摘要
在不同温度下,对W70Cu30合金坯采用多道次热轧试验。结果表明,在700℃时,多道次热轧可以获得板厚为0.2mm,相对密度达99.92%的W-Cu合金薄板。轧制过程中,合金板材中Cu相和W相在轧制应力作用下发生变形、滑动,Cu相均匀填充在W颗粒周围,形成了致密的网络状组织,使电导率、热导率较轧制前分别提高了23%和31.31%。同时板材致密度提高和形变强化,使其显微硬度较轧制前也大幅提高。在轧制变形过程中,W-Cu合金板材的物相组成没有发生变化,仅由W和Cu两相组成。轧制后W70Cu30合金板材的断裂方式由粘结相Cu的韧性断裂和W颗粒的穿晶断裂组成。
Commercial W70Cu30 alloy was hot-rolled by multi-pass hot-rolling at different temperatures. The properties of the W70Cu30 sheet were analyzed. The results indicate that W-Cu alloy sheets with 0. 2 mm in thickness and relative density of 99.92 % can be prepared successfully by the newly technique at 700 ℃. In hot-rolling process, deformation and sliding in both copper and tungsten phases occur as a result of rolling stress, which makes copper phase fill in closely surrounded by tungsten particles to form network-like distribution structure, increasing electrical and thermal conductivity by 23% and 31.31% after hot-rolling, respectively. Induced density and deformation strength also enhance micro-hardness of W70Cu30 alloy sheets. The sheets after hot-rolling consist of two phases-W and Cu. In addition, the fracture mode of the sheet after hot-rolling is characterized by ductile fracture of copper binding phase and trans-granular fracture of tungsten phase.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2013年第1期90-93,共4页
Special Casting & Nonferrous Alloys
基金
陕西省教育厅自然科学基金项目(11JK0813)
关键词
热轧
W-Cu合金
断口形貌
板材
Hot-Rolling
W-Cu Alloy
Fracture Morphology
Sheet
