Effect of Heat Treatment Conditions on the Mechanical Properties and Machinability of Ti15Sn<i>x</i>Cu Alloys

Tsao, Lung-Chuan

doi:10.1590/1980-5373-MR-2019-0574

Lung-Chuan Tsao ^**e-mail: tlclung@mail.npust.edu.tw

National Pingtung University of Science & Technology, Institute of Materials Engineering, Neipu Township, Pingtung County, Taiwan

https://orcid.org/0000-0001-9569-6511

*e-mail: tlclung@mail.npust.edu.tw

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Figure 1
Optical micrographs of the Ti15SnxCu alloys: (a) AS Ti15Sn, (b) HT Ti15Sn, (c) AS Ti15Sn2Cu and (d) HT Ti15Sn2Cu.

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Figure 2
SEM micrograph of Ti15SnxCu alloys: (a) AS Ti15Sn, (b) HT Ti15Sn, (c) AS Ti15Sn2Cu and (d) HT Ti15Sn2Cu. The inserts show the high magnification microstructure.

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Figure 3
XRD patterns of the Ti15SnxCu alloys²³23 Tsao LC. Effects of Cu addition on the microstructure and mechanical properties of Ti15Sn alloys. Mater Sci Eng A. 2009;698:98-103. http://dx.doi.org/10.1016/j.msea.2017.05.046.
http://dx.doi.org/10.1016/j.msea.2017.05... ^,³⁶36 Tsao LC, Chang SY. Influence of Cu addition on the structures and properties of Ti15SnxCu alloys. Mater Sci Technol. 2017;33(15):1846-53. http://dx.doi.org/10.1080/02670836.2017.1325565.
http://dx.doi.org/10.1080/02670836.2017.... .

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Figure 4
Bending property of Ti15SnxCu under different treatment condition: (a) bending strength and (b) bending modulus.

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Figure 5
The relative ratios (%) of both bending strength and bending modulus: (a) AS versus HT and (b) Ti15Sn versus Ti15Sn2Cu.

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Figure 6
SEM fractographs of Ti15SnxCu alloys: (a) AS Ti15Sn, (b) HT Ti15Sn, (c) AS Ti15Sn2Cu and (d) HT Ti15Sn2Cu.

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Figure 7
The higher magnification SEM fractographs of Ti15SnxCu alloys: (a) AS Ti15Sn, (b) HT Ti15Sn, (c) AS Ti15Sn2Cu and (d) HT Ti15Sn2Cu.

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Figure 8
Cut surfaces of Ti15SnxCu samples: (a) AS Ti15Sn, (b) HT Ti15Sn, (c) AS Ti15Sn2Cu and (d) HT Ti15Sn2Cu.

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Figure 9
Metal chips cut from Ti15SnxCu samples: (a) AS Ti15Sn, (b) HT Ti15Sn, (c) AS Ti15Sn2Cu and (d) HT Ti15Sn2Cu.

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Figure 10
Average length of metal chips of Ti15SnxCu alloys.

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Table 1
Bending property of Ti15SnxCu under different treatment condition.

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Table 2
The relative ratios (%) of bending strength and bending modulus of AS versus HT of Ti15SnxCu.

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Table 3
The relative ratios (%) of bending strength and bending modulus of Ti15Sn versus Ti15Sn2Cu alloy.

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Alloy	Alloying element	Bending strength	Bending modulus	Ref.
Alloy	(wt%)	(MPa)	(GPa)	Ref.
CP-Ti	-	843.2 ± 42.2	98.1 ± 5.3
ATi15Sn	-	1275.3 ± 63.2	102.9 ± 6.5
HT Ti15Sn	-	1312.7 ± 65.4	110.1 ± 5.9
AS Ti15SnxCu	2Cu	1392.2 ± 69.5	106.4 ± 7.6
HT Ti15SnxCu	2Cu	1420.3 ± 71.1	116.4 ± 6.8
Ti5SnxCr	0 ~ 13Cr	1657 - 2505	97 -153	³⁴34 Hsu HC, Wu SC, Hsu SK, Chen CY, Ho WF. Structure and mechanical properties of as-cast Ti-5Sn-xCr alloys. Mater Sci Eng A. 2014;606:157-64. http://dx.doi.org/10.1016/j.msea.2014.03.099. http://dx.doi.org/10.1016/j.msea.2014.03...
Ti6Al7Nb	-	1943 ± 26	111 ± 3	⁴⁵45 Lin CW, Ju CP, Lin JHC. Comparison among mechanical properties of investment-cast C.P. Ti, Ti-6Al-7Nb and Ti-15Mo-1Bi alloys. Mater Trans. 2004;45(10):3028-32. http://dx.doi.org/10.2320/matertrans.45.3028. http://dx.doi.org/10.2320/matertrans.45....
Ti15Mo1Bi	-	1975 ± 38	90 ± 1
TixSi	1 ~ 12.5Si	1621 - 2231	120 - 180	⁴⁶46 Hsu HC, Wu SC, Hsu SK, Li YC, Ho WF. Structure and mechanical properties of as-cast Ti-Si alloys. Intermetal. 2014;47:11-6. http://dx.doi.org/10.1016/j.intermet.2013.12.004. http://dx.doi.org/10.1016/j.intermet.201...
TixMo	7.5 ~ 20Mo	1395 -1650	55 - 87	⁴⁷47 Ho WF. Effect of omega phase on mechanical properties of Ti-Mo alloys for biomedical applications. J Med Biol Eng. 2008;28:47-51.

Alloy	Bending strength	Bending modulus
Ti15Sn	+ 2.9	+ 7.0
Ti15Sn2Cu	+ 2.0	+ 9.4

Condition	Bending strength	Bending modulus
AS	+ 9.2	+ 3.4
HT	+ 8.2	+ 5.7

[1] *e-mail: tlclung@mail.npust.edu.tw

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Effect of Heat Treatment Conditions on the Mechanical Properties and Machinability of Ti15SnxCu Alloys

Abstract