日本金属学会誌

J. Japan Inst. Metals, Vol. 49, No. 9 (1985),
pp. 759-764

Measurement of the Orientation Distribution of Grains in Ti Sheets by the Etch Pit Method

Yonosuke Murayama1, Kazuo Obara1 and Eihachiro Tanaka1

1The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai

Abstract:

In this experiment, the procedure to form oriented etch pits on a commercially pure titanium sheet was presented, and the feature of the orientation distribution of grains, containing the orientation relation between neighboring grains, was analyzed by the etch pit method. The shape of the etch pit is coincident with that introduced from the rotation of the 14-hedral model formed by the 0001 planes and the 1011 planes. Shape parameters Rc, Rp and Ra, have the following relation. Rc:Rp=1:1.4 (Ra=Rp/sin(61.4 π/180)=1.6).
Using such oriented etch pits, the feature of the orientation distribution in two differently textured titanium sheets were examined. In the sheets cross rolled at 873 K, 61% of the grains have the c-axis normal to the sheet plane. The preferred orientation is (0001)[10\bar10] and the number of grains with such an orientation are 23.1%. The frequency of the orientation difference of the c-axis between neighboring grains with angles between 0 and π/18 is over 80%. In the sheets rolled unidirectionally at 1173 K, the grains with the c-axis parallel to the sheet plane are 50%. The grains with the orientation in the range from (10\bar10)[11\bar25] to (10\bar10)[11\bar2 17] are 12.5% in number. The preffered orientation is from (10\bar10)[11\bar25] to (10\bar10)[11\bar2 17]. The orientation difference of the c-axis between neighboring grains is distributed uniformly in the whole range from 0 to π/2, so that this distribution is extremely different from that of the sheets cross rolled at 873 K.


(Received 1984/12/11)

Keywords:

etch pit method, polyhedral model, texture, titanium, relation of the orientation between neighboring grains


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