本文選題：Cu-Cr-Zr合金 + 高溫變形　； 參考：《天津理工大學(xué)》2017年碩士論文

【摘要】：Cu-Cr-Zr合金是析出強(qiáng)化型高強(qiáng)高導(dǎo)銅合金,廣泛用于微電子工業(yè)中的集成電路引線框架材料、點(diǎn)焊電極、高速電氣化列車接觸導(dǎo)線等領(lǐng)域。眾多研究學(xué)者對(duì)其固溶時(shí)效領(lǐng)域進(jìn)行研究,高溫?zé)嶙冃窝芯枯^少。本文采用Gleeble-1500熱模擬試驗(yàn)機(jī)對(duì)冷軋時(shí)效態(tài)Cu-Cr-Zr合金進(jìn)行高溫壓縮形變?cè)囼?yàn),探究Cu-Cr-Zr合金高溫?zé)嶙冃巫罴鸭庸?shù),討論不同的變形溫度、不同的變形速率與不同的變形量三類因素對(duì)其熱變形行為的影響,觀察總結(jié)熱壓縮實(shí)驗(yàn)對(duì)合金組織性能的影響,利用Cu-Cr-Zr合金形變參數(shù)數(shù)據(jù)庫(kù)建立材料模型,探索采用大型有限元軟件Deform 3D模擬Cu-Cr-Zr合金熱擠壓工藝。形變參數(shù)如下:變形溫度分別為500℃、600℃、700℃、800℃;應(yīng)變速率依次為0.01 s-1、0.1 s-1、1 s-1;變形量為25%、50%。最后獲得Cu-Cr-Zr合金真應(yīng)力-真應(yīng)變曲線,計(jì)算得到變形熱激活能,繪制出熱加工圖,得到安全加工區(qū)域。實(shí)驗(yàn)結(jié)果表明當(dāng)變形量一定時(shí),Cu-Cr-Zr合金的流變應(yīng)力隨著變形溫度的升高而降低,Cu-Cr-Zr合金高溫的熱激活能為Q=600.2 kJ/mol,求出流變應(yīng)力本構(gòu)方程,安全加工參數(shù):變形溫度在700℃-800℃之間,變形速率控制在0.1 s-1左右。Cu-Cr-Zr合金高溫形變?cè)嚇咏M織分析表明,在變形溫度500℃范圍內(nèi),動(dòng)態(tài)回復(fù)機(jī)制起主要作用;在變形溫度600℃-800℃范圍內(nèi),動(dòng)態(tài)再結(jié)晶占主導(dǎo)作用;Cu-Cr-Zr合金的變形溫度的升高,對(duì)應(yīng)銅合金的晶粒度降低;銅合金熱變形的應(yīng)變速率增加,Cu-Cr-Zr合金的晶粒度升高,銅合金的變形量越大,其對(duì)應(yīng)的晶粒度越高;硬度值隨變形溫度的升高而降低,這是因?yàn)橛蓜?dòng)態(tài)回復(fù)轉(zhuǎn)變?yōu)閯?dòng)態(tài)再結(jié)晶。經(jīng)過(guò)熱變形后,合金析出相為Cr單質(zhì),隨著變形速率的增加,析出相Cr單質(zhì)的含量逐漸降低。在動(dòng)態(tài)回復(fù)轉(zhuǎn)變?yōu)閯?dòng)態(tài)再結(jié)晶過(guò)程中,硬度值隨變形溫度的升高而降低。在Deform 3D軟件的數(shù)據(jù)庫(kù)中建立與本實(shí)驗(yàn)相關(guān)的500℃-800℃Cu-Cr-Zr合金材料數(shù)據(jù)庫(kù),選擇合適的Cu-Cr-Zr合金對(duì)應(yīng)的應(yīng)力、應(yīng)變函數(shù)方程以及Cu-Cr-Zr合金熱變形本構(gòu)方程,將其整理導(dǎo)入到材料數(shù)據(jù)庫(kù)中,分析得到Cu-Cr-Zr合金熱擠壓工藝參數(shù),以便于合理地在實(shí)際生產(chǎn)中控制好擠壓溫度與擠壓速度。
[Abstract]:Cu-Cr-Zr alloy is a kind of high strength and high conductivity copper alloy, which is widely used in microelectronics industry, such as integrated circuit lead frame material, spot welding electrode, high speed electrified train contact wire and so on. Many researchers have studied the field of solid solution aging, but the hot deformation at high temperature is less. In this paper, the high temperature compression deformation test of cold rolled aged Cu-Cr-Zr alloy was carried out by using Gleeble-1500 thermal simulation machine, the optimum processing parameters of high temperature thermal deformation of Cu-Cr-Zr alloy were investigated, and different deformation temperatures were discussed. The influence of three kinds of factors, different deformation rate and different deformation quantity, on the thermal deformation behavior of the alloy was studied. The effect of thermal compression test on the microstructure and properties of the alloy was observed and summarized, and the material model was established by using the Cu-Cr-Zr deformation parameter database. A large finite element software Deform 3D was used to simulate the hot extrusion process of Cu-Cr-Zr alloy. The deformation parameters are as follows: the deformation temperature is 500 鈩，

本文編號(hào)：1890228