H68黄铜动态应变时效后的组织与性能  

Microstructure and Properties of H68 Brass After Dynamic Strain Aging

作　　者：彭开萍[1] 陈文哲[1] 钱匡武[1] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350002

出　　处：《金属热处理》2006年第2期53-56,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(50441013);福建省教育厅资助项目(JA03015)

摘　　要：在4.76×10-4s-1的应变速率、100K^673K的温度范围内进行了系列温度拉伸试验、恒应力时效试验以及对动态应变时效(DSA)预处理后微观组织的观察,研究了DSA对H68黄铜组织和性能的影响。结果表明,H68黄铜在250K^600K的温度范围内会出现DSA现象;在DSA温区内,出现屈服应力平台及加工硬化速率峰值。在动态应变时效过程中发生的运动位错与溶质原子之间的交互作用使材料的位错组态发生变化,在相同的预应变量下,随着DSA预处理的温度升高,材料的位错密度提高,形成更复杂、更稳定的位错组态。The effects of dynami investigated by tensile test at a c strain aging （DSA） on the microstructure and mechanical properties of H68 brass were strain rate of 4. 76 × 10^-4s^-1 with a temperature range of 100～673K,and constant stress aging test and microstructure observation after DSA pretreatment were carried out also. The results show that the DSA occurs at the temperature of 250 ～600K. A stress platform and a maximum work-hardening rate both occur within the temperature range of DSA. The interaction between the moving dislocation and solute atom during the DSA makes dislocation configuration change. With increasing prestrain temperature, the dislocation density increases and more complex and more stable dislocation structure forms.

关 键 词：动态应变时效 H68黄铜 位错 塑性变形 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG142.1[金属学及工艺—金属学]