTif/FeAl) metal-intermetallic laminate composites. J Alloys Compd. 2023;943:169117. doi:10.1016/j.jallcom.2023.169117
3.
ZhangHM, ChaoYJ, LuoZ.Effect of interlayer on microstructure and mechanical properties of Al–Ti ultrasonic welds. Sci Technol Weld Joi. 2017;22(1):79–86. doi:10.1080/13621718.2016.1193386
4.
ParsonsEM.Lightweight cellular metal composites with zero and tunable thermal expansion enabled by ultrasonic additive manufacturing: modeling, manufacturing, and testing. Compos Struct. 2019;223:110656. doi:10.1016/j.compstruct.2019.02.031
5.
LiD.A review of microstructure evolution during ultrasonic additive manufacturing. Int J Adv Manuf Technol. 2021;113(1):1–19. doi:10.1007/s00170-020-06439-8
6.
WhiteDR.Ultrasonic consolidation of aluminum tooling. Adv Mater Process. 2003;161:64–66.
7.
FujiiHT, SriramanMR, BabuSS.Quantitative evaluation of bulk and interface microstructures in Al-3003 alloy builds made by very high power ultrasonic additive manufacturing. Metall Mater Trans A. 2011;42(13):4045–4055. doi:10.1007/s11661-011-0805-x
8.
ShimizuS, FujiiFT, SatoYS, . Mechanism of weld formation during very-high-power ultrasonic additive manufacturing of Al alloy 6061. Acta Mater. 2014;74:234–243. doi:10.1016/j.actamat.2014.04.043
9.
SridharanN, GussevMN, ParishCM, . Evaluation of microstructure stability at the interfaces of Al-6061 welds fabricated using ultrasonic additive manufacturing. Mater Charact. 2018;139:249–258. doi:10.1016/j.matchar.2018.02.043
10.
SriramanMR, BabuSS, ShortM.Bonding characteristics during very high power ultrasonic additive manufacturing of copper. Scr Mater. 2010;62(8):560–563. doi:10.1016/j.scriptamat.2009.12.040
11.
MaQC, MaJY, ZhouJL, . Abnormal dislocation substructure in the ultrasonically welded joints of Cu single crystals. Sci Technol Weld Joi. 2022;27(8):606–614. doi:10.1080/13621718.2022.2092381
12.
FujiiHT, EndoH, SatoYS, . Interfacial microstructure evolution and weld formation during ultrasonic welding of Al alloy to Cu. Mater Charact. 2018;139:233–240. doi:10.1016/j.matchar.2018.03.010
13.
ZhouYY, ChenJY, WangZQ, . Interfacial texture and bonding strength of Cu/Al laminate metal composite fabricated by ultrasonic additive manufacturing. Sci Technol Weld Joi. 2022;27(7):501–511. doi:10.1080/13621718.2022.2080446
14.
SridharanN, WolcottP, DapinoM, . Microstructure and texture evolution in aluminum and commercially pure titanium dissimilar welds fabricated using ultrasonic additive manufacturing. Scr Mater. 2016;117:1–5. doi:10.1016/j.scriptamat.2016.02.013
15.
WolcottPJ, SridharanN, BabuSS, . Characterisation of Al–Ti dissimilar material joints fabricated using ultrasonic additive manufacturing. Sci Technol Weld Joi. 2016;21(2):114–123. doi:10.1179/1362171815Y.0000000072
16.
ZhouYY, WangZQ, ZhaZP, . Achieve high interfacial bonding strength of Ti/Al laminated composite at room temperature via electropulsing-assisted ultrasonic additive manufacturing. Metall Mater Trans A. 2023;54:399–404. doi:10.1007/s11661-022-06923-8
17.
FujiiHT, GotoY, SatoYS, . Microstructure and lap shear strength of the weld interface in ultrasonic welding of Al alloy to stainless steel. Scr Mater. 2016;116:135–138. doi:10.1016/j.scriptamat.2016.02.004
18.
SridharanN, WolcottP, DapinoM, . Microstructure and mechanical property characterisation of aluminium–steel joints fabricated using ultrasonic additive manufacturing. Sci Technol Weld Joi. 2017;22(5):373–380. doi:10.1080/13621718.2016.1249644
19.
LevyA, MiriyevA, SridharanN, . Ultrasonic additive manufacturing of steel: method, post-processing treatments and properties. J Mater Process Technol. 2018;256:183–189. doi:10.1016/j.jmatprotec.2018.02.001
20.
HanTY, KuoC-H, SridharanN, . Effect of weld power and interfacial temperature on mechanical strength and microstructure of carbon steel 4130 fabricated by ultrasonic additive manufacturing. Manuf Lett. 2020;25:64–69. doi:10.1016/j.mfglet.2020.07.006
21.
HanTY, KuoC-H, SridharanN, . Effect of preheat temperature and post-process treatment on the microstructure and mechanical properties of stainless steel 410 made via ultrasonic additive manufacturing. Mater Sci Eng A. 2020;769:138457. doi:10.1016/j.msea.2019.138457
22.
LinJ-Y, NambuS, KosekiT.Interfacial phenomena during ultrasonic welding of ultra-low-carbon steel and pure Ti. Scr Mater. 2020;178:218–222. doi:10.1016/j.scriptamat.2019.11.037
23.
KuoC-H, SridharanN, HanT, . Ultrasonic additive manufacturing of 4130 steel using Ni interlayers. Sci Technol Weld Joi. 2019;24(5):382–390. doi:10.1080/13621718.2019.1607486
24.
JohnsonK, EdmondsHC, HigginsonRL, . New discoveries in ultrasonic consolidation nano-structures using emerging analysis techniques. Proc Inst Mech Eng, Part L. 2011;225(4):277–287.
25.
WardAA, ZhangYB, CorderoZC.Junction growth in ultrasonic spot welding and ultrasonic additive manufacturing. Acta Mater. 2018;158:393–406. doi:10.1016/j.actamat.2018.07.058
26.
WardAA, FrenchMR, LeonardDN, . Grain growth during ultrasonic welding of nanocrystalline alloys. J Mater Process Technol. 2018;254:373–382. doi:10.1016/j.jmatprotec.2017.11.049
27.
PaganM, PetrieC, LeonardC, . Interdiffusion of elements during ultrasonic additive manufacturing. Metall Mater Trans A. 2021;52(3):1142–1157. doi:10.1007/s11661-020-06131-2
28.
HongDH, LeeTW, LimSH, . Stress-induced hexagonal close-packed to face-centered cubic phase transformation in commercial-purity titanium under cryogenic plane-strain compression. Scr Mater. 2013;69(5):405–408. doi:10.1016/j.scriptamat.2013.05.038
29.
YuQ, KacherJ, GammerC, . In situ TEM observation of FCC Ti formation at elevated temperatures. Scr Mater. 2017;140:9–12. doi:10.1016/j.scriptamat.2017.06.033
30.
AoN, LiuDX, LiuCS, . Face-centered titanium induced by ultrasonic surface rolling process in Ti–6Al–4 V alloy and its tensile behavior. Mater Charact. 2018;145:527–533. doi:10.1016/j.matchar.2018.09.004
31.
WeiBQ, NiS, LiuY, . Three dimensional crystallographic orientation relationships for hexagonal close packed structure to face centered cubic structure transformation in pure titanium. Scr Mater. 2019;169:46–51. doi:10.1016/j.scriptamat.2019.05.010
32.
ZhengXD, GongMY, XiongT, . Deformation induced FCC lamellae and their interaction in commercial pure Ti. Scr Mater. 2019;162:326–330. doi:10.1016/j.scriptamat.2018.11.037
KongCY, SoarRC, DickensPM.Characterisation of aluminium alloy 6061 for the ultrasonic consolidation process. Mater Sci Eng A. 2003;363(1-2):99–106. doi:10.1016/S0921-5093(03)00590-2
35.
HeC, ZhangY, LiuCQ, . Unexpected partial dislocations within stacking faults in a cold deformed Mg−Bi alloy. Acta Mater. 2020;188:328–343. doi:10.1016/j.actamat.2020.02.010
36.
YangZQ, ChisholmMF, DuscherG, . Direct observation of dislocation dissociation and Suzuki segregation in a Mg–Zn–Y alloy by aberration-corrected scanning transmission electron microscopy. Acta Mater. 2013;61(1):350–359. doi:10.1016/j.actamat.2012.09.067
37.
GunduzIE, AndoT, ShattuckE, . Enhanced diffusion and phase transformations during ultrasonic welding of zinc and aluminum. Scr Mater. 2005;52(9):939–943. doi:10.1016/j.scriptamat.2004.12.015
38.
ChangYH, ZhangSY, LiebscherCH, . Could face-centered cubic titanium in cold-rolled commercially-pure titanium only be a Ti-hydride?Scr Mater. 2020;178:39–43. doi:10.1016/j.scriptamat.2019.11.010
39.
TraylorR, ZhangR, KacherJ, . Impurity and texture driven HCP-to-FCC transformations in Ti-X thin films during in situ TEM annealing and FIB milling. Acta Mater. 2020;184:199–210. doi:10.1016/j.actamat.2019.11.047
40.
WangH, ChaoQ, CuiXY, . Introducing C phase in additively manufactured Ti–6Al–4V: a new oxygen-stabilized face-centred cubic solid solution with improved mechanical properties. Mater Today. 2022;61:11–21. doi:10.1016/j.mattod.2022.10.026
41.
NiZL, YangJJ, YeFX.Microstructure and mechanical properties of copper to nickel ultrasonic spot welds. Mater Sci Eng A. 2020;796:140207. doi:10.1016/j.msea.2020.140207
42.
NiZL, LiuY, WangYH, . Interfacial bonding mechanism and fracture behavior in ultrasonic spot welding of copper sheets. Mater Sci Eng A. 2022;833:142536. doi:10.1016/j.msea.2021.142536
43.
FrielRJ, JohnsonKE, DickensPM, . The effect of interface topography for ultrasonic consolidation of aluminium. Mater Sci Eng A. 2010;527(16-17):4474–4483. doi:10.1016/j.msea.2010.03.094
