Scholarlink

<p>To enhance both the mechanical properties and corrosion resistance of 7075 aluminum alloy, a novel cyclic retrogression and re-aging with deep cryogenic treatment (CRRA-DCT) has been proposed. Mechanical properties were evaluated via hardness, tensile, and friction wear tests, while corrosion resistance was assessed through intergranular and electrochemical corrosion tests. Microstructural changes were characterized by TEM. The results indicate that CRRA-DCT partially dissolves the precipitates at high temperature, increasing solute atom concentration in the matrix. Deep cryogenic treatment then lowers the solubility, enhancing precipitate nucleation and inhibiting growth, maintaining a fine precipitate size. After two cycles, CRRA-DCT<sub>2</sub> achieved optimal performance: tensile strength of 619.6&#xa0;MPa, hardness of 207.8&#xa0;HV, and superior wear resistance. Additionally, CRRA-DCT increased precipitate discontinuity at grain boundaries, preventing intergranular corrosion propagation and boosting corrosion resistance. CRRA-DCT<sub>2</sub> exhibited the best corrosion resistance, with an intergranular corrosion depth of 16.26&#xa0;μm, self-corrosion current density of 0.00028&#xa0;mA/cm<sup>2</sup>, and corrosion rate of 0.0092&#xa0;mm/a.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigation into Achieving a Superior Strength and Corrosion Balance in 7075 Aluminium Alloys via Cyclic RRA-DCT

  • 期刊论文

  • 发表日期：

    2026年1月5日

查看全文
  • Kunze Li,
  • Ruiming Su,
  • Guanglong Li

摘要

To enhance both the mechanical properties and corrosion resistance of 7075 aluminum alloy, a novel cyclic retrogression and re-aging with deep cryogenic treatment (CRRA-DCT) has been proposed. Mechanical properties were evaluated via hardness, tensile, and friction wear tests, while corrosion resistance was assessed through intergranular and electrochemical corrosion tests. Microstructural changes were characterized by TEM. The results indicate that CRRA-DCT partially dissolves the precipitates at high temperature, increasing solute atom concentration in the matrix. Deep cryogenic treatment then lowers the solubility, enhancing precipitate nucleation and inhibiting growth, maintaining a fine precipitate size. After two cycles, CRRA-DCT2 achieved optimal performance: tensile strength of 619.6 MPa, hardness of 207.8 HV, and superior wear resistance. Additionally, CRRA-DCT increased precipitate discontinuity at grain boundaries, preventing intergranular corrosion propagation and boosting corrosion resistance. CRRA-DCT2 exhibited the best corrosion resistance, with an intergranular corrosion depth of 16.26 μm, self-corrosion current density of 0.00028 mA/cm2, and corrosion rate of 0.0092 mm/a.