测量了Sn-3.8Ag-0.7Cu无铅焊料试样的循环滞后回线、循环应力响应曲线、循环应力-应变和应变寿命关系,研究了焊料在总应变幅控制下的低周疲劳行为结果表明:该焊料合金在总应变幅较高(1%)时发生连续的循环软化,而在总应变幅较低(≤0.4%)时则表现为循环稳定.线性回归分析表明,该焊料的低周疲劳寿命满足Coffin-Manson经验关系式,由此给出了焊料在室温下的低周疲劳参数.采用扫描电镜观测和分析了焊料在疲劳前后的组织特征.
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