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首页> 外文期刊>Physical review >Nickel-rhenium compound sheds light on the potency of rhenium as a strengthener in high-temperature nickel alloys
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Nickel-rhenium compound sheds light on the potency of rhenium as a strengthener in high-temperature nickel alloys

机译:镍-compound化合物阐明了as作为高温镍合金中的增强剂的潜力

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摘要

For many decades, it has been known that rhenium imparts a tremendous resistance to creep to the nickel-based high-temperature alloys colloquially known as superalloys. This effect is so pronounced that is has been dubbed "the rhenium effect." Its origins are ill-understood, even though it is so critical to the performance of these high-temperature alloys. In this paper we show that the currently known phase diagram is inaccurate, and neglects a stoichiometric compound at 20 at.% Re (Ni_4Re). The presence of this precipitate at low temperatures and the short-range ordering of Re in fcc-Ni observed at higher temperatures have important ramifications for the Ni-based superalloys. The Ni_4Re compound is shown to be stable by quantum mechanical high-throughput calculations at 0 K. Monte Carlo simulations show that it is thermally persistent up to ≈930 K when considering configurational entropy. The existence of this compound is investigated using extended x-ray absorption fine spectroscopy on a Ni_(96.62)Re_(3.38) alloy.
机译:几十年来,人们已经知道rh赋予了俗称超合金的镍基高温合金以极大的抗蠕变性。这种作用非常明显,被称为“ the效应”。尽管它对这些高温合金的性能至关重要,但其起源却得不到很好的理解。在本文中,我们证明了当前已知的相图是不准确的,并且忽略了在20 at。%Re(Ni_4Re)时的化学计量化合物。这种沉淀物在低温下的存在以及在较高温度下在fcc-Ni中Re的短程有序化对Ni基超合金具有重要的影响。通过量子力学高通量计算在0 K处显示Ni_4Re化合物是稳定的。蒙特卡洛模拟显示,当考虑构型熵时,它在≈930K时具有热持久性。使用扩展的X射线吸收精细光谱法对Ni_(96.62)Re_(3.38)合金研究了该化合物的存在。

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