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锶变质及热处理对ADC12合金显微组织及力学性能的影响

机译:锶变质及热处理对ADC12合金显微组织及力学性能的影响

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The effects of heat treatment and strontium (Sr) addition on the microstructure and mechanical properties of ADC12 alloys were investigated, and two-stage solution treatment was introduced. The results indicated that the addition of Sr obviously refined the microstructure of ADC12 alloys. When 0.05 wt% Sr was added into the alloy, the eutectic Si phase was fully modified into fine fibrous structure; α-Al and β-Al5FeSi phases were best refined; and the eutectic Al2Cu phase was modified into block-like Al2Cu phase that continuously distributed at the grain boundary. The ultimate tensile strength (UTS) (270.63 MPa) and elongation (3.19%) were increased by 51.2% and 73.4% respectively compared with unmodified alloys. After the two-stage solution treatment (500 °C, 6 h+520 °C, 4 h), for 0.05 wt% Sr modified ADC12 alloys, the Si phases transformed into fine particle structure and Al2Cu phases were fully dissolved. The peak hardness value of the alloys processed by the two-stage solution treatment was increased by 8.3% and 6.8% respectively compared to solution treatment at 500 °C and 520 °C. After the aging treatment (175 °C, 7 h), the hardness and UTS were increased by 38.73% and 13.96% respectively when compared with the unmodified alloy.%本文研究了锶(Sr)变质、单级及二级固溶处理以及时效处理对 ADC12 合金显微组织及力学性能的影响.结果表明,Sr的添加可以显著改善ADC12合金的显微组织.当Sr添加量为0.05 wt%时,共晶硅相完全转变为细小纤维状,α-Al相和β-Al5FeSi相得到了较佳的细化效果,同时Al2Cu相转变为块状,并连续分布在晶界处;其极限抗拉强度(270.63 MPa)和伸长率(3.19%)较基体合金分别提高了51.2%和73.4%.经二级固溶处理(500 °C,6 h+520 °C,4 h)后,共晶硅相转变为细小颗粒状,Al2Cu相完全溶解;其峰值硬度较 500 °C 和 520 °C 下单级固溶处理分别提高了 8.3%和 6.8%.时效处理(175 °C,7 h)后,其硬度和极限抗拉强度较基体合金分别提高了38.73%和13.96%.
机译:研究了热处理和锶(SR)对ADC12合金的微观结构和力学性能的影响,并引入了两级溶液处理。结果表明,SR的添加显然精制ADC12合金的微观结构。将0.05wt%Sr加入合金时,将共晶Si相完全改性为细纤维结构; α-Al和β-Al5Fesi阶段最佳精制;并将共晶Al 2Cu相改变成嵌段的Al 2Cu相,其连续分布在晶界处。与未修浆合金相比,最终拉伸强度(UTS)(270.63MPa)和伸长率分别增加了51.2%和73.4%。在两级溶液处理(500℃,6h + 520℃,4小时)后,对于0.05wt%SR改性的AdC12合金,将Si相变为细颗粒结构和Al2Cu相完全溶解。与溶液处理在500℃和520℃下,通过两级溶液处理处理的合金的峰值硬度值分别增加了8.3%和6.8%。在衰老处理(175℃,7小时)后,与未修饰的合金相比,硬度和UT分别增加了38.73%和13.96%。%本文研究了锶(SR)变质,单位及二级固溶管理时以及时代效adc12合金显微及组织表明,sr的附加的影响adc12合金的显微组织。当sr添增加为0.05 wt%时,共晶硅相完全转变为单小纤维状,α-al相和β-al5fesi相得得到了到较细细ーー细,同时al2cu相转变为之,并连续分布在晶界处;其其只有限制拉拉强度(270.63 MPa)和伸长率( 3.19%)较基体合金分子分别高于51.2%和73.4%。经经二级致原因(500°C,6 h + 520°C,4 h)后,共晶硅相转变为细小颗粒状,al2cu相完全溶解;其其硬度较500°C和520°C ock andigants提高于8.3%和6.8%。时尚致原理(175°C,7 h)后,其硬度和极限均拉强度强度基体合金分量提高于38.73%和13.96%。

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