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・ Alpha Bluff
・ Alpha Books
・ Alpha Boy
・ Alpha Boys School
・ Alpha Bravo Charlie
・ Alpha Brummage
・ Alpha Bâ
・ Alpha Cables
・ Alpha Caeli
・ Alpha Camelopardalis
・ Alpha Cancri
・ Alpha Capricorni
・ Alpha Capricornids
・ Alpha capture system
・ Alpha Card Services
Alpha case
・ Alpha Cassiopeiae
・ Alpha catenin
・ Alpha cell
・ Alpha Centauri
・ Alpha Centauri (album)
・ Alpha Centauri (disambiguation)
・ Alpha Centauri (Doctor Who)
・ Alpha Centauri Bb
・ Alpha Centauri Bc
・ Alpha Centauri in fiction
・ Alpha Centauri or Die!
・ Alpha Centaurids
・ Alpha centrality
・ Alpha Centurion


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Alpha case : ウィキペディア英語版
Alpha case

In metallurgy, alpha case is the oxygen-enriched phase that occurs when titanium and its alloys are exposed to heated air or oxygen. Alpha case is brittle, and tends to create a series of microcracks which will reduce the metal's performance and its fatigue properties. Alpha case can be minimized or avoided is by processing titanium at very deep vacuum levels. However once present on the surface, the only way to remove Alpha case is by the subtractive methods of machining and /or chem milling.
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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