(1. 西安交通大學(xué) 材料科學(xué)與工程學(xué)院金屬材料強(qiáng)度國家重點(diǎn)實(shí)驗(yàn)室， 西安 710049；
2. 中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410083)
摘 要: 以析出熱力學(xué)、長(zhǎng)大動(dòng)力學(xué)及強(qiáng)化理論為基礎(chǔ)，研究了具有盤狀析出相的鋁合金在時(shí)效過程中的析出相尺寸、體積分?jǐn)?shù)變化及其對(duì)時(shí)效合金強(qiáng)化效果的影響，得到了合金成分、時(shí)效參數(shù)與組織參數(shù)、屈服強(qiáng)度間的解析關(guān)系式，進(jìn)而從微觀與宏觀相結(jié)合的角度建立起了具有盤狀析出相鋁合金的時(shí)效工藝屈服強(qiáng)度量化模型，并將該模型應(yīng)用于Al-Cu二元系列合金的時(shí)效性能預(yù)測(cè)，取得了較滿意的結(jié)果。同時(shí)，由數(shù)據(jù)的歸納和組合得出了Al-Cu二元系列合金中盤狀析出相臨界形核能壘的簡(jiǎn)易求解式f(ΔG*, x0/xe)=常數(shù)，有助于該模型的普遍適用化。
關(guān)鍵字: 鋁合金; 盤狀析出相; 時(shí)效強(qiáng)化模型
plate-like-precipitate-containing Al alloys
（1. State Key Laboratory for Mechanical Behavior of Materials,
School of Material Science & Engineering,
Xi′an Jiaotong University, Xi′an 710049, P.R.China;
2. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, P.R.China）
Abstract:A simplified model was presented to establish the quantitative relations between yield strength of aged Al alloys containing plate-like precipitates and the sizes, volume fraction of precipitates, which are dominated by ageing temperature, time as well as alloy compositions. The nucleation, growth and coarse of the precipitates are integrated into the age-strengthening model based on some acceptable assumptions. The ageing-strengthening of Al-Cu binary alloys was satisfactorily simulated and predicted. Furthermore, the critical energy barrier for nucleation of precipitates in aged Al-Cu binary alloys, is determined from a simple ad hoc formula configured on the basis of tailoring relevant parameters, f (ΔG*, x0/xe)=constant, by which the model becomes of more feasibility, integrality and applicability.
Key words: aluminum alloys; plate-like precipitate; ageing strengthening model
