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sequence of Mg2Si is as follows [29,36]: Supersaturated solid solution → Guinier-Preston (GP) zones → β’(Mg2Si) → β(Mg2Si). Fig. 12 SEM back scatter electron image and EDX spectra of modified Al alloy......
machine (SVM) [4-6], relevance vector machine (RVM) [7], stochastic gradient boosting (SGB) [8] and genetic programming (GP) [9, 10], have been used to evaluate the potential of seismic soil......
热处理强化铝合金,Al-Zn-Mg合金的力学性能依赖于时效过程中形成的析出相,其主要析出序列为[2]:S.S.S.S→Solute clusters/GP I/GP II → η′→η.传统的热处理手段通过固溶,淬火,单/双级时效在基体中形成大量弥散分布的纳米级亚稳/稳定析出相以达到强化目的,但在峰值时效条件下,合金的应力腐蚀抗力(Stress corrosion resistance)往往较差...无序聚集区,在Al-Mg-Si,Al-Cu-Mg和Al-Zn-Mg等体系中可引起显著的强化效果,能有效抵抗疲劳裂纹扩展,展现出优异的综合性能.自然时效硬化效应最早由德国人Alfred Wilm报道,他发现杜拉铝(成分近似于AA2024)淬火后室温存放会发生缓慢硬化,最终可获得将近125HB的硬度值,远高于纯铝(15HB) [6].这种自然时效硬化效应后来被归因于合金中出现的溶质原子团簇/GP区.但......
represents strength contribution from remaining precipitates. Besides, strength is also significantly affected by metastable precipitate such as clusters, GP zone or β" formed during T4P treatment. Solute......
within the matrix for an AA2050 Al-Cu-Li alloy. LYU et al [18] reported that external stress can accelerate the coarsening of GP zones and η′ precipitates, and promote the formation of large rod-shaped......
相变惯序为:GP区→γ″→γ′→γ.时效初期,铍原子通过铜基体中的空位进行上坡扩散而形成富铍区,发生调幅分解,沿基体的{100}面上形成了条纹状的GP区和圆盘状结构γ″相;随着时效时间的延长,GP区不断长大,且γ″相逐渐转化成板条状的γ″,如图28所示[55-56].合金的主要强化相为与基体共格γ″相和半共格γ′相,是其时效过程中强度,电导率升高的主要原因,其中峰值时效时位错和γ′相的作用机理为绕......
distribution (GP) method to characterize the size of the largest inclusions in steels. However, to the author’s knowledge, GP distribution still is not applied to fatigue- initiating defect sizes in cast......
precipitation sequence [11]. The binary Al-Cu system involves Guinier-Preston (GP) zones, θ'' and θ'. The Al-Li system forms the △' precipitate with the nominal composition of Al3Li. The tertiary system......