Abstract
Ni-rich Ni-Mo alloys containing around 20 at. % Mo exist as a face-centered cubic, short-range ordered (SRO), solid solution (α) above around 868 °C, and transform to a long-range ordered (LRO), body-centered tetragonal structure (β) upon cooling slowly to below this temperature. Upon quenching, the α is retained, which can then be converted to β upon aging below 868 °C. The formation of the β structure induces considerable strengthening (e.g.. the hardness doubles), but is accompanied by embrittlement.A commercial alloy based on this composition is Hastelloy B2, and precautions are exercised in its use to prevent ordering and hence embrittlement. In a continuing effort to develop Ni-Mo alloys strengthened by ordering but with usable toughness, we have been examining the addition of Al to the base Ni-25 at. % Mo composition. Specimens containing 2. 5, 7 and 9 at. % Al, with Ni/Mo = 4.0, were made by arc melting the appropriate amounts of a Hastelloy B2 alloy and Al. The buttons were melted several times under an argon atmosphere.
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