. 2019 Nov 22;12(23):3852. doi: 10.3390/ma12233852

Table 2.

Classification of reviewed literature (June 2019).

Reference	Year of Publication	Studied Material	Machining Process	Analysed Lubrication Technique	Number of Citations	Impact
[6]	2017	Ti aluminide	Drilling	MQL	9	1
[30]	2016	Ti6Al4V	Drilling	Cryogenic/MQL	9	1
[31]	2016	Ti6Al4V	Drilling	Oil on water MQL	0
[32]	2018	Ti aluminide	Drilling	MQL	0	2
[1]	2015	Ti6Al4V	Milling	Cryogenic/MQL/Cryogenic + MQL	15	3
[2]	2016	Ti6Al4V	Milling	Cryogenic LN $_{2}$	7	3
[8]	2017	Ti6Al4V	Milling	Cryogenic/MQL/Cryogenic + MQL	12	3
[17]	2017	Ti6Al4V	Milling	MQL and MQCL	5	1
[22]	2017	Ti6Al4V	Milling	Cryogenic CO $_{2}$ /MQL/Cryogenic + MQL	4
[27]	2015	Ti6Al4V	Milling	Laser-assisted	27	1
[29]	2016	Ti6Al4V	Milling	Laser-assisted	10	2
[33]	2015	Ti6Al4V	Milling	Laser-assisted	5	2
[34]	2017	Ti6Al4V	Milling	Cryogenic	3	2
[35]	2017	Ti6Al4V	Milling	Cryogenic LN $_{2}$	2	2
[36]	2017	Ti6Al4V	Milling	Cryogenic/Dry	0
[37]	2016	Ti6Al4V	Milling	Cryogenic/Dry	3	3
[38]	2018	Ti6Al4V	Milling	MQL+nanoparticles	1	2
[39]	2016	Ti6Al4V	Milling	Cryogenic/Dry	2	3
[40]	2018	Ti6Al4V	Milling	Cryogenic + MQL	0	2
[41]	2017	Ti6Al4V	Milling	Cryogenic	0	2
[42]	2018	Ti6Al4V	Milling	Ultrasonic vibration-assisted	1	3
[43]	2019	Ti6Al4V	Milling	Cryogenic LN $_{2}$	0	2
[44]	2018	Ti6Al4V	Milling	Laser-assisted	0	1
[3]	2016	Ti6Al4V	Turning	HPC	18	2
[4]	2018	Ti5553	Turning	MQL/HPC	2	1
[8]	2016	Ti6Al4V	Turning	MQCL	13	2
[10]	2015	Ti6Al4V	Turning	Oil on water MQL/MQCL	19	2
[21]	2016	Ti6Al4V	Turning	Cryogenic/MQL/Cryogenic + MQL	14
[25]	2018	Ti6Al4V	Turning	HPC	0	1
[26]	2017	Ti6Al4V	Turning	HPC	9	1
[45]	2017	Ti6Al4V	Turning	Cryogenic LN $_{2}$	13	2
[46]	2016	Ti6Al4V	Turning	HPC	12	2
[47]	2017	Ti Grade 2	Turning	MQL	10	1
[48]	2017	Ti6Al4V	Turning	Gaseous nitrogen	7	1
[49]	2017	Ti6Al4V	Turning	Cryogenic + ethanol	6
[50]	2017	Ti Grade 2	Turning	MQL (R-H vortex tube)	7	2
[51]	2017	Ti6Al4V	Turning	Dry/MQL	6	1
[52]	2017	Ti6Al4V	Turning	MQCL	7	3
[53]	2018	Ti6Al4V	Turning	MQL	6	2
[54]	2018	Ti6Al4V	Turning	MQL	5	2
[55]	2017	Ti6Al4V	Turning	Dry	3
[56]	2017	Ti6Al4V	Turning	Cryogenic LN $_{2}$ (single and dual)	5	3
[57]	2019	Ti6Al4V	Turning	Cryogenic LN $_{2}$	3	1
[58]	2018	Ti6Al4V	Turning	Specific insert	3	1
[59]	2016	Ti6Al4V	Turning	Cryogenic/MQL/sub zero	2
[60]	2017	Ti6Al4V	Turning	Cryogenic LN $_{2}$	3	2
[61]	2018	Ti5553	Turning	Cryogenic/MQL/HPC	3	2
[62]	2018	Ti6Al4V	Turning	Cryogenic LN $_{2}$	2	2
[63]	2018	Ti6Al4V	Turning	Cryogenic LN $_{2}$	2	2
[64]	2017	Ti6Al4V	Turning	Cryogenic LN $_{2}$ /N $_{2}$	2	2
[65]	2017	Ti6Al4V	Turning	MQL	2	2
[66]	2019	Ti6Al4V ELI	Turning	MQCL	1	1
[67]	2018	Ti6Al4V	Turning	Sub-zero HPC	0	1
[68]	2018	Ti6Al7Nb	Turning	MQL	1	2
[69]	2017	Ti6Al4V	Turning	Nanolubrication	1	2
[70]	2018	TC17	Turning	MQL/oil on water MQL	0	1
[71]	2019	Ti5553	Turning	Cryogenic LN $_{2}$ /CO $_{2}$	0	1
[72]	2019	Pure titanium	Turning	Cryogenic + MQL	0	2
[73]	2018	Ti6Al4V	Turning	MQL/U-CMQL	0	2
[74]	2018	Ti6Al4V	Turning	MQL and MQCL	0	2
[75]	2019	Ti6Al4V ELI	Turning	HPC	0	2
[76]	2018	Ti6Al4V	Turning	Cryogenic LN $_{2}$ /CO $_{2}$	0	3
[77]	2017	Ti6Al4V	Turning	EHVSL	0	3
[78]	2018	Ti6Al4V	Turning	Cryogenic LN $_{2}$ (Internal cooling)	0	4
[79]	2018	Ti6Al4V	Turning	Laser-assisted	0