本文選題：Cu-Cr-Ti　切入點：原位復(fù)合材料　出處：《江西理工大學(xué)》2015年碩士論文

【摘要】：本文利用中頻感應(yīng)熔煉鑄造及真空感應(yīng)定向凝固鑄造分別制備了Cu-Cr-Ti合金和Cu-Cr-Ti原位復(fù)合材料,并進(jìn)行了冷拔及熱處理,研究Cu-Cr-Ti合金及復(fù)合材料的組織演變規(guī)律、組織熱穩(wěn)定性。通過導(dǎo)電率測試和室溫拉伸試驗等檢測方法,研究了擠壓、固溶處理、冷拔和中間退火及時效處理等對Cu-Cr-Ti合金的抗拉強(qiáng)度、導(dǎo)電性和軟化溫度等性能的影響;采用X射線衍射分析技術(shù)、掃描電子顯微分析方法、能譜分析技術(shù)、金相分析等分析方法,研究了Cu-Cr-Ti合金的組織特征、第二相的形貌和分布以及Cu-Cr-Ti原位復(fù)合材料的定向凝固組織特征、變形組織及熱處理后的熱穩(wěn)定性、相成分、形貌和分布。研究結(jié)果表明:Cu-Cr-Ti合金在拉拔過程中,隨著形變量的增加,縱向晶粒變成纖維狀,橫向組織發(fā)生不規(guī)則變形,抗拉強(qiáng)度增加而導(dǎo)電率下降,退火后抗拉強(qiáng)度降低導(dǎo)電率升高;時效處理后,Cu-0.53Cr-0.11Ti、Cu-0.33Cr-0.05Ti、Cu-0.53Cr-0.05Ti合金在400℃/2h獲得較高導(dǎo)電率和抗拉強(qiáng)度,分別為73.2%IACS和640MPa,83.1%IACS和590MPa,78.6%IACS和623MPa;取合金時效峰值點在470℃~545℃間選擇6個溫度進(jìn)行保溫30min,計算得到Cu-0.53Cr-0.11Ti、Cu-0.33Cr-0.05Ti、Cu-0.53Cr-0.05Ti合金的軟化溫度分別在530℃、545℃、530℃左右,符合接觸線材料軟化溫度要在500℃以上的要求。隨著形變量的增加,Cu-11Cr-0.85Ti定向凝固復(fù)合材料組織發(fā)生明顯變化,表現(xiàn)為縱向組織中Cr相由棒狀逐漸轉(zhuǎn)變?yōu)槔w維狀,橫向組織中Cr相纖維寬厚比增大,呈不規(guī)則彎曲和扭曲;形變Cu-11Cr-0.85Ti定向凝固復(fù)合材料時效后材料局部細(xì)小纖維組織發(fā)生熔斷及球化,并伴有球鏈狀組織,粗大纖維組織沒有發(fā)生明顯的粗化現(xiàn)象,合金縱截面上還可以看到較為完整的纖維組織,纖維較為穩(wěn)定,可見形變Cu-11Cr-0.85Ti原位復(fù)合材料具有優(yōu)良的熱穩(wěn)定性。
[Abstract]:In this paper, Cu-Cr-Ti alloy and Cu-Cr-Ti in-situ composite were prepared by medium frequency induction melting casting and vacuum induction directional solidification casting respectively. The microstructure evolution of Cu-Cr-Ti alloy and composite was studied by cold drawing and heat treatment. The effects of extrusion, solution treatment, cold drawing, intermediate annealing and aging treatment on the tensile strength, electrical conductivity and softening temperature of Cu-Cr-Ti alloy were studied by means of conductivity test and room temperature tensile test. The microstructure of Cu-Cr-Ti alloy was studied by means of X-ray diffraction, scanning electron microscopy, energy spectrum analysis and metallographic analysis. The morphology and distribution of the second phase, the microstructure characteristics of directional solidification of Cu-Cr-Ti in-situ composites, the thermal stability, phase composition, morphology and distribution of the deformed microstructure and heat treatment were also studied. With the increase of shape variables, the longitudinal grain becomes fibrous, the transverse microstructure becomes irregular deformation, the tensile strength increases, the conductivity decreases, and the tensile strength decreases after annealing. After aging treatment, Cu-0.53Cr-0.11TiPCu-0.33Cr-0.05Ti-0.53Cr-0.05Ti alloy obtained high conductivity and tensile strength at 400 鈩，

本文編號：1675643