本研究是以超音波縱波音速及衰減係數評估6061-T651鋁合金經過冷滾軋加工後材料之機械性質。其目的是在建立以超音波非破壞檢測的方式，來評估材料經冷加工過後的彈性係數及硬度等性質，並探討超音波在材料中的特性與材料機械性質的關係。經由實驗結果得知，在6061-T651鋁合金經過冷加工後，超音波縱波音速及衰減係數會隨著冷作率的增加而減少，超音波縱波音速會隨著材料彈性係數的增加而減小，會隨著蒲松氏比的增加而提高。材料硬度亦會隨著超音波縱波音速及衰減係數增加而減小。在以超音波縱波音速及衰減係數評估6061- T651鋁合金材料時，以超音波縱波音速評估材料機械性質較為精確，而以超音波衰減係數評估材料機械性質離散性較高，因此在檢測效率上以超音波縱波音速來評估機械性質較佳。 ABSTRACT In this research, the mechanical properties of the material, which is processed after the cold rolling of 6061-T651 aluminum alloys, are evaluated by ultrasonic longitudinal wave velocity and attenuation coefficient .The purpose is to establish the estimation of elastic modulus and hardness after cold working through ultrasonic nondestructive testing and to discuss the relations between ultrasonic characteristics and mechanical properties in the 6061-T651 aluminum alloy. The results reveal that the ultrasonic longitudinal wave velocity and attenuation coefficient vary inversely with cold working rate and that longitudinal wave velocity decreases with increasing elastic modulus and increases with increasing Poisson’s ratio. Hardness of alloy decreases when longitudinal wave velocity and attenuation coefficient increase. The mechanical properties can be measured more accurately by ultrasonic longitudinal wave velocity than by attenuation coefficient when 6061-T651 aluminum alloy is evaluated. Besides, the estimation of mechanical properties is more dispersed through ultrasonic attenuation coefficient. In conclusion, ultrasonic longitudinal wave velocity has the higher testing efficiency in measuring the mechanical properties.

In this research, the mechanical properties of the material, which is
processed after the cold rolling of 6061-T651 aluminum alloys, are evaluated
by ultrasonic longitudinal wave velocity and attenuation coefficient .The
purpose is to establish the estimation of elastic modulus and hardness after
cold working through ultrasonic nondestructive testing and to discuss the
relations between ultrasonic characteristics and mechanical properties in the
6061-T651 aluminum alloy.
　　The results reveal that the ultrasonic longitudinal wave velocity and
attenuation coefficient vary inversely with cold working rate and that
longitudinal wave velocity decreases with increasing elastic modulus and
increases with increasing Poisson’s ratio. Hardness of alloy decreases when
longitudinal wave velocity and attenuation coefficient increase.
　　The mechanical properties can be measured more accurately by ultrasonic
longitudinal wave velocity than by attenuation coefficient when 6061-T651
aluminum alloy is evaluated. Besides, the estimation of mechanical properties
is more dispersed through ultrasonic attenuation coefficient. In conclusion,
ultrasonic longitudinal wave velocity has the higher testing efficiency in
measuring the mechanical properties.

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