欢迎登录材料期刊网

材料期刊网

高级检索

对Cu-0.54%Al2O3弥散强化复合材料的拉伸变形和断裂行为进行了研究.结果表明,经挤压比为30∶1 的热挤压后,复合材料的σb、σ0.2、δ和σ0.2/σb分别高达340 MPa、250 MPa、24%和74%.冷加工后合金的强度随退火温度的升高而逐渐下降,但σ 0.2/σb仍保持较高的值.挤压态合金的加工硬化指数n为0.256,明显低于纯铜.铜基体中均匀弥散分布着平均尺寸为18 nm,间距为100 nm的Al2O3纳米粒子,提高了铜基体的强度,阻碍了高温退火时再结晶的发生,降低了合金的加工硬化速率.挤压态合金的拉伸断口宏观上为杯锥状,微观上表现为明显的韧性断裂特征.

参考文献

[1] Groza J R, Gibeling J C. Principles of particles selection for dispersion strengthened copper[J].Mater Sci Eng Part A, 1993, A171: 115-125.
[2] Nagorka M S, Levi C G, Lucas G E. Novel oxide-dispersion-strengthened copper alloys from rapidly solidified precursors Ⅰ: Microstructural development[J]. Metallurgical and Materials Transactions A, 1995, 26A:859-871.
[3] Bersterci M, Ivan J. The mechanism of the failure of the dispersion-strengthened Cu-Al2O3 system[J]. Journal of Materials Science Letters, 1998, 17:773-776.
[4] Rajkovic V M, Mitkov M V. Dispersion hardened Cu-Al2O3 produced by high energy milling[J]. The International Journal of Powder Metallurgy, 2000, 36(8): 45-49.
[5] 申玉田,崔春翔, 孟凡斌,等. 高强度高导电Cu-Al2O3复合材料的制备[J]. 金属学报,1999,35(8):888-892.
[6] 程建奕,汪明朴,钟卫佳, 等. 内氧化法制备的Cu-Al2O3合金的显微组织与性能[J]. 材料热处理学报,2003, 24(1):24-28.
[7] Srivatsan T S, Troxell J D. Tensile deformation and fracture behavior of a ductile phase reinforced dispersion strengthened copper composite[J]. Journal of Materials Science, 1999, 34: 4859-4866.
[8] Shi Ziyuan, Wang Deqing. Alumina particles in a copper ma-trix formed by aluminizing and internal oxidation[J]. Journal of Materials Science Letters, 1998, 17:477-479.
[9] Baker I, Martin J W. The effect of particle size and spacing on the retardation of recrystallization in two-phase copper crystals[J]. Journal of Materials Science, 1980, 15:1533-1538.
[10] 张吟秋, 雷长明. P/M 铜-氧化铝合金硬化特征的探讨[J]. 中南矿冶学院学报,1987, 18(3): 281-287.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%