Materials Transactions, Vol.49 No.05 (2008) pp.995-999
© 2008 The Japan Institute of Metals

Effects of Wavy Roll-Forming on Textures in AZ31B Magnesium Alloy

A. Yamamoto, Y. Tsukahara and S. Fukumoto

A new technique has been developed for randomizing the basal plane texture formed by rolling or extruding deformation in a magnesium alloy. Specimens are roll-formed using rolls having wavy surfaces at elevated temperatures. This technique has been applied to specimens of AZ31B magnesium alloy sheet. The specimens were heated at 623 K and 723 K for 300 s, and then immediately wavy roll-formed. This process was repeated 8 times, rotating the specimen at 90 degrees for each subsequent pass. The specimen showed a typical basal plane texture before the wavy roll-forming, and the texture was randomized after the treatment. Annealing at 573 K and 673 K, and/or flat-rolling at 623 K on the wavy roll-formed specimen caused a reversion to the basal plane texture. Transmission electron microscopic observations on the wavy roll-formed specimen showed dislocation substructures consisting of many twins and dense dislocations, which resembled those formed by conventional flat-rolling. Randomizing would occur by macroscopic mechanism, such as lattice rotation due to wavy form deformation.

(Received 2007/10/5; Accepted 2007/12/17; Published 2008/4/25)

Keywords: magnesium alloy, texture, randomizing, wavy roll-forming, deformation, recrystallization, electron backscattered diffraction pattern

PDF (Free)

Table of Contents

REFERENCES

1. M. Jotoku, A. Yamamoto and H. Tsubakino: JJILM. 56 (2006) 711–715.
2. A. Yamamoto, M. Jotoku and H. Tsubakino: Proc. Solid-to-Solid Transformation in Inorganic Materials 2005, vol.1, (TMS, 2005) pp.635–640.
3. A. Yamamoto, M. Jotoku and H. Tsubakino: Mater. Sci. Forum 488–489 (2005) 543–546.
4. A. Yamamoto and H. Tsubakino: Proc. Inter Conf. on Recrystallization and Related Phenomena, (The Japan Inst. Metals, 1999) pp.173–176.
5. A. Yamamoto, M. Kakishiro, M. Ikeda and H. Tsubakino: Mater. Sci. Forum 448–452 (2004) 669–672.
6. A. Yamamoto, M. Ikeda and H. Tsubakino: Mater. Sci. Forum 475–479 (2004) 493–496.
7. A. Yamamoto, J. Okuda and H. Tsubakino: Proc. Solid-to-Solid Transformation in Inorganic Materials 2005, vol.2, (TMS, 2005) pp.623–628.
8. A. Yamamoto, M. Terashita and H. Tsubakino: JJILM. 57 (2006) 99–104.
9. A. Yamamoto and Y. Tsukahara: JJILM. (2008), (in press).
10. A. Yamamoto and Y. Tsukahara: Mater. Sci. Forum 561–565 (2007) 2341–2344.
11. M. R. Barnet, M. D. Nave and C. J. Bettles: Mater. Sci. Eng. A A386 (2004) 205–211.
12. T. Murakami: JJILM. 52 (2002) 536–540.
13. T. Murai: JJILM. 54 (2004) 472–477.

© 2008 The Japan Institute of Metals
Comments to us : editjt@jim.or.jp