著者

吉岡 正三 山本 久 熊谷 雅晴

出版者

一般社団法人 表面技術協会

雑誌

金属表面技術 (ISSN:00260614)

巻号頁・発行日

vol.21, no.5, pp.272-276, 1970-05-01 (Released:2009-10-30)

参考文献数

5

被引用文献数

3 1

---

A simple and economical process for boriding metal surfaces was found. The process was only to immerse the metal in a hot salt bath containing borax and carborundum, where no special atmosphere was needed.Optimum conditions found for boriding of mild steel were to dip the steel in a bath containing 60-50wt% of borax and 40-50wt% of carborundum at 1, 000°C for 6hrs. The boride layer produced by this process was composed of Fe2B, which was 170μ in thickness, having about 1, 200 of Vickers hardness.The mild steel lying beneath the boride layer was also observed hardened. The results of chemical analysis and electron probe microanalysis showed that the hardening of the interior mild steel was attributed to the boron and carbon penetrating through the boride layer.

著者

W.Hume-Rothery著 吉岡正三訳

出版者

コロナ社

巻号頁・発行日

1968

著者

吉岡 正三 中山 豊 伊藤 太一郎 高田 勝典

出版者

一般社団法人 軽金属学会

雑誌

軽金属 (ISSN:04515994)

巻号頁・発行日

vol.24, no.7, pp.265-269, 1974-07-30 (Released:2008-10-30)

参考文献数

16

---

The basal slip of Mg3Cd single crystals was studied in the disordered and the ordered states. Results obtained are as follows:(1) The ordered specimens were very brittle and showed pronounced serrated flow.(2) In the disordered state CRSS depended on temperature below -78°C, while in the ordered state it scarcely depended on temperature.(3) CRSS at 20°C increased from-1.3kg/mm2 in the disordered state to-5.0kg/mm2 in the ordered state.(4) Slip lines in the disordered state were straight, coarse and distributed rather uniformly, while in the ordered state they diffused and localized.(5) In the disordered specimens dislocations arranged as pile-up arrays on the basal plane, and few dislocations on the nonbasal planes were observed. While, in the ordered specimens superlattice dislocations were observed on the basal plane where the dislocation density was low, however dislocation tangles consisting of unit dislocations on the basal and nonbasal planes were observed where the dislocation density was relatively high.