本文選題：AlFeCrCoNi高熵合金　切入點(diǎn)：銅基復(fù)合材料　出處：《西安工業(yè)大學(xué)》2015年碩士論文

【摘要】：銅基復(fù)合材料廣泛應(yīng)用于航空、航天、軍事及火箭發(fā)動(dòng)機(jī)等領(lǐng)域,而高熵合金是最近發(fā)展起來(lái)的具有高強(qiáng)度、高硬度及耐高溫穩(wěn)定性能的一種新型合金。為了了解高熵合金/Cu復(fù)合材料的性能,本文采用電弧熔煉法和機(jī)械合金化法制備AlFeCrCoNi高熵合金強(qiáng)化相,采用粉末冶金法制備高熵合金/Cu復(fù)合材料。借助金相顯微鏡、掃描電鏡、硬度測(cè)試以及壓縮試驗(yàn)等,研究了高熵合金制粉工藝及燒結(jié)工藝對(duì)高熵合金/Cu復(fù)合材料組織與性能的影響,得出主要結(jié)論如下：球料比為10：1,轉(zhuǎn)速為300r/min,真空氬氣氛保護(hù)不銹鋼球磨罐內(nèi),正庚烷作為過(guò)程控制劑,球磨18h后,形成BCC體系的AlFeCrCoNi高熵合金,其晶粒尺寸為58A。對(duì)其800℃退火1h、1.5h和2h后隨爐冷卻發(fā)現(xiàn),退火保溫時(shí)間對(duì)合金的晶體結(jié)構(gòu)和物相沒(méi)有影響。通過(guò)電弧熔煉法制備的AlFeCrCoNi高熵合金,晶格常數(shù)為a=b=c=2.877,熔點(diǎn)為1384.3℃,壓縮屈服強(qiáng)度為1290MPa,壓縮斷裂強(qiáng)度為2310MPa,斷口形貌為解理臺(tái)階和河流花樣,斷裂機(jī)理為解理斷裂。800℃退火后形成了BCC1相、BCC2相和HCP相。隨著AlFeCrCoNi高熵合金強(qiáng)化相含量的增加,Cu基復(fù)合材料的致密度降低,電導(dǎo)率降低,硬度增大,抗壓強(qiáng)度先增大后減小。隨著燒結(jié)溫度、燒結(jié)壓強(qiáng)的增加,Cu基復(fù)合材料的致密度、硬度、抗壓強(qiáng)度均增加,但電導(dǎo)率卻有所下降。用350r/min的速度球磨74h(轉(zhuǎn)12min停6min)所制備的高熵合金通過(guò)細(xì)小粒度選擇后作為強(qiáng)化相,強(qiáng)化相20%的復(fù)合材料冷壓150KN保壓6min,熱壓燒結(jié)在973K、100MPa時(shí)保溫保壓2h后,其綜合性能最優(yōu)。電弧熔煉法制備的AlFeCrCoNi高熵合金,線切割成薄片之后,球料比為40：1,轉(zhuǎn)速為400 r/min,球磨20h時(shí)制備成1-5μm的細(xì)小顆粒。以其為強(qiáng)化相,制備Cu-20wt.%AlFeCrCoNi復(fù)合材料,在973K,100MPa燒結(jié)1h后水冷,其壓縮屈服強(qiáng)度為310 MPa,與純銅相比增加了1.38倍,同時(shí)壓縮率達(dá)到了60%以上。
[Abstract]:Copper matrix composites are widely used in aviation, aerospace, military and rocket engines, and high-entropy alloys have recently been developed with high strength. In order to understand the properties of high entropy alloy / Cu composite, AlFeCrCoNi high entropy alloy strengthened phase was prepared by arc melting and mechanical alloying. High entropy alloy / Cu composites were prepared by powder metallurgy method. Metallographic microscope, scanning electron microscope, hardness test and compression test were used. The effect of high entropy alloy powder making process and sintering process on the microstructure and properties of high entropy alloy / Cu composite was studied. The main conclusions are as follows: the ratio of ball to material is 10: 1, the rotational speed is 300 r / min, and the vacuum argon atmosphere protects the stainless steel ball mill tank. AlFeCrCoNi high entropy alloy of BCC system was formed after 18h ball milling of n-heptane as process control agent, and its grain size was 58A. annealing at 800 鈩，

本文編號(hào)：1671921