Girgis Abram, Samuel Ehab, Samuel Agnes M, Songmene Victor, Samuel Fawzy H
Département des Sciences Appliquées, Université du Québec à Chicoutimi Québec, Chicoutimi, QC G7H 2B1, Canada.
Department of Mechanical Engineering, École de Technologie Supérieure (ÉTS), Montréal, QC H3C 1K3, Canada.
Materials (Basel). 2023 Feb 7;16(4):1400. doi: 10.3390/ma16041400.
The present work was performed on three versions of a newly developed alloy coded T200 containing 6.5% Cu, 0.1% Fe, 0.45% Mg, and 0.18% Zr in addition to A319 and A356 alloys (grain refined and Sr-modified). Tensile bars were subjected to 13 different heat treatments prior to testing at either 25 °C or 250 °C. The tensile data were analyzed using the quality index method. The results obtained showed that, due to the high copper content in the T200 alloy coupled with proper grain refining, the alloy possesses the highest quality as well as improved resistance to softening when tested at 250 °C among the five alloys. The results also demonstrate the best heat treatment condition to maximize the use of the T200 alloy for automotive applications. Grain-refined alloy B, treated in the T6 temper and tested at 250 °C, exhibited the best combination of the four tensile parameters, i.e., UTS, YS, %El, and Q-values: 308 MPa, 304 MPa, 2.3%, and 352 MPa, respectively, which are comparable with those obtained from the 356 alloy: 309 MPa, 305 MPa, 2.8%, and 375 MPa in the same order.
本研究针对新开发的编号为T200的合金的三个版本开展，该合金除含有6.5%的铜、0.1%的铁、0.45%的镁和0.18%的锆外，还含有A319和A356合金（晶粒细化并经锶变质处理）。拉伸试棒在25℃或250℃进行测试前，先进行了13种不同的热处理。使用质量指数法对拉伸数据进行了分析。所得结果表明，由于T200合金中铜含量高且晶粒细化得当，该合金在这五种合金中，于250℃测试时具有最高的质量以及更好的抗软化性能。结果还表明了使T200合金在汽车应用中得到最大程度利用的最佳热处理条件。在T6回火状态下处理并在250℃测试的晶粒细化合金B，在四个拉伸参数，即抗拉强度（UTS）、屈服强度（YS）、伸长率（%El）和Q值方面表现出最佳组合，分别为308兆帕、304兆帕、2.3%和352兆帕，与356合金在相同参数下得到的结果（309兆帕、305兆帕、2.8%和375兆帕）相当。
