Soares Elder, Bouchonneau Nadège, Alves Elizeth, Alves Kleber, Araújo Filho Oscar, Mesguich David, Chevallier Geoffroy, Laurent Christophe, Estournès Claude
Mechanical Engineering Department, Federal University of Pernambuco (UFPE), Av. da Arquitetura, S/N, Recife, PE 50.740-550, Brazil.
CIRIMAT, Université de Toulouse, CNRS, Université Paul-Sabatier, 118 Route de Narbonne, 31062 Toulouse CEDEX 9, France.
Materials (Basel). 2021 Jan 16;14(2):430. doi: 10.3390/ma14020430.
AA7075 aluminum alloy is widely used for several high-technology applications for its high mechanical strength to weight ratio but is still the subject of several studies seeking a further increase in its mechanical properties. A commercial powder is used, either as-received or after ball-milling. Dense AA7075 samples are prepared in one step by Spark Plasma Sintering, at 550 °C with a holding time of 15 min and a uniaxial pressure of 100 MPa. No additional heat treatment is performed. Laser granulometry, X-ray diffraction and optical- and scanning electron microscopy show that both grain size and morphology are preserved in the dense samples, due to the relatively low temperature and short sintering time used. The samples prepared using the ball-milled powder exhibit both higher Vickers microhardness and transverse fracture strength values than those prepared using the raw powder, reflecting the finer microstructure.
AA7075铝合金因其高机械强度重量比而被广泛应用于多种高科技领域，但仍有多项研究致力于进一步提高其机械性能。使用的是商用粉末，要么是原样接收的，要么是球磨后的。通过放电等离子烧结在550℃下一步制备致密的AA7075样品，保温时间为15分钟，单轴压力为100MPa。未进行额外的热处理。激光粒度分析、X射线衍射以及光学和扫描电子显微镜表明，由于烧结温度相对较低且烧结时间较短，致密样品中的晶粒尺寸和形态均得以保留。使用球磨粉末制备的样品比使用原始粉末制备的样品具有更高的维氏显微硬度和横向断裂强度值，这反映了其更精细的微观结构。
