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利用高能高重复频率钕玻璃激光器对7050铝合金进行了冲击强化处理。研究了在激光介质抽运功率保持不变的情况下,通过改变放大自发辐射(ASE)的大小,激光冲击强化7050铝合金,并用X射线衍射技术测量7050铝合金表面产生的残余应力。结果表明,在保持激光介质抽运功率不变的情况下,ASE和铝合金表面产生的残余应力有一定的关系。随着ASE的增大,铝合金表面产生的残余压应力逐渐减小;当ASE增大到16.20 J时,吸收层铝箔已经被完全熔融,有效脉冲直接冲击铝合金表面,在铝合金表面产生21 MPa的拉应力,直接影响激光冲击的强化效果。
The 7050 aluminum alloy was impact strengthened with a high energy and high repetition rate neodymium glass laser. In this paper, the 7050 aluminum alloy with laser shock was strengthened by changing the size of spontaneous emission (ASE) while the pumping power of the laser medium was kept unchanged. The residual stress generated on the surface of 7050 aluminum alloy was measured by X-ray diffraction. The results show that there is a certain relationship between the residual stress generated on the surface of ASE and the aluminum alloy while keeping the pumping power of the laser medium unchanged. With the increase of ASE, the residual compressive stress on the surface of aluminum alloy decreases gradually. When the ASE increases to 16.20J, the aluminum foil in the absorption layer has been completely melted and the effective pulse directly impacts the surface of the aluminum alloy to produce 21 Tensile stress MPa, a direct impact on the laser shock enhancement effect.