(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(guó)家重點(diǎn)實(shí)驗(yàn)室, 西安 710049；
2. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室, 長(zhǎng)沙 410083)
摘 要: 基于合金中不同尺度第二相對(duì)其塑性的影響以及塑性與韌性指標(biāo)之間的內(nèi)在聯(lián)系，建立了高強(qiáng)鋁合金中粗大第二相顆粒、中間尺寸第二相顆粒以及時(shí)效強(qiáng)化第二相顆粒形態(tài)與其斷裂韌性間的多元非線性關(guān)系解析模型。借助于該模型的理論分析，可以得出不同尺度第二相顆粒尺寸、體積分?jǐn)?shù)改變對(duì)高強(qiáng)鋁合金斷裂韌性的定量影響，并且可以解釋鋁合金板材斷裂韌性的取向效應(yīng)以及加工變形對(duì)斷裂韌性的弱化作用，更進(jìn)一步地能夠給出在確保鋁 合金高強(qiáng)度的前提下改善其斷裂韌性的優(yōu)化方案。
關(guān)鍵字: 鋁合金；不同尺度第二相；斷裂韌性；解析模型
strength aluminum alloys containing
second particles of various sized scales
SUN Jun1, CHEN Kang-hua2
（1. State Key Laboratory for Mechanical Behavior of Materials, School of
Materials Science & Engineering, Xi′an Jiaotong University,
Xi′an 710049, China;
2. State Key Laboratory for Powder Metallurgy, Central South University,
Changsha 410083, China）
Abstract:A model was established for high strength aluminum alloys to present a nonlinear relation between the fracture toughness of the alloys and the characteristics of constituents, dispersoids, and precipitates within the alloys, based on both the roles of three second-particles with various sized scales in the failure and the dependence of fracture toughness on ductility. The orientation effect of fracture toughness and the detrimental effect of deformation on fracture toughness during processing were also successfully explained for aluminum alloys plates. Moreover, an optimum can be approached to promote the fracture toughness, as well as maintain the strength of the alloys by means of comprehensive analyses to the model.
Key words: aluminum alloys；second-particles with various sized scales； fracture toughness；analytical model
