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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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两种高温合金渗Al防护层的退化过程
, PP. 412-493
Abstract:
研究了两种镍基高温合金上的渗Al层的退化过程。两种合金用两种方法施加的涂层组织相似外层以NiAl+Ni_2Al_3为母体,上面弥散着Ti(C,N)和Al_3Ti;内层由NiAl,Ni_3Al,Ti(C,N),M_(23)C_6和M_6C等相组成。渗Al层高温氧化时的退化与外层相变紧密相关,其过程如下Ni_2Al_3+NiAl(富Al)→NiAl(富Ni)→NiAl+Ni_3Al→Ni_3Al→Ni_3Al+γNi_2Al_3和NiAl(富Al)相极不稳定,而NiAl(富Ni)相十分稳定。Ni_3Al沿NiAl晶界生核标志着渗层退化的开始,渗层NiAl完全变成Ni_3Al+γ是退化的终了。
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