© The Institution of Engineering and Technology
The high-strength of Ti-1Al-8V-5Fe (Ti-185) alloy is due to TiH2 powders produced at different compaction pressures and compared with hydride–dehydride-Ti powders. The objective of this work was to investigate the microstructural evolution and mechanical properties of Ti-185 alloy under different compaction pressures. The dehydrogenation characteristics of TiH2-185 and the oxygen contents of sintered samples were evaluated by thermogravimetric analysis and mass spectrometer (TG-MS) and oxygen/nitrogen (O/N) analysers. The corresponding microstructural evolution and change in mechanical properties were analysed by means of scanning electron microscopy, X-ray diffraction, electro-universal tester, and hardness tester, respectively. Results show that with the increase in compaction pressure, the green and sintered density and densification rates increase, but the volume fraction of α-phase decreases. The TiH2-185 samples have higher densification and sintered density, lower oxygen content than Ti-185 samples, which is attributed to its better compressibility and superior self-cleaning ability as well as more water produced. In addition, the sintered TiH2-185 samples exhibit higher yield strength and hardness in comparison with the sintered Ti-185 samples. The enhanced mechanical properties are attributed to its higher density and less soft α-phase in the microstructure.
References
-
-
1)
-
2. Joshi, V.V., Lavender, C., Moxson, V.S., et al: ‘Development of Ti-6Al-4V and Ti-1Al-8V-5Fe alloys using low-cost TiH2 powder feedstock’, J. Mater. Eng. Perform., 2013, 22, pp. 995–1003 (doi: 10.1007/s11665-012-0386-x).
-
2)
-
1. Boyer, R., Welsch, G., Collings, E.W.: ‘Materials properties handbook – titanium alloys’ (ASM International, Ohio, 1998), .
-
3)
-
6. Zhang, Y.N., Wang, C.M., Zhang, Y.G., et al: ‘TiH2 based Ti-1Al-8V-5Fe PM alloys with different addition methods of alloying elements’, Mater. Manuf. Process., 2018, 8, (33), pp. 849–855 (doi: 10.1080/10426914.2017.1376079).
-
4)
-
15. Esteban, P.G., Thomas, Y., Baril, E., et al: ‘Study of compaction and ejection of hydrided-dehydrided titanium powder’, Met. Mater. Int., 2011, 17, pp. 45–55 (doi: 10.1007/s12540-011-0207-z).
-
5)
-
24. Sahoo, R., Jha, B.B., Sahoo, T.K.: ‘Effect of primary alpha phase variation on mechanical behaviour of Ti-6Al-4V alloy’, Mater. Sci. Tech., 2015, 31, (12), pp. 1486–1494 (doi: 10.1179/1743284714Y.0000000736).
-
6)
-
7. Ivasishin, O.M., Moxson, V.: ‘Low-cost titanium hydride powder metallurgy’, in Qian, M., Froes, H.F. (Eds.): ‘Titanium powder metallurgy: science, technology and applications’ (Butterworth-Heinemann, Kidlington, 2015), pp. 124–128.
-
7)
-
3. Devaraj, A., Joshi, V.V., Srivastava, A., et al: ‘A low-cost hierarchical nanostructured beta-titanium alloy with high strength’, Nat. Commun., 2016, 7, p. 111176 (doi: 10.1038/ncomms11176).
-
8)
-
4. Gao, S.Y., Liu, P., Wang, C.M., et al: ‘Microstructure and mechanical properties of low-cost Ti-1Al-8V-5Fe alloy using PM method’, Powder Metall. Technol., 2014, 32, (6), pp. 427–430.
-
9)
-
13. Chen, W., Yamamoto, Y., Peter, W.H., et al: ‘The investigation of die-pressing and sintering behavior of ITP CP-Ti and Ti-6Al-4V powders’, J. Alloy Compd., 2012, 54, pp. 440–447 (doi: 10.1016/j.jallcom.2012.06.131).
-
10)
-
17. Wei, Y.H., Wang, C.M., Zhang, Y.G., et al: ‘The compactability of unsaturated titanium hydride powders’, J. Mater. Eng. Perform., 2018, 27, pp. 5752–5761 (doi: 10.1007/s11665-018-3659-1).
-
11)
-
8. Ivasishin, O.M., Eylon, D., Bondarchuk, V.I., et al: ‘Diffusion during powder metallurgy synthesis of titanium alloys’, Defect Diffus. Forum, 2008, 277, pp. 177–185 (doi: 10.4028/www.scientific.net/DDF.277.177).
-
12)
-
19. ASTM B312: ‘Standard test method for green strength for compacted metal powder specimens’. 2009.
-
13)
-
12. Chen, W., Yamamoto, Y., Peter, W.H., et al: ‘Cold compaction study of armstrong process Ti-6Al-4 V powders’, Powder Technol.., 2011, 214, pp. 194–199 (doi: 10.1016/j.powtec.2011.08.007).
-
14)
-
9. Sharma, B., Vajpai, S.K., Ameyama, K.: ‘Microstructure and properties of beta Ti-Nb alloy prepared by powder metallurgy route using titanium hydride powder’, J. Alloy. Compd., 2016, 656, pp. 978–986 (doi: 10.1016/j.jallcom.2015.10.053).
-
15)
-
20. Lou, J., Gabbitas, B., Zhang, D., et al: ‘Effects of initial powder compact thickness, lubrication, and particle morphology on the cold compaction behavior of Ti powder’, Metall. Mater. Trans. A, 2015, 46, (8), pp. 3646–3655 (doi: 10.1007/s11661-015-2925-1).
-
16)
-
22. Zheng, Y.F., Yao, X., Liang, J.M., et al: ‘Microstructures and tensile mechanical properties of titanium rods made by powder compact extrusion of a titanium hydride powder’, Metall. Mater. Trans. A, 2016, 47, (4), pp. 1842–1853 (doi: 10.1007/s11661-016-3333-x).
-
17)
-
5. Zhang, Y.N., Wang, C.M., Zhang, Y.G., et al: ‘Fabrication of low-cost Ti-1Al-8V-5Fe by powder metallurgy with TiH2 and FeV80 alloy’, Mater. Manuf. Process., 2017, 16, (32), pp. 1869–1873 (doi: 10.1080/10426914.2017.1303163).
-
18)
-
18. ASTM B331: ‘Standard test method for compressibility of metal powders in uniaxial compaction’. 2010.
-
19)
-
10. Smith, L.N., Midha, P.S., Graham, A.D.: ‘Simulation of metal powder compaction, for the development of a knowledge based powder metallurgy process advisor’, J. Mater. Process., 1998, 79, pp. 94–100 (doi: 10.1016/S0924-0136(97)00387-7).
-
20)
-
16. Robertson, I.M., Schaffer, G.B.: ‘Comparison of sintering of titanium and titanium hydride powders’, Powder Metall., 2010, 53, pp. 12–19 (doi: 10.1179/003258909X12450768327063).
-
21)
-
21. Mei, L.B., Wang, C.M., Wei, Y.H., et al: ‘Effects of hydrogen content on powder metallurgy characteristic of titanium hydrides’, Int. J. Hydrogen. Energ., 2018, 43, (14), pp. 7102–7107 (doi: 10.1016/j.ijhydene.2018.02.114).
-
22)
-
14. Borisovskaya, E.M., Nazarenko, V.A., Podrezov, Y.N., et al: ‘Mechanical properties of powder titanium at different production stages’, Powder Metall. Met. Ceram., 2008, 47, pp. 406–413 (doi: 10.1007/s11106-008-9035-1).
-
23)
-
11. Poquillon, M., Lemaitre, J., Baco-Carles, V., et al: ‘Cold compaction of iron powders-relations between morphology and mechanical properties part I: powder preparation and compaction’, Powder Technol.., 2002, 126, pp. 65–74 (doi: 10.1016/S0032-5910(02)00034-7).
-
24)
-
23. Ivasishin, O.M., Savvakin, D.G., Bielov, I.S., et al: ‘Microstructure and properties of titanium alloys synthesized from hydrogenated titanium powders’. Proc. Conf. on Science and Technology of Powder Materials: Synthesis, Consolidation and Properties, Pittsburg, USA, September 25–28, 2005, pp. 151–158.
http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2018.5736
Related content
content/journals/10.1049/mnl.2018.5736
pub_keyword,iet_inspecKeyword,pub_concept
6
6