分别采用直流和脉冲电沉积工艺制各了两种纳米晶铜DC-Cu和PE-Cu,平均晶粒尺寸分别为65nm和33nm.室温单向拉伸试验表明,DC-Cu和PE-Cu的屈服强度分别为332 MPa和545 MPa,基本符合Hall-Petch经验公式;其断裂应变分别为18.2%和3.4%,与粗晶铜相比韧性大幅下降.随着应变速率的升高,两种纳米晶铜均表现出强度增大、韧性降低的规律.DC-Cu和PE-Cu的应变速率敏感系数分别为0.020和0.029,激活体积分别为90b3和36b3.分析认为,两种纳米晶铜的变形机制仍以位错模式为主.
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