Abstract
The present work deals with the formation of hydride during MA of Al alloys with addition of Zr. The effect of hydride formation on the degassing as well as on the mechanical properties are also investigated. It is well known that Zr is able to bind considerable quantities of hydrogen by forming hydrides. Depending on the concentration of hydrogen, the composition of Zr-hydrides varies from ZrH to ZrH[sub 2]. The reaction of hydrogen with Zr has been extensively studied because of its technical importance in the nuclear industry. It is believed that the formation of hydride is the main reason causing embrittlement in Zr and Zr-alloys. Very few studies report the formation of hydrides in Zr-containing Al alloys. Zr in Al alloys can be used either as a grain refiner or as a second phase in the form of aluminide, Al[sub 3]Zr to strengthen Al alloys. Recently, it was reported that the hydrogen gas in powder metallurgical prepared Al alloys can be fixed in the form of hydrides by additions of some hydride-forming elements. As a result, a degassing treatment is no more needed and the fatigue strength can be improved at the same time. Details on the identification ofmore » those hydrides in Al alloys are not yet available.« less
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